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POWebApi modelBinding fails when property inherits from Dictionary<string, string>
 

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  1. POWebApi modelBinding fails when property inherits from Dictionary<string, string>
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    <p>WebApi model binding fails when a property in the viewmodel <strong>inherits</strong> from <code>Dictionary&lt;string, string&gt;</code>. The same model binding works when the data type of the property is changed to just <code>Dictionary&lt;string, string&gt;</code>.</p> <p>Below is an example of the binding not working.</p> <p>When I submit the webpage data to the ApiController the binding will not bind the <strong><code>MyDictionary&lt;string, string&gt;</code></strong> ExtraData property. If I change the property to <strong><code>Dictionary&lt;string, string&gt;</code></strong> ExtraData property then Api controller will bind correctly. However this is not an option because the MyDictionary class has additional functionality that I need.</p> <p>I have a class that inherits from Dictionary<code>&lt;&gt;</code> that looks like the one below:</p> <pre><code>public class MyDictionary&lt;TKey, TVal&gt; : Dictionary&lt;TKey, TVal&gt; { } </code></pre> <p>I have a class that has a property of the type <strong>MyDictionary</strong></p> <pre><code>public class HomeModel { public string Name{ get; set; } public MyDictionary&lt;string, string&gt; ExtraData { get; set; } public HomeModel() { ExtraData = new MyDictionary&lt;string, string&gt;(); } } </code></pre> <p>I have a ApiController like this (it does NOT bind correctly. <strong>ExtraData.Count always returns zero</strong>):</p> <pre><code>public class HomeApiController : ApiController { // POST api/homeapi [HttpPost] [ActionName("Complex")] public string PostComplex([FromBody]HomeModel model) { return string.Format("vm.ExtraData.Count = {0}", model.ExtraData.Count); } } </code></pre> <p>The html form snippet looks like this:</p> <pre><code> &lt;ul&gt; &lt;li&gt; &lt;input type="text" name="ExtraData[0].Key" value="Key1"/&gt; &lt;input type="text" name="ExtraData[0].Value" value="Value1"/&gt; &lt;/li&gt; &lt;li&gt; &lt;input type="text" name="ExtraData[1].Key" value="Key2"/&gt; &lt;input type="text" name="ExtraData[1].Value" value="Value2"/&gt; &lt;/li&gt; &lt;li&gt; &lt;input type="text" name="ExtraData[2].Key" value="Key3"/&gt; &lt;input type="text" name="ExtraData[2].Value" value="Value3"/&gt; &lt;/li&gt; &lt;/ul&gt; </code></pre> <p>Any ideas as to why model binding does not work with an inherited property of <code>Dictionary&lt;string, string&gt;</code>?</p> <p>Data is being submitted to ApiController through a simple post as follows:</p> <pre><code> var sendFormData = function (addr) { var jqxhr = $.post(addr, $('form').serialize()) .success(function (x) { alert(x); }) .error(function () { alert("Failure"); }); return false; }; $("#submitWebApi").click(function () { $("form").submit(sendFormData('api/homeapi/complex')); }); </code></pre>
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    1. COI believe you may be able to do what you want if you 'decorate' your custom dictionary along the lines of [this SO question and answer](http://stackoverflow.com/questions/11235041/custom-serialisation-of-a-dictionary-in-a-datacontract). Not sure what `DataContract` specific config you'd need to do but it should be a start. Otherwise, it may be easier to encapsulate the extra functionality as extension methods to the generic Dictionary class.
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      1. USSixto Saez
    2. COIf you comment out the line in the constructor of the `HomeModel` class that initialized the dictionary does the dictionary still have no entries? is it null in this case, empty or does it contain data?
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      1. USJoanna Derks
    3. CO@JoannaTurban When I comment out the line in the constructor the dictionary is initialized but it still has no entries.
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      1. USt-boy
 

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