使用ADO.NET数据服务时保存实体错误 [英] Save entity error when using ADO.NET Data Service

问题描述

我尝试使用以下代码来保存数据异步：

NorthwindEntities svcx = new NorthwindEntities（new Uri（" NorthwindDataService.svc"，UriKind.Relative））;
try
{
svcx.UpdateObject（_people）; //在这一行，得到错误
svcx.BeginSaveChanges（delegate（IAsyncResult result）























（DataServiceRequestException ex）
{
Debug.WriteLine（" OnSaveChangesCompleted Error：" + ex.Response.ToString（））;
}

}，_poeple）;
}
catch（DataServiceRequestException ex）
{
Debug.WriteLine（" OnUpdate Error：" + ex.Response.ToString（））;
但是当运行转到行svcx.UpdateObject（_people）时; ，我收到如下错误：

System.Data.Services.Client中发生了'System.ArgumentException'类型的异常，但未在用户代码中处理

其他信息：上下文是目前没有跟踪实体。

它有什么问题？如何解决？

解决方案

您好，

在UpdateObject调用之前需要这一行：

svcx.AttachTo（" NameOfThEntitySet"，_ people）;& nbsp;

I tried to use following code to save data async:

          NorthwindEntities svcx = new   NorthwindEntities(new Uri("NorthwindDataService.svc", UriKind.Relative));                      
            try
            {  
                svcx.UpdateObject(_people);    //at this line, get error
                svcx.BeginSaveChanges(delegate(IAsyncResult result)
                {
                    try
                    {
                        svcx.EndSaveChanges(result);                       
                    }
                    catch (DataServiceRequestException ex)
                    {
                        Debug.WriteLine("OnSaveChangesCompleted Error: " + ex.Response.ToString());
                    }

                }, _poeple);
            }
            catch (DataServiceRequestException ex)
            {
                Debug.WriteLine("OnUpdate Error: " + ex.Response.ToString());
            }

But when the running went to the line  svcx.UpdateObject(_people); , I got error as below:

An exception of type 'System.ArgumentException' occurred in System.Data.Services.Client but was not handled in user code

Additional information: The context is not currently tracking the entity.

What's wrong with it? how to fix it?

解决方案

Hi,

You need this line before the UpdateObject call :

svcx.AttachTo("NameOfThEntitySet",_people); 

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