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POWhy am I not able to pass a JSON object to a WCF web service?
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copied!<p>I built a fairly complex app using the older "ASMX" web service implementation and I am migrating to WCF. There is one thing that is just driving me crazy - it <em>should</em> be easy but my AJAX calls error out no matter how I try to structure this call. This worked fine with ASMX calls but not with WCF.</p> <p>Here is the AJAX call:</p> <pre><code> var ProfileData = new Object(); ProfileData.SUID = SUID; ProfileData.FirstName = $("#FirstName").val(); ProfileData.LastName = $("#LastName").val(); ProfileData.Birthdate = new Date($("#Birthdate").val()); var DTO = {'ProfileData': ProfileData }; $.ajax({ type: "POST", url: "AllianceService.svc/SaveBasicProfile", data: JSON.stringify(DTO), contentType: "application/json; charset=utf-8", dataType: "json", success: function (msg) { UpdateTips($("#BasicProfileValidate"), "Success! Your data has been updated."); } }, error: function (xhr, ajaxOptions, thrownError, request, error) { alert('Error Saving Basic Profile Data'); } }); </code></pre> <p>Here is the declaration of the type on the C# / Server side:</p> <pre><code>[DataContract] public class BasicFolderData { [DataMember] public string SUID { get; set; } [DataMember] public string FirstName { get; set; } [DataMember] public string LastName { get; set; } [DataMember] public DateTime Birthdate { get; set; } } </code></pre> <p>And here is the definition of the service:</p> <pre><code> [OperationContract] public int SaveBasicProfile(BasicFolderData ProfileData) { ... do stuff } </code></pre> <p>Now, if I break out all of the datamembers and use them as parameters, I can get this to work with a simple </p> <pre><code> data: JSON.stringify(ProfileData) </code></pre> <p>But the object is actually much longer than this and I'd like to know how to pass objects. </p> <p>Also, I have tried:</p> <pre><code> data: JSON.stringify({"ProfileData": ProfileData }), </code></pre> <p>and</p> <pre><code> data: JSON.stringify('{"ProfileData":' + ProfileData + '}'), </code></pre> <p>and</p> <pre><code> data: '{"ProfileData":' + JSON.stringify(ProfileData) + '}', </code></pre> <p>but all to no avail...I get the error message on all of them.</p> <p>If I use: </p> <pre><code> data: JSON.stringify(ProfileData), </code></pre> <p>then, oddly enough, the request makes it to the server but the ProfileData parameter is null. I suspect that the problem is my datacontract but don't know where to start. Also, I have a lot of functions with scalar parameters that work just fine - it is only when I attempt to pass objects that I fail. Any help would be greatly appreciated!!</p> <p>Following DonAndre's suggestion, I have found that simply changing the parameter to a scalar type will make the call succeed. However, the parameter is always null.</p>

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