C# winform datagridview 增加全選功能

datagridview加上全選功能，

網路大神的寫法，

紀錄並學習。

初始化時加入

public Form1()
        {
            InitializeComponent();
             
            //加入全選
            ckeckboxSelectAll .dgv = dataGridView1;                
            ckeckboxSelectAll .AddSelectAllcheckbox();   
        }

cb.Location 調整參數到指定位置

public class ckeckboxSelectAll 
        {
            public static System.Windows.Forms.DataGridView dgv;
            
            public static void AddSelectAllcheckbox()
            {
                System.Windows.Forms.CheckBox cb= new System.Windows.Forms.CheckBox();
                cb.Text = "";
                cb.Checked = false;
                System.Drawing.Rectangle rect = dgv.GetCellDisplayRectangle(0, -1, true);
                cb.Size = new System.Drawing.Size(13, 13);
                cb.Location = new Point(rect.Location.X + dgv.Columns[0].Width - 55, rect.Location.Y + 3);
                cb.CheckedChanged += new EventHandler(cb_CheckedChanged);
                dgv.Controls.Add(cb);
            }
            
            static void cb_CheckedChanged(object sender, EventArgs e)
            {
                for (int i = 0; i < dgv.Rows.Count; i++)
                {
                    dgv.Rows[i].Cells[0].Value = ((System.Windows.Forms.CheckBox)sender).Checked;
                }
                dgv.EndEdit();
            }
            
        }