MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer
In one of my controller actions I am returning a very large JsonResult to fill a grid.
I am getting the following InvalidOperationException exception:
Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.
Setting the maxJsonLength property in the web.config to a higher value unfortunately does not show any effect.
<system.web.extensions>
<scripting>
<webServices>
<jsonSerialization maxJsonLength="2147483644"/>
</webServices>
</scripting>
</system.web.extensions>
I don't want to pass it back as a string as mentioned in this SO answer.
In my research I came across this blog post where writing an own ActionResult (eg LargeJsonResult : JsonResult ) is recommended to bypass this behaviour.
Is this then the only solution?
Is this a bug in ASP.NET MVC?
Am I missing something?
Any help would be most appreciated.
It appears this has been fixed in MVC4.
You can do this, which worked well for me:
public ActionResult SomeControllerAction()
{
var jsonResult = Json(veryLargeCollection, JsonRequestBehavior.AllowGet);
jsonResult.MaxJsonLength = int.MaxValue;
return jsonResult;
}
您也可以像这里建议的那样使用ContentResult而不是子类化JsonResult 。
var serializer = new JavaScriptSerializer { MaxJsonLength = Int32.MaxValue, RecursionLimit = 100 };
return new ContentResult()
{
Content = serializer.Serialize(data),
ContentType = "application/json",
};
Unfortunately the web.config setting is ignored by the default JsonResult implementation. So I guess you will need to implement a custom json result to overcome this issue.
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