ASP.NET MVC – Custom model binders por propiedad

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ASP.NET MVC – Custom model binders por propiedad

📅 Oct 16, 2013 · ☕ 12 min · ✍️ eiximenis

Nota: Este post ha sido importado de mi blog de geeks.ms. Es posible que algo no se vea del todo "correctamente". En cualquier caso puedes acceder a la versión original aquí

Muy buenas! En este post vamos a ver como habilitar un custom model binder para una propiedad en concreto de un viewmodel.

De serie es posible configurar un Custom Model Binder de dos maneras:

Añadiéndolo a la colección Binders de la clase ModelBinders. Con esto conseguimos que todos los valores de un tipo concreto se enlacen usando nuestro ModelBinder.
Usando el atributo [ModelBinder]. Con este atributo podemos especificar un Model Binder a usar para un viewmodel en concreto o para un parámetro en concreto de un controlador. Pero desgraciadamente no para una propiedad concreta de un viewmodel:

Por suerte conseguir usar un custom model binder para una propiedad en concreto de un viewmodel no es tan complicado 🙂

Lo primero es crearnos un atributo propio ya que el ModelBinderAttribute no podemos usarlo, así que vamos a ello:

Atributo [PropertyModelBinder]

<div style="background: #ddd; max-height: 300px; overflow: auto">
  <ol start="1" style="background: #1e1e1e; margin: 0 0 0 2.5em; padding: 0 0 0 5px; white-space: nowrap">
    <li>
      <span style="background:#1e1e1e;color:#4ec9b0">AttributeUsage</span><span style="background:#1e1e1e;color:#dcdcdc">(</span><span style="background:#1e1e1e;color:#b8d7a3">AttributeTargets</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Property)]</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#569cd6">public</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">class</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">PropertyModelBinderAttribute</span><span style="background:#1e1e1e;color:#dcdcdc"> : </span><span style="background:#1e1e1e;color:#4ec9b0">CustomModelBinderAttribute</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">private</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">readonly</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">Type</span><span style="background:#1e1e1e;color:#dcdcdc"> _typeToUse;</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">public</span><span style="background:#1e1e1e;color:#dcdcdc"> PropertyModelBinderAttribute(</span><span style="background:#1e1e1e;color:#4ec9b0">Type</span><span style="background:#1e1e1e;color:#dcdcdc"> typeToUse)</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            _typeToUse </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> typeToUse;</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        }</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">public</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">override</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#b8d7a3">IModelBinder</span><span style="background:#1e1e1e;color:#dcdcdc"> GetBinder()</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> binder </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">DependencyResolver</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Current</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">GetService(_typeToUse) </span><span style="background:#1e1e1e;color:#569cd6">as</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#b8d7a3">IModelBinder</span><span style="background:#1e1e1e;color:#dcdcdc">;</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">return</span><span style="background:#1e1e1e;color:#dcdcdc"> binder </span><span style="background:#1e1e1e;color:#b4b4b4">??</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">new</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">DefaultModelBinder</span><span style="background:#1e1e1e;color:#dcdcdc">();</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        }</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    }</span>
    </li>
  </ol>
</div></p>

Una vez lo tenemos creado, lo aplicamos a nuestro viewmodel:

ViewModel de prueba

<div style="background: #ddd; max-height: 300px; overflow: auto">
  <ol start="1" style="background: #1e1e1e; margin: 0 0 0 2em; padding: 0 0 0 5px; white-space: nowrap">
    <li>
      <span style="background:#1e1e1e;color:#569cd6">public</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">class</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">SomeViewModel</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">{</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    [</span><span style="background:#1e1e1e;color:#4ec9b0">PropertyModelBinder</span><span style="background:#1e1e1e;color:#dcdcdc">(</span><span style="background:#1e1e1e;color:#569cd6">typeof</span><span style="background:#1e1e1e;color:#dcdcdc">(</span><span style="background:#1e1e1e;color:#4ec9b0">RomanNumberModelBinder</span><span style="background:#1e1e1e;color:#dcdcdc">))]</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    [</span><span style="background:#1e1e1e;color:#4ec9b0">Range</span><span style="background

:#1e1e1e;color:#dcdcdc">(1,21)]

public int Century { get; set; }

public string Name { get; set; }

}

Ahora debemos implementar el custom model binder. En este caso he implementado un model binder que convierte cadenas en formato de número romano (tal como XX o VIII) al entero correspondiente.

