DataGrid.OnMouseDown(MouseEventArgs) 方法

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

引發 MouseDown 事件。

protected:
 override void OnMouseDown(System::Windows::Forms::MouseEventArgs ^ e);

protected override void OnMouseDown (System.Windows.Forms.MouseEventArgs e);

override this.OnMouseDown : System.Windows.Forms.MouseEventArgs -> unit

Protected Overrides Sub OnMouseDown (e As MouseEventArgs)

參數

e

MouseEventArgs

包含關於 MouseEventArgs 事件資料的 OnMouseDown(MouseEventArgs)。

範例

下列程式碼範例示範此成員的使用。

public ref class MyDataGrid: public DataGrid
{
protected:

   // Override the OnMouseDown event to select the whole row
   // when the user clicks anywhere on a row.
   virtual void OnMouseDown( MouseEventArgs^ e ) override
   {
      
      // Get the HitTestInfo to return the row and pass
      // that value to the IsSelected property of the DataGrid.
      DataGrid::HitTestInfo ^ hit = this->HitTest( e->X, e->Y );
      if ( hit->Row < 0 )
               return;

      if ( this->IsSelected( hit->Row ) )
               UnSelect( hit->Row );
      else
               Select(hit->Row);
   }
};

public class MyDataGrid : DataGrid 
{
    // Override the OnMouseDown event to select the whole row
    // when the user clicks anywhere on a row.
    protected override void OnMouseDown(MouseEventArgs e) 
    {
        // Get the HitTestInfo to return the row and pass
        // that value to the IsSelected property of the DataGrid.
        DataGrid.HitTestInfo hit = this.HitTest(e.X, e.Y);
        if (hit.Row < 0)
            return;
        if (this.IsSelected(hit.Row))
            UnSelect(hit.Row);
        else
            Select(hit.Row);
    }
}

Public Class MyDataGrid
    Inherits DataGrid

    ' Override the OnMouseDown event to select the whole row
    ' when the user clicks anywhere on a row.

    Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs)
    ' Get the HitTestInfo to return the row and pass
    ' that value to the IsSelected property of the DataGrid.
        Dim hit As DataGrid.HitTestInfo = Me.HitTest(e.X, e.Y)
        If hit.Row < 0 Then
            Return
        End If
        If IsSelected(hit.Row) Then
            UnSelect(hit.Row)
        Else
            [Select](hit.Row)
        End If
    End Sub
End Class

備註

引發事件會透過委派叫用此事件處理常式。 如需概觀，請參閱 處理和引發事件。

給繼承者的注意事項

在衍生類別中覆 OnMouseDown(MouseEventArgs) 寫時，請務必呼叫基類的 OnMouseDown(MouseEventArgs) 方法。