/// <summary>
 /// 导入新生数据
 /// </summary>
 /// <param name="o"></param>
 private async void OnImportNewStudengts(object o)
 {
     if (AllowImport())
     {
         ErrorMsg = string.Empty;//清楚所有的错误消息
         if (ModernDialog.ShowMessage(string.Format("确定以 {0} 方式导入 {1} 批次吗?", ImporttypeValue, SelectPcdmItem.Pcdm), "消息", MessageBoxButton.OKCancel) == MessageBoxResult.OK)
         {
             SplanshScreenWindow splan = new SplanshScreenWindow();
             splan.Show();
             controls.ProgressBar progressBar = ((controls.UserControl)o).FindName("progress") as controls.ProgressBar;
             progressBar.Height = 20;
             try
             {
                 Progress<int> progress = new Progress<int>();
                 progress.ProgressChanged += (sender, args) =>
                   {
                       progressBar.Value = args;
                   };
                 await TaskEx.Run(() =>
                 {
                     BeginImportNewStudents(progress);
                 });
             }
             finally
             {
                 splan.Close();
                 progressBar.Height = 0;
                 progressBar.Value = 0;
             }
         }
     }
 }