怎么才能选中datagridview 中的checkbox????

Question

有个datagridview第一列是checkbox，但是没有能得到绑定数据,想在绑定数据后，再一行行判断是否应该选中，但是怎么选中？？下面这方法试了，不行？？求教高人？？？？？？？
string sql = "SELECT * FROM 课程";
            SqlMethod.bindDataGridView(dataGridView1 ,sql,"课程",ConnectionCom .getConnection());
            int sum = dataGridView1.Rows.Count;
            StringCom.showInformation(sum.ToString());
            for (int i = 0; i < sum;i++ )
            {
               //string courceid= dataGridView1.Rows[i].Cells[1].Value.ToString();
               ////StringCom.showInformation(courceid);
               ////StringCom.showInformation(temp.ToString());
               //if (ConnectionCom.IsHaveSelectCource(stuNumber, Convert .ToInt32(courceid)))
               //{                   DataGridViewCheckBoxCell checkcell = (DataGridViewCheckBoxCell)dataGridView1.Rows[i].Cells[0];
                   checkcell.Value = true;
               //}

Answer 1

 for (int i = 0; i < this.dataGridView1.Rows.Count; i++)
                {                   
                    if (this.dataGridView1.Rows[i].Cells[0].EditedFormattedValue.ToString().Trim() == "True")
                    {
                    }
                }
试试这个行吧!

Answer 2

选择列在第几列这里Cells[n] n就是数字几,注意下标是从零开始的!

Answer 3

上面的兄弟，主要是主怎么手动设置没有绑定数据的这个checkbox怎么让其打上钩？处于选中状态？？？？？？？

Answer 4

EditedFormattedValue只是个只读属性，？？？？

Answer 5

this.dataGridView1.EndEdit();
试试

Answer 6

好了，还是我这方法不错，开始不是有一个没有数据的么？？我生成个column放进去不就得了，后来如果选中了，看看数据中有没有，没有就插入，而没选中，也看看数据中有没有，有就删除！！！感谢大家支持！！！！！！！
namespace 学籍管理系统
{
    public partial class SelectCource : Form
    {
        private string stuNumber;
        public SelectCource(string stuNum)
        {
            InitializeComponent();
            stuNumber = stuNum;
            GP.Text = stuNum+"的选课信息";
            bindDataGridView();
        }
        protected void bindDataGridView()
        { 
            string sql = "SELECT * FROM 课程";
            DataTable dt = SqlMethod.ReturnDataTable(ConnectionCom .getConnection (),sql,"课程");
            DataColumn dc = new DataColumn("select",System.Type.GetType("System.Boolean"));
            dt.Columns.Add(dc);
            dc.SetOrdinal(1);
            int sum = dataGridView1.Rows.Count;
            //StringCom.showInformation(sum.ToString());
            for (int i = 0; i < dt.Rows.Count;i++ )
            {
               string courceid= dt.Rows[i]["课程编号"] .ToString();
               //StringCom.showInformation(courceid);
               //StringCom.showInformation(temp.ToString());
               if (ConnectionCom.IsHaveSelectCource(stuNumber, Convert.ToInt32(courceid)))
               {
                   dt.Rows[i]["select"] = true;
               }
               else
               {
                   dt.Rows[i]["select"] = false;
               }
            }
            dataGridView1.DataSource = dt;
        }        private void SelectCource_Load(object sender, EventArgs e)
        {        }        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                int sum = dataGridView1.Rows.Count;
                for (int i = 0; i < sum; i++)
                {
                    //StringCom.showInformation(dataGridView1.Rows[i].Cells[0].Value.ToString());
                    int courseid = Convert.ToInt32(dataGridView1.Rows[i].Cells[0].Value.ToString());
                    //StringCom.showInformation(this.dataGridView1.Rows[i].Cells[1].EditedFormattedValue.ToString().Trim());
                    if (this.dataGridView1.Rows[i].Cells[1].EditedFormattedValue.ToString().Trim() == "True")
                    {
                        if (!ConnectionCom.IsHaveSelectCource(stuNumber, courseid))
                        {
                            string sql = " insert into 选课(学号,课程编号) values(" + StringCom.QuoteStr(stuNumber) + "," + courseid + ")";
                            SqlMethod.InsertUpdateDeleteToDataBase(ConnectionCom.getConnection(), sql);
                        }
                    }
                    else
                    {
                        if (ConnectionCom.IsHaveSelectCource(stuNumber, courseid))
                        {
                            string sql = " delete from  选课 where 学号=" + StringCom.QuoteStr(stuNumber) + " and 课程编号=" + courseid;
                            SqlMethod.InsertUpdateDeleteToDataBase(ConnectionCom.getConnection(), sql);
                        }
                    }
                }
                StringCom.showInformation("保存成功！");
                this.Dispose();
            }
            catch (Exception err)
            {
                StringCom.showInformation(err.Message);
            }
        }
    }
}