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POGet "Invalid web service call, missing value for parameter" error when calling a web service method using jQuery
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copied!<p>This is my aspx file code:</p> <pre><code> var DTO = { "'productCategoryId'": "'10'" }; $.ajax({ type: "GET", url: "/WebService/DsmWebServices.asmx/GetProductSubCategory", data: DTO, contentType: "application/json; charset=utf-8", dataType: "json", success: function (msg) { window.alert("success"); }, error: function (msg) { } }); </code></pre> <p>This is my web service method:</p> <pre><code> [WebMethod,ScriptMethod(UseHttpGet=true)] public bool GetProductSubCategory(int productCategoryId) { //do some stuff return true; } </code></pre> <p>The problem is that the jQuery function fails with the following error:</p> <pre><code> {"Message":"Invalid web service call, missing value for parameter: \u0027productCategoryId\u0027.","StackTrace":" at System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary`2 parameters)\r\n at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)\r\n at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)\r\n at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"} </code></pre> <p>By using Firebug, the URL jQuery requested was</p> <pre><code> http://192.168.1.100:8888/WebService/DsmWebServices.asmx/GetProductSubCategory?%27productCategoryId%27=%2710%27 </code></pre>

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