问题描述

求大神解答，为什么datalist中处理radiobutton的checked时string无法赋值？

代码如下，在最后if (strarm == tmp)判定时编译器老是提醒我tmp的值为空，不能比较，这是为什么呢？
string tmp;
RadioButton A = (RadioButton)DataList1.Items[i].FindControl(""RA"");
RadioButton B = (RadioButton)DataList1.Items[i].FindControl(""RB"");
RadioButton C = (RadioButton)DataList1.Items[i].FindControl(""RC"");
RadioButton D = (RadioButton)DataList1.Items[i].FindControl(""RD"");
Label showre = ((Label)DataList1.Items[i].FindControl(""Label4""));
string strarm = ((Label)DataList1.Items[i].FindControl(""Label3"")).Text.Trim();
if (A.Checked)
{
tmp = ""A"";

        }        else if (B.Checked)        {            tmp = ""B"";        }        else if (C.Checked)        {            tmp = ""C"";        }        else if (D.Checked)        {            tmp = ""D"";        }        if (strarm == tmp)//问题所在，提示tmp是null        {            score = score + 1;        }

解决方案

你有DEBUG过你的代码么?