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POPost an Array of Objects via JSON to ASP.Net MVC3
 

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    <p>I'm looking for a solution to POSTing an array of objects to MVC3 via JSON.</p> <p>Example code I'm working off of: <a href="http://weblogs.asp.net/scottgu/archive/2010/07/27/introducing-asp-net-mvc-3-preview-1.aspx" rel="nofollow noreferrer">http://weblogs.asp.net/scottgu/archive/2010/07/27/introducing-asp-net-mvc-3-preview-1.aspx</a></p> <p>JS:</p> <pre><code>var data = { ItemList: [ {Str: 'hi', Enabled: true} ], X: 1, Y: 2 }; $.ajax({ url: '/list/save', data: JSON.stringify(data), success: success, error: error, type: 'POST', contentType: 'application/json, charset=utf-8', dataType: 'json' }); </code></pre> <p>ListViewModel.cs:</p> <pre><code>public class ListViewModel { public List&lt;ItemViewModel&gt; ItemList { get; set; } public float X { get; set; } public float Y { get; set; } } </code></pre> <p>ItemViewModel.cs:</p> <pre><code>public class ItemViewModel { public string Str; // originally posted with: { get; set; } public bool Enabled; // originally posted with: { get; set; } } </code></pre> <p>ListController.cs:</p> <pre><code>public ActionResult Save(ListViewModel list) { // Do something } </code></pre> <p>The result of this POST:</p> <p>list is set, to a ListViewModel<br> Its X and Y properties are set<br> The underlying ItemList property is set<br> The ItemList contains one item, as it should<br> The item in that ItemList is uninitialized. Str is null and Enabled is false. </p> <p>Put another way, this is what I get from MVC3's model binding:</p> <pre><code>list.X == 1 list.Y == 2 list.ItemList != null list.ItemList.Count == 1 list.ItemList[0] != null list.ItemList[0].Str == null </code></pre> <p>It would appear the MVC3 JsonValueProvider is not working for complex objects. How do I get this to work? Do I need to modify the existing MVC3 JsonValueProvider and fix it? If so, how do I get at it and replace it in an MVC3 project?</p> <p>Related StackOverflow questions I've already pursued to no avail:</p> <p><a href="https://stackoverflow.com/questions/2203912/asp-net-mvc-ajax-json-post-array">Asp.net Mvc Ajax Json (post Array)</a> Uses MVC2 and older form-based encoding - that approach fails with an object that contains an array of objects (JQuery fails to encode it properly).</p> <p><a href="https://stackoverflow.com/questions/760249/post-an-array-of-complex-objects-with-json-jquery-to-asp-net-mvc-controller">Post an array of complex objects with JSON, JQuery to ASP.NET MVC Controller</a> Uses a hack I'd like to avoid where the Controller instead receives a plain string which it then manually deserializes itself, rather than leveraging the framework.</p> <p><a href="https://stackoverflow.com/questions/4627985/mvc3-rc2-json-post-binding-not-working-correctly">MVC3 RC2 JSON Post Binding not working correctly </a> Didn't have his content-type set - it's set in my code.</p> <p><a href="https://stackoverflow.com/questions/320291/how-to-post-an-array-of-complex-objects-with-json-jquery-to-asp-net-mvc-controll">How to post an array of complex objects with JSON, jQuery to ASP.NET MVC Controller?</a> This poor guy had to write a JsonFilter just to parse an array. Another hack I'd prefer to avoid.</p> <p>So, how do I make this happen?</p>
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    1. COUpdate: I've dug into the JsonValueProviderFactory. It correctly consumes the "str" property and adds it to the backing Dictionary as Key="ItemList[0].Str", Value="hi", which looks correct. ModelBinder?
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    2. COYou sir, just received an upvote and a star for your excellent execution of a stack overflow-question! :)
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    3. COSame here, this was the one finally made it work for me. Thanks!
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