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copied!<p>If you use ASMX services the <a href="http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx" rel="nofollow noreferrer">JavaScriptSerializer</a> will be responsible for the data conversion and not the <a href="http://msdn.microsoft.com/en-us/library/system.runtime.serialization.json.datacontractjsonserializer.aspx" rel="nofollow noreferrer">DataContractJsonSerializer</a>. So all <code>DataContract</code> attributes which you use <strong>will not work</strong>.</p> <p>You are write that classes like <code>public class TestCol : List<Test> { }</code> are bad for the <a href="http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx" rel="nofollow noreferrer">JavaScriptSerializer</a>, but classes having <code>List<Test></code> as the property (<code>public class MainTest { public List<Test> Components { get; set; }}</code>) have no problem.</p> <p>So I suggest to simplify you code to the following. The classes used as the parameters can be defines as</p> <pre><code>public class Test { public String Name { get; set; } } public class MainTest { public List<Test> Components { get; set; } } </code></pre> <p>The WebMethod <code>Test</code> will be</p> <pre><code>[WebMethod] public String Test(MainTest input) { StringBuilder rtrn = new StringBuilder(); foreach (Test test in input.Components) { rtrn.AppendLine (test.Name); } return rtrn.ToString (); } </code></pre> <p>and the ajax call can be</p> <pre><code>var tests = { Components: [ {Name:"Test1"}, {Name:"Test2"}, {Name:"Test3"} ] }; $.ajax({ type: "POST", url: "WebService1.asmx/Test", contentType: "application/json; charset=utf-8", dataType: "json", data: JSON.stringify({ "input": tests }), success: function (data, textStatus) { alert("success:\n" + data.d); }, error: function (XMLHttpRequest, textStatus, errorThrown) { alert(XMLHttpRequest.responseText+" || "+textStatus+" || "+errorThrown); } }); </code></pre> <p>How you can see all will be very simple and it's work. For more details how you can send complex data I recommend you to read <a href="https://stackoverflow.com/questions/3445859/asmx-web-service-json-javascript-jquery/3446517#3446517">another answer</a> and <a href="https://stackoverflow.com/questions/2737525/how-do-i-build-a-json-object-to-send-to-an-ajax-webservice/2738086#2738086">this</a>.</p>

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