如何：响应 Windows 窗体 DataGrid 控件中的单击

更新：2007 年 11 月

说明：
DataGridView 控件替换了 DataGrid 控件并添加了功能；但是也可选择保留 DataGrid 控件以备向后兼容和将来使用。有关更多信息，请参见 Windows 窗体 DataGridView 控件和 DataGrid 控件之间的区别。

当 Windows 窗体 DataGrid 连接到数据库后，您可以监视用户单击的单元格。

检测 DataGrid 的用户何时选择另一个单元格

• 在 CurrentCellChanged 事件处理程序中，编写代码进行适当地响应。

  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#) 在窗体的构造函数中放置以下代码以注册事件处理程序。

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

确定用户所单击的 DataGrid 部分

• 在适当的事件处理程序（例如 MouseDown 或 Click 事件处理程序）中调用 HitTest 方法。

  HitTest 方法返回包含所单击区域的行和列的 DataGrid.HitTestInfo 对象。

  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#) 在窗体的构造函数中放置以下代码以注册事件处理程序。

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

请参见

任务

如何：在运行时更改 Windows 窗体 DataGrid 控件中显示的数据

其他资源

DataGrid 控件（Windows 窗体）