获取WPF的DataGrid控件中，是否存在没有通过错误验证的Cell

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/// <summary>         /// 获取DataGrid的所有行是否存在验证错误。         /// </summary>         /// <param name="dg">要检查的DataGrid实例</param>         /// <returns>true 有错，false 无错</returns>         public static bool GetDataGridRowsHasError(DataGrid dg)         {             bool hasError = false ;             for (int i = 0; i < dg.Items.Count; i++)             {                 DependencyObject o = dg.ItemContainerGenerator.ContainerFromIndex(i);                 hasError = Validation.GetHasError(o);                 if (hasError)                 {                     break;                 }             }             return hasError;         }

判断有验证错误 就不执行提交。

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/// <summary>         /// 获取DataGrid的第一个被发现的验证错误结果。         /// </summary>         /// <param name="dg">被检查的DataGrid实例。</param>         /// <returns>错误结果。</returns>         public static ValidationError GetDataGridRowsFirstError(DataGrid dg)         {             ValidationError err=null;             for (int i = 0; i < dg.Items.Count; i++)             {                 DependencyObject o = dg.ItemContainerGenerator.ContainerFromIndex(i);                 bool hasError = Validation.GetHasError(o);                 if (hasError)                 {                     err = Validation.GetErrors(o)[0];                     break;                 }             }             return err;         }           /// <summary>         /// 执行检查DataGrid，并提示第一个错误。重新定位到错误单元格。         /// </summary>         /// <param name="dg">被检查的DataGrid实例。</param>         /// <returns>true 有错并定位，false 无错、返回</returns>         public static bool ExcutedCheckedDataGridValidation(DataGrid dg)         {             ValidationError err = GetDataGridRowsFirstError(dg);             if (err != null)             {                 string errColName = ((System.Windows.Data.BindingExpression)err.BindingInError).ParentBinding.Path.Path;                 DataGridColumn errCol = dg.Columns.Single(p =>                 {                     if (((Binding)((DataGridTextColumn)p).Binding).Path.Path == errColName)                         return true;                     else return false;                 });                 //string errRow = ((DataRowView)((System.Windows.Data.BindingExpression)err.BindingInError).DataItem)["SWH"].ToString();                 //dg.Items.IndexOf(((System.Windows.Data.BindingExpression)err.BindingInError).DataItem);                 dg.SelectedItem = ((System.Windows.Data.BindingExpression)err.BindingInError).DataItem;                 int errRowIndex = dg.SelectedIndex;                 MessageBox.Show(string.Format("第"{0}"行 的"{1}"列的单元格数据不合法(以红色标出)，请填写正确后再执行其他操作。", errRowIndex + 1, errCol.Header), "系统消息", MessageBoxButton.OK, MessageBoxImage.Warning);                   dg.CurrentCell = new DataGridCellInfo(dg.SelectedItem, errCol);                 if (!((DataRowView)dg.CurrentItem).IsEdit)                 {                     ((DataRowView)dg.CurrentItem).BeginEdit();                   }                 TextBox txt = dg.CurrentColumn.GetCellContent(dg.CurrentItem) as TextBox;                 txt.Focus();                 return true;             }             else             {                 return false;             }         }