DataGridView为表头增加批量选择框

/// <summary>
/// 给DataGridView添加全选
/// </summary>
public class AddCheckBoxToDataGridView
{
public static System.Windows.Forms.DataGridView dgv;
public static void AddFullSelect()
{
if (dgv.Rows.Count < 1)
{
return;
}
System.Windows.Forms.CheckBox ckBox = new System.Windows.Forms.CheckBox();
ckBox.Text = "全选";
ckBox.Checked = true;
System.Drawing.Rectangle rect =
dgv.GetCellDisplayRectangle(0, -1, true);
ckBox.Size = new System.Drawing.Size(dgv.Columns[0].Width, 18);
ckBox.Location = rect.Location;
ckBox.CheckedChanged += new EventHandler(ckBox_CheckedChanged);
dgv.Controls.Add(ckBox);
}
static void ckBox_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();
}
}

AddCheckBoxToDataGridView.dgv = dgvKS_RY;
AddCheckBoxToDataGridView.AddFullSelect();