C# DataGridView 右键单击​​到 ContextMenu 单击检索单元格值

Question

我有一个 DataGridView。在我的 DataGridView 的第 4 列中右键单击单元格时，我创建了一个 ContextMenuStrip。然而，我被卡住了，因为在左键单击 ContextMenuStrip 菜单项时，我想从右键单击的单元格中提取数据。

我想要的单元格是 ContextMenuStrip 的左上角，它正是我右键单击的位置，并指向我想要获取数据的单元格。 The screen grab just doesn't show the mouse cursor.

这是我目前所拥有的:

GridView1.MouseDown += new MouseEventHandler(this.dataGridView_MouseDown);

private void dataGridView_MouseDown(object sender, MouseEventArgs e)
    {

        if (e.Button == MouseButtons.Right)
        {
            var ht = dataGridView1.HitTest(e.X, e.Y);

            //Checks for correct column index
            if (ht.ColumnIndex == 4 && ht.RowIndex != -1)
            {
                //Create the ContextStripMenu for Creating the PO Sub Form
                ContextMenuStrip Menu = new ContextMenuStrip();
                ToolStripMenuItem MenuOpenPO = new ToolStripMenuItem("Open PO");
                MenuOpenPO.MouseDown += new MouseEventHandler(MenuOpenPO_Click);
                Menu.Items.AddRange(new ToolStripItem[] { MenuOpenPO });

                //Assign created context menu strip to the DataGridView
                dataGridView1.ContextMenuStrip = Menu;
            }

            else
                dataGridView1.ContextMenuStrip = null;
        }
    }

I think this post may be what I am looking for

但是如果我改变:private void dataGridView_MouseDown(object sender, MouseEventArgs e) 到

private void dataGridView_MouseDown(object sender, DataGridViewCellMouseEventArgs e)

我不确定如何更改 GridView1.MouseDown += new MouseEventHandler(this.dataGridView_MouseDown); 所以我没有收到错误消息。或者有更好的方法吗？

最终解决方案 在 Gjeltema 的帮助下

dataGridView1.CellMouseDown += this.dataGridView1_CellMouseDown;

    private void dataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
    {
        //Checks for correct column index
        if (e.Button == MouseButtons.Right && e.ColumnIndex == 4 && e.RowIndex != -1)
        {
            //Create the ContextStripMenu for Creating the PO Sub Form
            ContextMenuStrip Menu = new ContextMenuStrip();
            ToolStripMenuItem MenuOpenPO = new ToolStripMenuItem("Open PO");
            MenuOpenPO.MouseDown += new MouseEventHandler(MenuOpenPO_Click);
            Menu.Items.AddRange(new ToolStripItem[] { MenuOpenPO });

            //Assign created context menu strip to the DataGridView
            dataGridView1.ContextMenuStrip = Menu;
            CellValue = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
        }

        else
            dataGridView1.ContextMenuStrip = null;
    }

Answer 1

如果您要使用该帖子的解决方案，请注意他订阅的是 CellMouseDown 事件，而不是 MouseDown 事件。这具有不同的签名。

此外，从 .Net 2.0 开始，您不需要所有的委托(delegate)包装语法，您只需 += 匹配事件委托(delegate)签名的函数，如下所示:

// Your updated MouseDown handler function with DataGridViewCellMouseEventArgs
GridView1.CellMouseDown += this.dataGridView_MouseDown;

这样你就不会看到错误信息了，就可以按照你在帖子中看到的去做了。