wpf 异步调用接口 DataGrid 数据控件数据源绑定问题， 非常郁闷.....

Question

在WPF 应用程序中... 用异步委托的方式去调用接口函数， 返回的结果去 赋值给DataGrid 控件，   现在的问题是第一次取到得值赋给DataGrid ，这时候UI界面不呈现， 第二次取值在去赋给DataGrid 就显示了， 太郁闷了， 异步调用看不出来有问题啊，都是UI的线程来操作，附代码.....请高手指点下，等待中....

            
            Func<string, student> asyncAction = studentBLL.SingleEntity;//声明委托调用
            #region 回调函数
            Action<IAsyncResult> resultHandler = delegate(IAsyncResult asyncResult)
            {

                try
                {
                    student rsObj = asyncAction.EndInvoke(asyncResult);
                    if (asyncResult.IsCompleted)
                    {
                        if (rsObj != null)
                        {
                            //lock (_DataBindLock)
                            //{
                            var rs = rsObj.JsonObj;

                             this.DataGrid.ItemsSource = rs ; //就是hi在这里赋值，第一次取值（数据也取到了）不显示，第二次就行，是不是异步调用这样写不行呀....
                            //}
                        }
                        //Thread.Sleep(500);
                        
                    }

                }
                catch (Exception ex)
                {
                    
                    LogHelper.Error(typeof(ProcessDesign), "", ex);
                    
                    return;
                }


            };
            #endregion
            AsyncCallback asyncActionCallback = delegate(IAsyncResult asyncResult)
            {
                this.Dispatcher.BeginInvoke(DispatcherPriority.DataBind, resultHandler, asyncResult);
            };
            asyncAction.BeginInvoke("123", asyncActionCallback, null);

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efforts..

Answer 1

你试着刷新一下你的DataGrid

 private delegate void NoArgDelegate();

 public static void Refresh(DependencyObject obj)

 {

            obj.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.ApplicationIdle,

                (NoArgDelegate)delegate { });

 }

 private void Button_Click(object sender, RoutedEventArgs e)

 {

             Refresh(testDtGrid);           

       

}

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Sheldon _Xiao
MSDN Community Support | Feedback to us
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Answer 2

非常感谢回复....原来是样式的问题....

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efforts..