/// <summary>
/// 更新操作的回调方法。
/// </summary>
/// <param name="result"></param>
private void OnChangesSaved(IAsyncResult result)
{
Dispatcher.BeginInvoke(() =>
{
SQLServer2005DBEntities svcContext = result.AsyncState as SQLServer2005DBEntities;
try
{
// 完成保存改变操作并显示结果。
WriteOperationResponse(svcContext.EndSaveChanges(result));
}
catch (DataServiceRequestException ex)
{
// 显示错误信息。
WriteOperationResponse(ex.Response);
}
catch (InvalidOperationException ex)
{
messageTextBlock.Text = ex.Message;
}
finally
{
// 重新加载绑定的集合来刷新Grid，显示操作的结果。
// 你也可以删除下边的代码行，并通过刷新本也或者直接查看数据库来看操作结果。
LoadData();
}
}
);
}
/// <summary>
/// Callback method of the update operation.
/// </summary>
/// <param name="result"></param>
private void OnChangesSaved(IAsyncResult result)
{
Dispatcher.BeginInvoke(() =>
{
SQLServer2005DBEntities svcContext = result.AsyncState as SQLServer2005DBEntities;
try
{
// Complete the save changes operation and display the response.
WriteOperationResponse(svcContext.EndSaveChanges(result));
}
catch (DataServiceRequestException ex)
{
// Display the error from the response.
WriteOperationResponse(ex.Response);
}
catch (InvalidOperationException ex)
{
messageTextBlock.Text = ex.Message;
}
finally
{
// Reload the binding collection to refresh Grid to see if it's successfully updated.
// You can also remove the following line. To see the update effect, just refresh the page or check out database directly.
LoadData();
}
}
);
}
/// <summary>
/// 本方法中，发送一个异步的REST请求到ADO.NET Data Service来获得 CourseGrade 数据
/// 我们扩展了 Person 以及 Course，所以外部记录也会被返回到客户端。
/// </summary>
private void LoadData()
{
_entities = new SQLServer2005DBEntities(new Uri(_schoolLinqToEntitiesUri));
DataServiceQuery<CourseGrade> query = (DataServiceQuery<CourseGrade>)(
from c in _entities.CourseGrade.Expand("Person").Expand("Course")
select c);
query.BeginExecute(OnCourseGradeQueryComplete, query);
}
