Kendo Grid json字符串超出了maxJsonLength属性上设置的值

Question

在尝试将json字符串放入我的kendo网格时，我一直收到此错误。我在web.config中设置了最大大小

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

我还尝试将其直接添加到控制器中。这就是我生成json字符串的方法

public ActionResult ChangeRequests_Read([DataSourceRequest] DataSourceRequest request)
    {
        return Json(GetRequests().ToDataSourceResult(request), JsonRequestBehavior.AllowGet);
    }

public static IEnumerable<ChangeRequestsVM> GetRequests()
    {
        var model = CompanyContextFactory.GetContextPerRequest();
        var chrwVM =  model.ChangeRequestsHDRs.Where(ch=> ch.CompanyID == GlobalVariables.CompanyID).Select(ch=> new ChangeRequestsVM
        {
            RequestID = ch.RequestID, 
            CompanyID = ch.CompanyID,
            ClientID = ch.ClientID,
            EmployeeID = (string.IsNullOrEmpty(ch.EmployeeID)) ? "NA" : ch.EmployeeID,
            AssignmentType = ch.AssignmentType,
            Key1 = ch.Key1,
            Key2 = ch.Key2,
            LogonID = ch.LogonID,
            ProcessDate = ch.ProcessDate,
            ProcessTime = ch.ProcessTime,
            ProcessUserID = ch.ProcessUserID,
            RequestDate = ch.RequestDate,
            RequestExport = ch.RequestExport,
            RequestNote = ch.RequestNote,
            RequestOrigin = Convert.ToChar(ch.RequestOrigin),
            RequestProcess = ch.RequestProcess,
            RequestStatus = ch.RequestStatus,
            RequestTime = ch.RequestTime,
            RequestType = Convert.ToChar(ch.RequestType),
            ResponseNote = ch.ResponseNote,
            TableName = ch.TableName,
            TransferDate = ch.TransferDate,
            TransferTime = ch.TransferTime,
            TransferUserID = ch.TransferUserID,
            dispOrigin = (Convert.ToChar(ch.RequestOrigin) == ChangeRequestOrigin.System) ? "System" : (Convert.ToChar(ch.RequestOrigin) == ChangeRequestOrigin.Client) ? "Client" : "Employee",
            dispRequestType = (Convert.ToChar(ch.RequestType) == ChangeRequestType.Insert) ? "Insert" : (Convert.ToChar(ch.RequestType) == ChangeRequestType.Alter) ? "Change" : "Delete",
            dispStatus = FieldTranslation.GetEnumDescription(typeof(enChangeRequestStatus), ch.RequestStatus ?? 0)
        }).OrderByDescending(ch=> ch.RequestID);

        return chrwVM;
    }

这是我得到的完整错误。发送的字符串是巨大的，但我不知道如何弄清楚它有多大。我错过了什么让JSON字符串返回而没有错误？

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

我也是这样试过的

public ActionResult ChangeRequests_Read([DataSourceRequest] DataSourceRequest request)
    {
        var result = Json(GetRequests().ToDataSourceResult(request), JsonRequestBehavior.AllowGet);

        var serializer = new JavaScriptSerializer();

        // For simplicity just use Int32's max value.
        // You could always read the value from the config section mentioned above.
        serializer.MaxJsonLength = Int32.MaxValue;

        var resultData = new { result };
        var result1 = new ContentResult
        {
            Content = serializer.Serialize(resultData),
            ContentType = "application/json"
        };
        return result1;
    }

    public static IEnumerable<ChangeRequestsVM> GetRequests()
    {
        var model = CompanyContextFactory.GetContextPerRequest();
        var chrwVM =  model.ChangeRequestsHDRs.Where(ch=> ch.CompanyID == GlobalVariables.CompanyID).Select(ch=> new ChangeRequestsVM
        {
            RequestID = ch.RequestID, 
            CompanyID = ch.CompanyID,
            ClientID = ch.ClientID,
            EmployeeID = (string.IsNullOrEmpty(ch.EmployeeID)) ? "NA" : ch.EmployeeID,
            AssignmentType = ch.AssignmentType,
            Key1 = ch.Key1,
            Key2 = ch.Key2,
            LogonID = ch.LogonID,
            ProcessDate = ch.ProcessDate,
            ProcessTime = ch.ProcessTime,
            ProcessUserID = ch.ProcessUserID,
            RequestDate = ch.RequestDate,
            RequestExport = ch.RequestExport,
            RequestNote = ch.RequestNote,
            RequestOrigin = Convert.ToChar(ch.RequestOrigin),
            RequestProcess = ch.RequestProcess,
            RequestStatus = ch.RequestStatus,
            RequestTime = ch.RequestTime,
            RequestType = Convert.ToChar(ch.RequestType),
            ResponseNote = ch.ResponseNote,
            TableName = ch.TableName,
            TransferDate = ch.TransferDate,
            TransferTime = ch.TransferTime,
            TransferUserID = ch.TransferUserID,
            dispOrigin = (Convert.ToChar(ch.RequestOrigin) == ChangeRequestOrigin.System) ? "System" : (Convert.ToChar(ch.RequestOrigin) == ChangeRequestOrigin.Client) ? "Client" : "Employee",
            dispRequestType = (Convert.ToChar(ch.RequestType) == ChangeRequestType.Insert) ? "Insert" : (Convert.ToChar(ch.RequestType) == ChangeRequestType.Alter) ? "Change" : "Delete",
            dispStatus = FieldTranslation.GetEnumDescription(typeof(enChangeRequestStatus), ch.RequestStatus ?? 0)
        }).OrderByDescending(ch=> ch.RequestID);

        return chrwVM;
    }