json - 字符串的长度超过了 maxJsonLength 属性上设置的值。在 MVC3 中

Question

MVC3（.cshtml 文件）

$.getJSON(URL, Data, function (data) {

                    document.getElementById('divDisplayMap').innerHTML = data;

                    if (data != null) {
                        $('#myTablesId').show();
                        tdOnclickEvent();

                    }
                    else {
                        $('#myTablesId').hide();
                    }
                }).error(function (xhr, ajaxOptions, thrownError) { debugger; });

在服务器端

 public JsonResult ZoneType_SelectedState(int x_Id, int y_Id)
    {
    JsonResult result = new JsonResult();
     result.Data = "LongString";//Longstring with the length mention below
    return Json(result.Data,"application/json", JsonRequestBehavior.AllowGet);
    }

从服务器端，我传递长度为 1194812 的字符串，不止于此。但我收到错误消息

"Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property."

请帮我解决 ASP

Answer 1

您可以编写一个自定义 ActionResult ，它允许您指定序列化程序可以处理的最大数据长度：

public class MyJsonResult : ActionResult
{
    private readonly object data;
    public MyJsonResult(object data)
    {
        this.data = data;
    }

    public override void ExecuteResult(ControllerContext context)
    {
        var response = context.RequestContext.HttpContext.Response;
        response.ContentType = "application/json";
        var serializer = new JavaScriptSerializer();
        // You could set the MaxJsonLength to the desired size - 10MB in this example
        serializer.MaxJsonLength = 10 * 1024 * 1024;
        response.Write(serializer.Serialize(this.data));
    }
}

然后使用它：

public ActionResult ZoneType_SelectedState(int x_Id, int y_Id)
{
    string data = "LongString";//Longstring with the length mention below;
    return new MyJsonResult(data);
}

Answer 2

尝试更新您的Controller方法，如下所示：

public JsonResult ZoneType_SelectedState(int x_Id, int y_Id)
{
    var result = Json("LongString", JsonRequestBehavior.AllowGet);
    result.MaxJsonLength = int.MaxValue;
    return result;
}

希望这可以帮助...