死活无法赋值,我快疯掉了.....模板列的单选按钮 马上要要的.....

Question

string examTypeWill = ds.Tables["student"].Rows[0]["examTypeWill"].ToString();
                RadioButton rbtnLiKe = new RadioButton();
                rbtnLiKe = (RadioButton)(e.Row.Cells[2].FindControl("rbtnLiKe"));
                rbtnLiKe.Checked = false;
                RadioButton rbtnWenKe = new RadioButton();
                rbtnWenKe = (RadioButton)(e.Row.Cells[2].FindControl("rbtnWenKe"));
                rbtnWenKe.Checked = false;
                RadioButton rbtnTeChang = new RadioButton();
                rbtnTeChang = (RadioButton)(e.Row.Cells[2].FindControl("rbtnTeChang"));
                rbtnTeChang.Checked = false;
                if (examTypeWill == "理科")
                {
                    rbtnLiKe.Checked = true;
                    rbtnLiKe.ForeColor = Color.Red;
                }
                else if (examTypeWill == "文科")
                {
                    rbtnWenKe.Checked = true;
                    rbtnWenKe.ForeColor = Color.Red;
                }
                else if (examTypeWill == "特长")
                {
                    rbtnTeChang.Checked = true;
                    rbtnTeChang.ForeColor = Color.Red;
                }
帮我看看为什么不能赋值啊, 我快疯掉了,马上要要的.....

Answer 1

RadioButton rbtnLiKe = new RadioButton();
rbtnLiKe = (RadioButton)(e.Row.Cells[2].FindControl("rbtnLiKe"));
==>
RadioButton rbtnLike=(RadioButton)(e.Row.Cells[2].FindControl("rbtnLiKe"));试试??

Answer 2

错误提示:
  Message="未将对象引用设置到对象的实例。"

Answer 3

加限制没有？
if(e.item.itemindex>=0)

Answer 4

if(e.item.itemindex>=0)
{
string examTypeWill = ds.Tables["student"].Rows[0]["examTypeWill"].ToString();
                RadioButton rbtnLiKe = (RadioButton)(e.Row.Cells[2].FindControl("rbtnLiKe"));
                rbtnLiKe.Checked = false;
                RadioButton rbtnWenKe = (RadioButton)(e.Row.Cells[2].FindControl("rbtnWenKe"));
                rbtnWenKe.Checked = false;
                RadioButton rbtnTeChang = (RadioButton)(e.Row.Cells[2].FindControl("rbtnTeChang"));
                rbtnTeChang.Checked = false;
                if (examTypeWill == "理科")
                {
                    rbtnLiKe.Checked = true;
                    rbtnLiKe.ForeColor = Color.Red;
                }
                else if (examTypeWill == "文科")
                {
                    rbtnWenKe.Checked = true;
                    rbtnWenKe.ForeColor = Color.Red;
                }
                else if (examTypeWill == "特长")
                {
                    rbtnTeChang.Checked = true;
                    rbtnTeChang.ForeColor = Color.Red;
                }
}

Answer 5

Rows[0]是什么。是不是要有个变量i呀？

Answer 6

检查一下你的模板列的单选按钮的name属性是否赋值了，如果不赋值就可能产生这种情况

Answer 7

后台,这里的问题是if(e.item.itemindex>=0) ,谢谢啊.....等会给分

Answer 8

还有一个问题        for (i = 0; i < countRow; i++)
        {
            
            string examTypeWill = null;
            stuSchoolID = this.gvStudent.Rows[i].Cells[0].Text.ToString();
            RadioButton rbtnLiKe = (RadioButton)(this.gvStudent.Rows[i].Cells[2].FindControl("rbtnLiKe"));
            RadioButton rbtnWenKe = (RadioButton)(this.gvStudent.Rows[i].Cells[2].FindControl("rbtnWenKe"));
            RadioButton rbtnTeChang = (RadioButton)(this.gvStudent.Rows[i].Cells[2].FindControl("rbtnTeChang"));
            try
            {
                if (rbtnLiKe.Checked == true)
                {
                    examTypeWill = "理科";
                }
                else if (rbtnWenKe.Checked == true)
                {
                    examTypeWill = "文科";
                }
                else if (rbtnTeChang.Checked == true)
                {
                    examTypeWill = "特长";
                } 
                cmd.CommandText = "update student set examTypeWill='" + examTypeWill + "' where stuSchoolID='" + stuSchoolID + "'";
                if (cmd.ExecuteNonQuery() > 0)
                {
                    countUpdate++;
                }
            }
            catch
            {
                errorCount++;
            }
        }
为什么examTypeWill 始终是第一个?模板列有三个控件...rbtnLiKe,rbtnWenKe,rbtnTeChang