How to Properly Bind Dictionary Values in ASP.NET MVC?

Successfully Binding Dictionaries in ASP.NET MVC

Working with dictionaries in ASP.NET MVC view models can sometimes present challenges. Issues like missing initial values in the view or a null Params property after form submission are common. The key to resolving these problems lies in understanding and correctly applying the dictionary binding syntax.

In ASP.NET MVC 4 and later versions, the model binder expects a specific format for dictionary binding: property[key]. This means your view's input elements must adhere to this syntax.

Here's the corrected approach for rendering and binding dictionary values within your view:

<code class="language-csharp">@foreach (KeyValuePair<string, string> kvp in Model.Params)
{
    <tr>
        <td>
            @Html.TextBox("Params[" + kvp.Key + "]")
        </td>
    </tr>
}</code>

Notice the crucial change: Params[Key] is replaced with the dynamic construction Params[" kvp.Key "]. This ensures each input element is correctly named with the appropriate key from your dictionary. An input element named "Params[Value1]" will now correctly map to the "Value1" key within the Params dictionary in your model. This dynamic key ensures proper data binding on postback.

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