datagridview中加入checkbox列，全选问题

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
         

if (e.RowIndex < 0)
               return;
           string[] SubCode = null;
           string Code = this.dataGridView1.Rows[e.RowIndex].Cells["FunctionCode"].Value.ToString();   //获取当前点击行的FunctionCode的值
           SubCode = Code.Split('_');  //根据FunctionCode中的‘下划线’把FunctionCode分为两部分
           if (Code == SubCode[0])     //如果code(当前选中行的FunctionCode的值)等于被拆分出来的第一个值，则执行下下语句
           {
               if (this.dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString() == "1")   //如果所点击行的第一列checkbox的值为1 ★★
               {
                   for (int i = 0; i < this.dataGridView1.Rows.Count - 1; i++) //循环判断datagridview中的第一行
                   {
                       string CodeA = this.dataGridView1.Rows[i].Cells["FunctionCode"].Value.ToString(); //获取当前循环所在的行的FunctionCode
                       string[] SubCodeA = CodeA.Split('_');   //拆分出两部分
                       if(this.dataGridView1.Rows[i].Cells[0].Value == null)   //因为checkbox不接受null值，会报错，防止获取的null值报错，让其等于0
                       {
                           this.dataGridView1.Rows[i].Cells[0].Value = 0;
                       }
                       if (SubCodeA[0] == Code && this.dataGridView1.Rows[i].Cells[0].Value.ToString() == "1") //如果拆分出的第一部分的值和所点击的行的FunctionCode的值相同，并且当前循环行的checkbox值为1的话，
                       {
                           this.dataGridView1.Rows[i].Cells[0].Value = 0;      //反选为0 -----与上面加‘★★’的地方相反，因为在点击Code之前，checkbox为选中状态，所以点击一次之后，应当为不选中状态
                       }
                   }
               }
               else if (this.dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString() == "0")
               {
                   for (int i = 0; i < this.dataGridView1.Rows.Count - 1; i++)
                   {
                       string CodeA = this.dataGridView1.Rows[i].Cells["FunctionCode"].Value.ToString();
                       string[] SubCodeA = CodeA.Split('_');
                       if (this.dataGridView1.Rows[i].Cells[0].Value == null)
                       {
                           this.dataGridView1.Rows[i].Cells[0].Value = 0;
                       }
                       if (SubCodeA[0] == Code && this.dataGridView1.Rows[i].Cells[0].Value.ToString() == "0")
                       {
                           this.dataGridView1.Rows[i].Cells[0].Value = 1;
                       }
                   }
               }
           }

}

但这样，双击（父节点时），（子节点）只执行一次。  在

private void dataGridView1_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)

事件中，加入相同代码，让其它单击双击都执行相同结果，即可解决。