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How to allow exception for exceeding maxJsonLength in JavaScriptSerializer?

I found several answers that address this issue in the context of a large answer, but none of my large request contexts. When submitting a large file to an action method, I get the following exception:

An error occurred while serializing or deserializing using the JSON JavaScriptSerializer. The string length exceeds the set value by the maxJsonLength property.

This is before my actions get removed, so the plethora of messages that tell me to set a higher json size for my response are useless here.

Stack trace:

at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit)
at System.Web.Script.Serialization.JavaScriptSerializer.DeserializeObject(String input)
at System.Web.Mvc.JsonValueProviderFactory.GetDeserializedObject(ControllerContext controllerContext)
at System.Web.Mvc.JsonValueProviderFactory.GetValueProvider(ControllerContext controllerContext)
at System.Web.Mvc.ValueProviderFactoryCollection.<>c__DisplayClassc.<GetValueProvider>b__7(ValueProviderFactory factory)
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at System.Web.Mvc.ValueProviderFactoryCollection.GetValueProvider(ControllerContext controllerContext)
at System.Web.Mvc.ControllerBase.get_ValueProvider()
at System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor)
at System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<BeginInvokeAction>b__1e(AsyncCallback asyncCallback, Object asyncState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state)
at System.Web.Mvc.Controller.<>c__DisplayClass1d.<BeginExecuteCore>b__17(AsyncCallback asyncCallback, Object asyncState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
at System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
at System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state)
at System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state)
at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__2(AsyncCallback asyncCallback, Object asyncState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state)
at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state)
at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
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3 answers


The vast and panicked search engine came to this problem as another poor developer, and the answer is simple but disappointingly invasive:

You must first create a custom JsonValueProviderFactory.



I copied the custom code from my answer verbatim and it worked right away.

I know this is the answer to the link, but the link text is a pretty good answer I think.

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There are three main methods of handling this depending on the current environment:

  • Setting the MaxJsonLength

    default property value in your web.config. (This only applies to web services that handle JSON)
  • Setting an MaxJsonLength

    object property JavascriptSerializer

    to do your serialization.
  • If you are using MVC4

    to handle return values JSON

    , you can override the default JsonResult()

    ActionResult

    and manually change the maximum size.


Source and more information on how to implement these three solutions: http://rionscode.wordpress.com/2013/04/28/handling-larger-json-string-values-in-net-and-avoiding-exceptions/

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You can solve this problem either by specifying the keys in the Web.config, or in the controller, or both. Here's how to do it:

1.) In Web.config method-1:

<add key="aspnet:MaxJsonDeserializerMembers" value="214748364" />

2.) In Web.config method-2:

 <system.web.extensions>
    <scripting>
      <webServices>
        <jsonSerialization maxJsonLength="2147483644"></jsonSerialization>
      </webServices>
    </scripting>
  </system.web.extensions>

3.) In the controller when returning JSON data:

  var result = Json("Data", JsonRequestBehavior.AllowGet);
            result.MaxJsonLength = Int32.MaxValue;
            return result;
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