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如何：响应 Windows 窗体 DataGrid 控件中的单击

注释

DataGridView 控件替换并添加 DataGrid 控件的功能;但是，如果选择，则保留 DataGrid 控件以实现后向兼容性和将来使用。 有关详细信息，请参阅 Windows 窗体 DataGridView 控件与 DataGrid 控件之间的区别。

Windows 窗体 DataGrid 连接到数据库后，可以监测用户点击了哪个单元格。

检测 DataGrid 的用户何时选择不同的单元格

  • 在事件处理程序中 CurrentCellChanged ，编写代码以适当响应。

    Private Sub myDataGrid_CurrentCellChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles myDataGrid.CurrentCellChanged
   MessageBox.Show("Col is " & myDataGrid.CurrentCell.ColumnNumber _
      & ", Row is " & myDataGrid.CurrentCell.RowNumber _
      & ", Value is " & myDataGrid.Item(myDataGrid.CurrentCell))
End Sub

    private void myDataGrid_CurrentCellChanged(object sender,
System.EventArgs e)
{
   MessageBox.Show ("Col is " + myDataGrid.CurrentCell.ColumnNumber
      + ", Row is " + myDataGrid.CurrentCell.RowNumber
      + ", Value is " + myDataGrid[myDataGrid.CurrentCell] );
}

    （Visual C#）将以下代码置于表单的构造函数中以注册事件处理程序。

    this.myDataGrid.CurrentCellChanged += new
   System.EventHandler(this.myDataGrid_CurrentCellChanged);

要确定用户单击了 DataGrid 的哪个部分

  • 在适当的事件处理程序中调用 HitTest 方法，比如针对 MouseDown 或 Click 事件。

    该方法 HitTest 返回一个 DataGrid.HitTestInfo 对象，该对象包含单击区域的行和列。

    Private Sub myDataGrid_MouseDown(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles myDataGrid.MouseDown
   Dim myGrid As DataGrid = CType(sender, DataGrid)
   Dim hti As System.Windows.Forms.DataGrid.HitTestInfo
   hti = myGrid.HitTest(e.X, e.Y)
   Dim message As String = "You clicked "

   Select Case hti.Type
      Case System.Windows.Forms.DataGrid.HitTestType.None
         message &= "the background."
      Case System.Windows.Forms.DataGrid.HitTestType.Cell
         message &= "cell at row " & hti.Row & ", col " & hti.Column
      Case System.Windows.Forms.DataGrid.HitTestType.ColumnHeader
         message &= "the column header for column " & hti.Column
      Case System.Windows.Forms.DataGrid.HitTestType.RowHeader
         message &= "the row header for row " & hti.Row
      Case System.Windows.Forms.DataGrid.HitTestType.ColumnResize
         message &= "the column resizer for column " & hti.Column
      Case System.Windows.Forms.DataGrid.HitTestType.RowResize
         message &= "the row resizer for row " & hti.Row
      Case System.Windows.Forms.DataGrid.HitTestType.Caption
         message &= "the caption"
      Case System.Windows.Forms.DataGrid.HitTestType.ParentRows
         message &= "the parent row"
   End Select

   Console.WriteLine(message)
End Sub

    private void myDataGrid_MouseDown(object sender,
System.Windows.Forms.MouseEventArgs e)
{
   DataGrid myGrid = (DataGrid) sender;
   System.Windows.Forms.DataGrid.HitTestInfo hti;
   hti = myGrid.HitTest(e.X, e.Y);
   string message = "You clicked ";

   switch (hti.Type)
   {
      case System.Windows.Forms.DataGrid.HitTestType.None :
         message += "the background.";
         break;
      case System.Windows.Forms.DataGrid.HitTestType.Cell :
         message += "cell at row " + hti.Row + ", col " + hti.Column;
         break;
      case System.Windows.Forms.DataGrid.HitTestType.ColumnHeader :
         message += "the column header for column " + hti.Column;
         break;
      case System.Windows.Forms.DataGrid.HitTestType.RowHeader :
         message += "the row header for row " + hti.Row;
         break;
      case System.Windows.Forms.DataGrid.HitTestType.ColumnResize :
         message += "the column resizer for column " + hti.Column;
         break;
      case System.Windows.Forms.DataGrid.HitTestType.RowResize :
         message += "the row resizer for row " + hti.Row;
         break;
      case System.Windows.Forms.DataGrid.HitTestType.Caption :
         message += "the caption";
         break;
      case System.Windows.Forms.DataGrid.HitTestType.ParentRows :
         message += "the parent row";
         break;
      }

      Console.WriteLine(message);
}

    （Visual C#）将以下代码置于表单的构造函数中以注册事件处理程序。

    this.myDataGrid.MouseDown += new
   System.Windows.Forms.MouseEventHandler
   (this.myDataGrid_MouseDown);

另请参阅