ASP.NET Jquery ReferenceError:未定义系统

Question

简单的事情:我想从aspx-Page调用aspx.cs中的一个C#函数。

我的C#函数(Kalender.aspx.cs)：

protected JsonResult GetEvents()
    {
        //DATABASE READOUT
        using (DatabaseEntities dc = new DatabaseEntities())
        {
            var events = dc.Events.ToList();
            JsonResult json = new JsonResult { Data = events, JsonRequestBehavior = JsonRequestBehavior.AllowGet };
            return json;
        }
    }

我的JS调用(Kalender.aspx)：

        //DATABASE READOUT
        var json

        try { //DIRECT CALL
            var data = <%= GetEvents()%>;  //<<-- throw ReferenceError: System is not defined
            alert('DIRECT CALL: ' + typeof (data) + ' | ' + data[0]);
            json = JSON.parse(data);
        } catch (error) {
            alert(error + "\r" + error.name + "\r" + error.message);
        }

来自GetEvents()事件包括存储在SQL中的JsonResult对象。因此，我添加了一个ADO.NET实体数据模型：

public partial class Events
{
    public int EventID { get; set; }
    public string Subject { get; set; }
    public string Description { get; set; }
    public System.DateTime Start { get; set; }
    public Nullable<System.DateTime> End { get; set; }
    public string Color { get; set; }
    public bool IsFullDay { get; set; }
}

如果模型不起作用，<%= GetEvents()%>抛出正确的错误：“模型未定义”。

那么，错误“系统未定义”的意义何在？我花了一小时又一小时，找不到解决方案。请帮助我们，感谢您的回复。

(我生命中最糟糕的事情是:昨天一切正常，该死的var接受了JsonResult，我就可以读出数据了。第二天早上，我会清理代码。重命名一些东西。世界末日。什么都不能用了，我从头开始，不知道哪里出了问题。我很难过。:( )

编辑###

控制台输出：

Application Insights Telemetry (unconfigured): {"name":"Microsoft.ApplicationInsights.Dev.RemoteDependency","time":"2018-04-02T11:49:50.7556362Z","tags":{"ai.internal.nodeName":"LAPTOP-81CNBL6C","ai.operation.parentId":"Y67fpD/L2MI=","ai.operation.name":"GET /Pages/Kalender","ai.operation.id":"Y67fpD/L2MI=","ai.location.ip":"::1","ai.cloud.roleInstance":"LAPTOP-81CNBL6C","ai.internal.sdkVersion":"rddf:2.2.0-738"},"data":{"baseType":"RemoteDependencyData","baseData":{"ver":2,"name":"(LocalDB)\\MSSQLLocalDB | C:\\USERS\\MARTIN\\DOCUMENTS\\VISUAL STUDIO 2017\\PROJECTS\\HOMEOFFICE\\HOMEOFFICE\\APP_DATA\\DATABASE.MDF","id":"zYD3G9N1sOI=","duration":"00:00:00.0110000","resultCode":"0","success":true,"type":"SQL","target":"(LocalDB)\\MSSQLLocalDB | C:\\USERS\\MARTIN\\DOCUMENTS\\VISUAL STUDIO 2017\\PROJECTS\\HOMEOFFICE\\HOMEOFFICE\\APP_DATA\\DATABASE.MDF","properties":{"DeveloperMode":"true"}}}}
Application Insights Telemetry (unconfigured): {"name":"Microsoft.ApplicationInsights.Dev.Request","time":"2018-04-02T11:49:48.6739718Z","tags":{"ai.operation.name":"GET /Pages/Kalender","ai.operation.id":"Y67fpD/L2MI=","ai.location.ip":"::1","ai.cloud.roleInstance":"LAPTOP-81CNBL6C","ai.internal.sdkVersion":"web:2.2.0-738"},"data":{"baseType":"RequestData","baseData":{"ver":2,"id":"Y67fpD/L2MI=","name":"GET /Pages/Kalender","duration":"00:00:02.3570000","success":true,"responseCode":"200","url":"http://localhost:56879/Pages/Kalender","properties":{"DeveloperMode":"true"}}}}

Answer 1

几个小时之后，我找到了一个简单的解决方案。

我在我的C#代码中添加：

return new JavaScriptSerializer().Serialize(json.Data);

并接受我的函数返回字符串而不是JsonResult：

        protected string GetEvents()
    {
        //DATABASE READOUT
        using (DatabaseEntities dc = new DatabaseEntities())
        {
            var events = dc.Events.ToList();
            JsonResult json = new JsonResult { Data = events, JsonRequestBehavior = JsonRequestBehavior.AllowGet };
            return new JavaScriptSerializer().Serialize(json.Data);
        }
    }

JavaScript handel说得很好。var将理解形成并自动转换为json。