如何让contextMenuStrip有条件的显示

[kelei12399]

winform里，我想让contextMenuStrip在datagridview里在数据行里显示右键功能。，无数据的行不出现右键的快捷方式

如何实现，多谢

[mngzilin]

MouseDwon事件

if(e.Button==鼠标右键&&datagridview.SelectedRows.Count>0)
{
//显示
}

[zzx509]

  private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
        {
            Point p=dataGridView1.PointToClient(MousePosition);
            System.Windows.Forms.DataGridView.HitTestInfo hitInfo=dataGridView1.HitTest(p.X, p.Y);
            if (hitInfo.RowIndex < 0 || hitInfo.ColumnIndex < 0||(dataGridView1[hitInfo.ColumnIndex, hitInfo.RowIndex].Value == null ))
            {
                e.Cancel = true;
            }
          
        }

[捷哥1999]

首先不要给DataGridView设置ContextMenuStrip，然后这样：

        private void dataGridView1_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                if (e.RowIndex != -1 && dataGridView1.Rows[e.RowIndex].Cells[0] != null)
                {
                    Point p = dataGridView1.PointToClient(Cursor.Position);
                    this.contextMenuStrip1.Show(dataGridView1, p);
                }
            }
        }