How to Properly Bind Dictionaries in ASP.NET MVC Views?

Successfully Binding Dictionaries in ASP.NET MVC Views

Binding dictionaries to ASP.NET MVC views can present challenges, often resulting in missing initial values or null properties after form submission. This guide clarifies how to correctly bind dictionaries, ensuring data persists through the view and model binding process.

The problem often arises when a dictionary is initialized with predefined values within the model. The standard MVC model binder doesn't directly support this initialization method. To resolve this, we must leverage the indexer syntax property[key] within the view.

Here's the corrected approach for your view:

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

This updated code uses @Html.Hidden to correctly bind the keys and @Html.TextBox to handle the values, employing the proper indexer syntax Params[key] for each key-value pair. This ensures the model binder accurately maps submitted data to the Params dictionary on form submission. The key is hidden to preserve it during submission. The value is exposed for user input.

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