/// <summary>
/// Callback method of the delete operation.
/// </summary>
/// <param name="result"></param>
private void OnChangesSaved(IAsyncResult result)
{
Dispatcher.BeginInvoke(() =>
{
SchoolLinqToSQLDataContext svcContext = result.AsyncState as SchoolLinqToSQLDataContext;
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>
/// 删除操作的回调事件。
/// </summary>
/// <param name="result"></param>
private void OnChangesSaved(IAsyncResult result)
{
Dispatcher.BeginInvoke(() =>
{
SchoolLinqToSQLDataContext svcContext = result.AsyncState as SchoolLinqToSQLDataContext;
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，并通过刷新本页或者直接查看数据库来看操作结果。
LoadData();
}
});
}
/// <summary>
/// In this method we send a REST request to ADO.NET Data Service to request CourseGrade
/// records. We expand Person and Course so the foreign records will be returned as well
/// </summary>
private void LoadData()
{
_context = new SchoolLinqToSQLDataContext(new Uri(_schoolLinqToSQLUri));
DataServiceQuery <CourseGrade> query = (DataServiceQuery <CourseGrade>)(
from c in _context.CourseGrades.Expand("Person").Expand("Course")
select c);
query.BeginExecute(OnCourseGradeQueryComplete, query);
}