Nota: El código de conversión lo he sacado de http://vadivel.blogspot.com.es/2011/09/how-to-convert-roman-numerals-to.html. Tan solo lo he corregido para usar un SortedDictionary y así asegurarme de que el orden por el que se itera sobre las claves es el esperado (en un Dictionary<,> el orden de iteración no está definido).

El código entero de mi ModelBinder es el siguiente:

RomanNumberModelBinder

<div style="background: #ddd; max-height: 300px; overflow: auto">
  <ol start="1" style="background: #1e1e1e; margin: 0 0 0 2.5em; padding: 0 0 0 5px; white-space: nowrap">
    <li>
      <span style="background:#1e1e1e;color:#569cd6">public</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">class</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">RomanNumberModelBinder</span><span style="background:#1e1e1e;color:#dcdcdc"> : </span><span style="background:#1e1e1e;color:#b8d7a3">IModelBinder</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">{</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#569cd6">private</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">static</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">List</span><span style="background:#1e1e1e;color:#b4b4b4"><</span><span style="background:#1e1e1e;color:#569cd6">string</span><span style="background:#1e1e1e;color:#b4b4b4">></span><span style="background:#1e1e1e;color:#dcdcdc"> _romanTokens </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">new</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">List</span><span style="background:#1e1e1e;color:#b4b4b4"><</span><span style="background:#1e1e1e;color:#569cd6">string</span><span style="background:#1e1e1e;color:#b4b4b4">></span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#d69d85">"M"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"CM"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"D"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"CD"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"C"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"XC"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"L"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"XL"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"X"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"IX"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"V"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"IV"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span><span style="background:#1e1e1e;color:#d69d85">"I"</span><span style="background:#1e1e1e;color:#dcdcdc">,</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    };</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#569cd6">private</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">class</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">RomanKeyComparer</span><span style="background:#1e1e1e;color:#dcdcdc"> : </span><span style="background:#1e1e1e;color:#b8d7a3">IComparer</span><span style="background:#1e1e1e;color:#b4b4b4"><</span><span style="background:#1e1e1e;color:#569cd6">string</span><span style="background:#1e1e1e;color:#b4b4b4">></span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">public</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">int</span><span style="background:#1e1e1e;color:#dcdcdc"> Compare(</span><span style="background:#1e1e1e;color:#569cd6">string</span><span style="background:#1e1e1e;color:#dcdcdc"> x, </span><span style="background:#1e1e1e;color:#569cd6">string</span><span style="background:#1e1e1e;color:#dcdcdc"> y)</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        {</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> idx </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> _romanTokens</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">IndexOf(x);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            </span><br /> <span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> idx2 </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> _romanTokens</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">IndexOf(y);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">if</span><span style="background:#1e1e1e;color:#dcdcdc"> (idx </span><span style="background:#1e1e1e;color:#b4b4b4">==</span><span style="background:#1e1e1e;color:#dcdcdc"> idx2) </span><span style="background:#1e1e1e;color:#569cd6">return</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#b5cea8"></span><span style="background:#1e1e1e;color:#dcdcdc">;</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">return</span><span style="background:#1e1e1e;color:#dcdcdc"> idx </span><span style="background:#1e1e1e;color:#b4b4b4"><</span><span style="background:#1e1e1e;color:#dcdcdc"> idx2 </span><span style="background:#1e1e1e;color:#b4b4b4">?</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#b4b4b4">&#8211;</span><span style="background:#1e1e1e;color:#b5cea8">1</span><span style="background:#1e1e1e;color:#dcdcdc"> : </span><span style="background:#1e1e1e;color:#b5cea8">1</span><span style="background:#1e1e1e;color:#dcdcdc">;</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        }</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    }</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#569cd6">private</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">static</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">SortedDictionary</span><span style="background:#1e1e1e;color:#b4b4b4"><</span><span style="background:#1e1e1e;color:#569cd6">string</span><span style="background:#1e1e1e;color:#dcdcdc">, </span><span style="background:#1e1e1e;color:#569cd6">int</span><span style="background:#1e1e1e;color:#b4b4b4">></span><span style="background:#1e1e1e;color:#dcdcdc"> RomanNumbers </span><span style="background:#1e1e1e;color:#b4b4b4">=</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">new</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">SortedDictionary</span><span style="background:#1e1e1e;color:#b4b4b4"><</span><span style="background:#1e1e1e;color:#569cd6">string</span><span style="background:#1e1e1e;color:#dcdcdc">, </span><span style="background:#1e1e1e;color:#569cd6">int</span><span style="background:#1e1e1e;color:#b4b4b4">></span><span style="background:#1e1e1e;color:#dcdcdc">(</span><span style="background:#1e1e1e;color:#569cd6">new</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">RomanKeyComparer</span><span style="background:#1e1e1e;color:#dcdcdc">());</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#569cd6">public</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">object</span><span style="background:#1e1e1e;color:#dcdcdc"> BindModel(</span><span style="background:#1e1e1e;color:#4ec9b0">ControllerContext</span><span style="background:#1e1e1e;color:#dcdcdc"> controllerContext, </span><span style="background:#1e1e1e;color:#4ec9b0">ModelBindingContext</span><span style="background:#1e1e1e;color:#dcdcdc"> bindingContext)</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">if</span><span style="background:#1e1e1e;color:#dcdcdc"> (bindingContext</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ModelType </span><span style="background:#1e1e1e;color:#b4b4b4">!