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I want to send a complex object with a nested array in the uri to an MVC action method in a GET request. Consider the following code: public ActionResult AutoCompleteHandler([FromUri]PartsQuery partsQuery){ ... } public class PartsQuery { public Part[] Parts {get; set; } public string LastKey { get; set; } public string Term { get; set; } } $.ajax({ url: "Controller/AutoCompleteHandler", data: $.param({ Parts: [{ hasLabel: "label", hasType: "type", hasIndex : 1 }], LastKey : "Last Key", Term : "Term" }), dataType: "json", success: function(jsonData) { ... } }); This works just fine and binds correctly using the default model binder in MVC Web Api . However, switch this to plain MVC not WebApi and the default model binder breaks down and cannot bind the properties on objects in the nested array: Watch List partsQuery != null //Good --LastKey == "Last Key" //Good --Term == "Term" //Good --Parts[] != null //Good ----hasLabel == null //Failed to bind ----hasType == null //Failed to bind ----hasIndex == 0 //Failed to bind I would like to know why this breaks down in plain MVC and how to make FromUriAttribute bind this object correctly in plain MVC

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