使用JSON JavaScriptSerializer序列化或反序列化时出错

本文关键字：反序列化 出错 序列化 JSON JavaScriptSerializer 使用 | 更新日期: 2023-09-27 18:16:55

当尝试创建json时，我一直得到这个错误。这是完整的错误

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

我的代码如下

public ActionResult ChangeRequests_Read([DataSourceRequest] DataSourceRequest request)
    {
        var data = GetRequests();
        var serializer = new JavaScriptSerializer();
        var result = new ContentResult();
        serializer.MaxJsonLength = Int32.MaxValue; // Whatever max length you want here
        result.Content = serializer.Serialize(data.ToDataSourceResult(request));
        result.ContentType = "application/json";
        return result;
        //return Json(GetRequests().ToDataSourceResult(request), JsonRequestBehavior.AllowGet);
    }

这个从这里拉过来

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;
    }

为什么我的json超过长度?我已经这样做了，所以方法只从数据库中提取一个项目，仍然得到错误。

使用JSON JavaScriptSerializer序列化或反序列化时出错

你需要增加MaxJsonLength属性的大小:

https://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.maxjsonlength.aspx

这在配置文件中完成。详情请看上面的链接。

更新:

既然你正在使用MVC，你可以使用以下应用程序设置:

<appSettings>
    <add key="aspnet:MaxJsonDeserializerMembers" value="123456789" />
...
</appSettings>

但是，要注意这是一个潜在的安全风险。阅读更多:

https://msdn.microsoft.com/en-us/library/hh975440 (v = vs.120) . aspx

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