=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">typeof</span><span style="background:#1e1e1e;color:#dcdcdc"> (</span><span style="background:#1e1e1e;color:#569cd6">int</span><span style="background:#1e1e1e;color:#dcdcdc">)) </span><span style="background:#1e1e1e;color:#569cd6">return</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">null</span><span style="background:#1e1e1e;color:#dcdcdc">;</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> value </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> bindingContext</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ValueProvider</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">GetValue(bindingContext</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ModelName)</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">AttemptedValue;</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">return</span><span style="background:#1e1e1e;color:#dcdcdc"> RomanToInt(value);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    }</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#569cd6">private</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">static</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">int</span><span style="background:#1e1e1e;color:#dcdcdc"> RomanToInt(</span><span style="background:#1e1e1e;color:#569cd6">string</span><span style="background:#1e1e1e;color:#dcdcdc"> roman)</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">    {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">if</span><span style="background:#1e1e1e;color:#dcdcdc"> (</span><span style="background:#1e1e1e;color:#b4b4b4">!</span><span style="background:#1e1e1e;color:#dcdcdc">RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Any())</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8"></span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">1000</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">1</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">900</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">2</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">500</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">3</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">400</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">4</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">100</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">5</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">90</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">6</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">50</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">7</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">40</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">8</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">10</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">9</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">9</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">10</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">5</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">11</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">4</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            RomanNumbers</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Add(_romanTokens[</span><span style="background:#1e1e1e;color:#b5cea8">12</span><span style="background:#1e1e1e;color:#dcdcdc">], </span><span style="background:#1e1e1e;color:#b5cea8">1</span><span style="background:#1e1e1e;color:#dcdcdc">);</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        }</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">int</span><span style="background:#1e1e1e;color:#dcdcdc"> result </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#b5cea8"></span><span style="background:#1e1e1e;color:#dcdcdc">;</span>
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      &nbsp;
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">foreach</span><span style="background:#1e1e1e;color:#dcdcdc"> (</span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> pair </span><span style="background:#1e1e1e;color:#569cd6">in</span><span style="background:#1e1e1e;color:#dcdcdc"> RomanNumbers)</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">        {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">while</span><span style="background:#1e1e1e;color:#dcdcdc"> (roman</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">IndexOf(pair</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Key</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ToString()) </span><span style="background:#1e1e1e;color:#b4b4b4">==</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#b5cea8"></span><span style="background:#1e1e1e;color:#dcdcdc">)</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">            {</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">                result </span><span style="background:#1e1e1e;color:#b4b4b4">+=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">int</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Parse(pair</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Value</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ToString());</span>
    </li>
    <li>
      <span style="background:#1e1e1e;color:#dcdcdc">                roman </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> roman</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Substring(pair</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Key</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ToString()</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Length);</span>
    </li>
    <p>
      <l i><span style="background:#1e1e1e;color:#dcdcdc">            }</span></li> 
      
