C# 右鍵菜單 contextMenuStrip

1.添加contextMenuStrip控件 默認命名：contextMenuStrip1

2.在要顯示的控件上，找到其ContextMenuStrip屬性，並設置其為contextMenuStrip1

比如我這邊放在 dataGridView1 控件上，就將dataGridView1的ContextMenuStrip屬性，設置為contextMenuStrip1

3.將dataGridView1的CellMouseDown事件下寫入下列代碼

        //在右鍵點擊時，將當前行選中
        private void dataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Right && e.RowIndex >= 0)
            {
                if (!dataGridView1.Rows[e.RowIndex].Selected)
                {
                    dataGridView1.ClearSelection();
                    dataGridView1.Rows[e.RowIndex].Selected = true;
                }
                contextMenuStrip1.Show(MousePosition.X, MousePosition.Y);
            }
        }

4.為ToolStripMenuItem 控件添加Click事件

        private void 刪除ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //獲取當前選中行的索引t22
            int selectRow = dataGridView1.CurrentRow.Index;
            if (selectRow < 0)
                return;
        }