C#datagridview一次提交多行修改数据

Question

我做好了修改C#datagridview的功能，但是只能每次修改一行，然后选择修改按钮
这样才能保存，如果同时修改多行，就只能保存最后一次修改的结果，可是我想修改多行，然后按修改按钮，能够同时修改多行数据。以下是我修改按钮中的代码：
private void button2_Click_1(object sender, EventArgs e)
{
//计划名称和计划时间
String jihuamingcheng = textBox1.Text;
String jihuashijian = dateTimePicker1.Value.Date.ToLongDateString();
//保存计划

        using (SqlConnection sqlcon = new SqlConnection(strcon))
        {
            sqlcon.Open();
            string id = this.dataGridView1.CurrentRow.Cells[0].Value + "";
            string riqi = this.dataGridView1.CurrentRow.Cells[1].Value + "";
            string neirong = this.dataGridView1.CurrentRow.Cells[2].Value + "";
            string wanchengdu = this.dataGridView1.CurrentRow.Cells[3].Value + "";


          //  string sql = "update " + jihuamingcheng + " set 创建时间='" + jihuashijian + "',内容='" + neirong + "',完成度='" + wanchengdu + "' where 项目号='" + id + "'";
           // SqlCommand command = new SqlCommand(sql, sqlcon);
           // myda = new SqlDataAdapter(command);
            //myset.Tables.Clear();
           // myda.Fill(myset, "" + jihuamingcheng + "");
            //dataGridView1.DataSource = myset.Tables["" + jihuamingcheng + ""];


            if (this.dataGridView1.DataSource != null)
            {
                DialogResult result = MessageBox.Show("确定将此次盘库数据保存至数据库？（存储前请务必核对准确）", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
                if (result == DialogResult.OK)
                {
                    for (int i = 0; i < dataGridView1.Rows.Count-1; i++)
                    {

                        string cmdInsert = String.Empty;
                        cmdInsert = "INSERT INTO " + jihuamingcheng + "(项目号,创建时间,内容,完成度)";
                        cmdInsert += "," + this.dataGridView1.Rows[i].Cells[2].Value + "";
                        cmdInsert += "," + this.dataGridView1.Rows[i].Cells[3].Value + "";

                    }


                }




            }
        }
        //刷新表


        using (SqlConnection sqlcon = new SqlConnection(strcon))
        {
            sqlcon.Open();


            string sql = "select * from "+jihuamingcheng+"";
            SqlCommand command = new SqlCommand(sql, sqlcon);
            myda = new SqlDataAdapter(command);
            myset.Tables.Clear();
            myda.Fill(myset, ""+jihuamingcheng+"");
            dataGridView1.DataSource = myset.Tables[""+jihuamingcheng+""];
        }






    }

Answer 1

1、使用dataGridView本身的功能，与数据源绑定，将更新同步到数据表；
2、自己编写代码检测修改了哪些行，更新到数据表；