      <li>
        <span style="background:#1e1e1e;color:#dcdcdc">        }</span>
      </li>
      <li>
        <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">return</span><span style="background:#1e1e1e;color:#dcdcdc"> result;</span>
      </li>
      <li>
        <span style="background:#1e1e1e;color:#dcdcdc">    }</span>
      </li>
      <li>
        <span style="background:#1e1e1e;color:#dcdcdc">}</span>
      </li></ol></div>
    </p></div> </p></div> 
    
    <p>
      Teóricamente lo tenemos todo montado. Pero si lo probamos veremos que NO funciona. Para la prueba me he generado una pequeña vista como la siguiente:
    </p>
    
    <div id="scid:9ce6104f-a9aa-4a17-a79f-3a39532ebf7c:12d51033-3cb5-40ec-a6ae-96e71d7585ef" class="wlWriterEditableSmartContent" style="float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px">
      <div style="border: #000080 1px solid; color: #000; font-family: 'Courier New', Courier, Monospace; font-size: 10pt">
        <div style="background: #000080; color: #fff; font-family: Verdana, Tahoma, Arial, sans-serif; font-weight: bold; padding: 2px 5px">
          Vista de prueba
        </div>
        
        <div style="background: #ddd; max-height: 300px; overflow: auto">
          <ol start="1" style="background: #1e1e1e; margin: 0 0 0 2.5em; padding: 0 0 0 5px; white-space: nowrap">
            <li>
              <span style="background:#ffffb3;color:#000000">@model </span><span style="background:#1e1e1e;color:#dcdcdc">WebApplication1</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Models</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#4ec9b0">SomeViewModel</span>
            </li>
            <li>
              &nbsp;
            </li>
            <li>
              <span style="background:#ffffb3;color:#000000">@</span><span style="background:#1e1e1e;color:#569cd6">using</span><span style="background:#1e1e1e;color:#dcdcdc"> (Html</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">BeginForm())</span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">{</span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#808080"><</span><span style="background:#1e1e1e;color:#569cd6">p</span><span style="background:#1e1e1e;color:#808080">></span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#ffffb3;color:#000000">@</span><span style="background:#1e1e1e;color:#dcdcdc">Html</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">LabelFor(m </span><span style="background:#1e1e1e;color:#b4b4b4">=></span><span style="background:#1e1e1e;color:#dcdcdc"> m</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Name)</span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#ffffb3;color:#000000">@</span><span style="background:#1e1e1e;color:#dcdcdc">Html</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">EditorFor(m </span><span style="background:#1e1e1e;color:#b4b4b4">=></span><span style="background:#1e1e1e;color:#dcdcdc"> m</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Name)</span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#808080"></</span><span style="background:#1e1e1e;color:#569cd6">p</span><span style="background:#1e1e1e;color:#808080">></span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#808080"><</span><span style="background:#1e1e1e;color:#569cd6">p</span><span style="background:#1e1e1e;color:#808080">></span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#ffffb3;color:#000000">@</span><span style="background:#1e1e1e;color:#dcdcdc">Html</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">LabelFor(m </span><span style="background:#1e1e1e;color:#b4b4b4">=></span><span style="background:#1e1e1e;color:#dcdcdc"> m</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Century)</span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#ffffb3;color:#000000">@</span><span style="background:#1e1e1e;color:#dcdcdc">Html</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">TextBoxFor(m </span><span style="background:#1e1e1e;color:#b4b4b4">=></span><span style="background:#1e1e1e;color:#dcdcdc"> m</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Century, </span><span style="background:#1e1e1e;color:#569cd6">new</span><span style="background:#1e1e1e;color:#dcdcdc"> {placeholder </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#d69d85">"In Romna numbers, like XX or XIX"}</span><span style="background:#1e1e1e;color:#dcdcdc">)</span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#808080"></</span><span style="background:#1e1e1e;color:#569cd6">p</span><span style="background:#1e1e1e;color:#808080">></span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">    </span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#808080"><</span><span style="background:#1e1e1e;color:#569cd6">input</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#9cdcfe">type</span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#c8c8c8">"submit"</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#9cdcfe">value</span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#c8c8c8">"send"</span><span style="background:#1e1e1e;color:#808080">/></span>
            </li>
            <li>
              <span style="background:#1e1e1e;color:#dcdcdc">}</span>
            </li>
          </ol>
        </div></p>
      </div></p>
    </div>
    
    <p>
      Y luego las acciones correspondientes en el controlador para mostrar la vista y recibir los resultados. Si lo probáis veréis que nuestro RomanNumberModelBinder no se invoca 🙁
    </p>
    
    <p>
      El “culpable” de que no funcione es el ModelBinder por defecto (DefaultModelBinder). Dado que el atributo [ModelBinder] origina <strong>no</strong> puede aplicarse a propiedades, el DefaultModelBinder no tiene en cuenta la posibilidad de que una propiedad en concreto use un model binder distinto. Así pues nos toca reescribir parte del DefaultModelBinder.
    </p>
    
    <p>
      Para reescribir parte del ModelBinder lo más sencillo es heredar de él y redefinir el método que necesitemos. En este caso el método necesario es BindProperty que enlaza una propiedad. Veamos como queda el código:
    </p>
    
