如何纠正我这个错误 [英] how to rectify i this error

问题描述

RadioButtonList r = default(RadioButtonList);
		r = (RadioButtonList)v.FindControl("RadioButtonList1");
		r.Items.Clear();
		
       r.Items.Add(dt.Rows[ctr]["choice1"]);
       r.Items.Add(dt.Rows[ctr]["choice1"]);
        r.Items.Add(dt.Rows[ctr]["choice3"]);
        r.Items.Add(dt.Rows[ctr]["choice4"]);
       dt.Rows[ctr]["selected"]=r.SelectedIndex;

        



		Session["ctr"] = ctr;
	}

我收到错误r.Items.Add(dt.Rows [ctr] ["choice1"]);


感谢您的宝贵重播.

I got the error r.Items.Add(dt.Rows[ctr]["choice1"]);


Thank u for your valuable replay

推荐答案

它们的代码可能有多个问题.

我几乎看不到如下.

1)RadioButtonList的Delcare对象，如下所示.

Their can be multiple issues with your code.

Few which I can see are as below.

1) Delcare object of RadioButtonList as below.

RadioButtonList r = new RadioButtonList();

2)在添加Items时使用以下语法.

2) Use below syntax while adding Items.

r.Items.Add(dt.Rows[ctr]["choice1"].ToString());

还要调试代码，并检查您的dt不是null并在其中包含行.

Also debug your code and check your dt is not null and has Rows in it.

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