    <div id="scid:9ce6104f-a9aa-4a17-a79f-3a39532ebf7c:ff559daf-a03c-452a-a2df-7aff51339978" class="wlWriterEditableSmartContent" style="float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px">
      <div style="border: #000080 1px solid; color: #000; font-family: 'Courier New', Courier, Monospace; font-size: 10pt">
        <div style="background: #000080; color: #fff; font-family: Verdana, Tahoma, Arial, sans-serif; font-weight: bold; padding: 2px 5px">
          DefaultModelBinderEx
        </div>
        
        <div style="background: #ddd; max-height: 300px; overflow: auto">
          <ol start="1" style="background: #1e1e1e; margin: 0 0 0 2.5em; padding: 0 0 0 5px; white-space: nowrap">
            <li>
              <span style="background:#1e1e1e;color:#569cd6">public</span><span style="background:#1e1e1e;color:#dcdcdc"> </s pan><span style="background:#1e1e1e;color:#569cd6">class</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">DefaultModelBinderEx</span><span style="background:#1e1e1e;color:#dcdcdc"> : </span><span style="background:#1e1e1e;color:#4ec9b0">DefaultModelBinder</span></li> 
              
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">{</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">    </span><span style="background:#1e1e1e;color:#569cd6">protected</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">override</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">void</span><span style="background:#1e1e1e;color:#dcdcdc"> BindProperty(</span><span style="background:#1e1e1e;color:#4ec9b0">ControllerContext</span><span style="background:#1e1e1e;color:#dcdcdc"> controllerContext, </span><span style="background:#1e1e1e;color:#4ec9b0">ModelBindingContext</span><span style="background:#1e1e1e;color:#dcdcdc"> bindingContext,</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#4ec9b0">PropertyDescriptor</span><span style="background:#1e1e1e;color:#dcdcdc"> propertyDescriptor)</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">    {</span>
              </li>
              <li>
                &nbsp;
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> cmbattr </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> propertyDescriptor</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Attributes</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">OfType</span><span style="background:#1e1e1e;color:#b4b4b4"><</span><span style="background:#1e1e1e;color:#4ec9b0">CustomModelBinderAttribute</span><span style="background:#1e1e1e;color:#b4b4b4">></span><span style="background:#1e1e1e;color:#dcdcdc">()</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">FirstOrDefault();</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#b8d7a3">IModelBinder</span><span style="background:#1e1e1e;color:#dcdcdc"> binder;</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">        </span><span style="background:#1e1e1e;color:#569cd6">if</span><span style="background:#1e1e1e;color:#dcdcdc"> (cmbattr </span><span style="background:#1e1e1e;color:#b4b4b4">!=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">null</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#b4b4b4">&&</span><span style="background:#1e1e1e;color:#dcdcdc"> (binder </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> cmbattr</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">GetBinder()) </span><span style="background:#1e1e1e;color:#b4b4b4">!=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">null</span><span style="background:#1e1e1e;color:#dcdcdc">)</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">        {</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> subPropertyName </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">DefaultModelBinder</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">CreateSubPropertyName(bindingContext</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ModelName, propertyDescriptor</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Name);</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> obj </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> propertyDescriptor</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">GetValue(bindingContext</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Model);</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> modelMetadata </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> bindingContext</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">PropertyMetadata[propertyDescriptor</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Name];</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">            modelMetadata</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">Model </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> obj;</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> bindingContext1 </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#569cd6">new</span><span style="background:#1e1e1e;color:#dcdcdc"> </span><span style="background:#1e1e1e;color:#4ec9b0">ModelBindingContext</span><span style="background:#1e1e1e;color:#dcdcdc">()</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">            {</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">                ModelMetadata </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> modelMetadata,</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">                ModelName </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> subPropertyName,</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">                ModelState </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> bindingContext</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ModelState,</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">                ValueProvider </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;color:#dcdcdc"> bindingContext</span><span style="background:#1e1e1e;color:#b4b4b4">.</span><span style="background:#1e1e1e;color:#dcdcdc">ValueProvider</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">            };</span>
              </li>
              <li>
                <span style="background:#1e1e1e;color:#dcdcdc">            </span><span style="background:#1e1e1e;color:#569cd6">var</span><span style="background:#1e1e1e;color:#dcdcdc"> propertyValue </span><span style="background:#1e1e1e;color:#b4b4b4">=</span><span style="background:#1e1e1e;col

or:#dcdcdc"> this.GetPropertyValue(controllerContext, bindingContext1, propertyDescriptor, binder);

SetProperty(controllerContext, bindingContext, propertyDescriptor, propertyValue);

return;

}

base.BindProperty(controllerContext, bindingContext, propertyDescriptor);

}