C# 如何从动态RadioButtonList数组中获取SelectedValue？

有人能帮我从动态

RadioButtonList

中获取所选值吗？我总是在

选项[x]中获取空值。在我的
按钮中单击
事件，SelectedValue

有人知道如何解决这个问题吗？非常感谢。下面是我的代码：

public static string[] questions;
public static string[] ans;
Random rand = new Random();
string[] option = new string[3];
static int items;
public static Label[] ques;
public static RadioButtonList[] choices;

protected void Page_Load(object sender, EventArgs e)
{

    if (!IsPostBack)
    {               

        GetRandomQuestionClass.Get_No_Of_Items(Convert.ToInt32(Session["user"]));
        items = GetRandomQuestionClass.NO_OF_ITEMS;                                                                                                      GetRandomQuestionClass.LOAD_QUESTION_ID(Session["QuizLessonCategory"].ToString());
        ques = new Label[items];
        questions = new string[items];
        ans = new string[items];
        choices = new RadioButtonList[items];
        for (int x = 0; x < items; x++)
        {
            //int i = 0;
            ques[x] = new Label();
            ques[x].ID = "ques" + x.ToString();
            questions[x] = GetRandomQuestionClass.LOAD_QUESTIONS(x);
            ques[x].Text = Convert.ToString(x + 1) + ".) " + GetRandomQuestionClass.LOAD_QUESTIONS(x);
            choices[x] = new RadioButtonList();
            choices[x].ID = "choices" + x.ToString();

            GetRandomQuestionClass.GET_OPTIONS(x);

            ans[x] = GetRandomQuestionClass.LOAD_ANSWER(x);
            holder.Controls.Add(ques[x]);
            choices[x].Items.Add(new ListItem (GetRandomQuestionClass.LOAD_ANSWER(x)));
            choices[x].Items.Add(new ListItem (GetRandomQuestionClass.OPT1));
            choices[x].Items.Add(new ListItem (GetRandomQuestionClass.OPT2));
            choices[x].Items.Add(new ListItem (GetRandomQuestionClass.OPT3));

            holder.Controls.Add(choices[x]);
        }
    }

}


protected void ButtonSubmit_Click(object sender, EventArgs e)
{
    int score=0;
    for (int x = 0; x < items; x++)
    {
        RadioButtonList rb; 
        //rb=(RadioButtonList)FindControl("choices0");
        rb = (RadioButtonList)Page.FindControl("choices0");
        score = ComputeGradeClass.Score_Counter(ques[x].Text.ToString(),     choices[x].SelectedValue);
    }
    ComputeGradeClass.Grade(score);
}

由于您正在动态创建RadioButtonList控件，因此需要确保在每次回发时生成项目。

否则，服务器将无法理解有关控件的任何信息。您可以在屏幕上看到它们，但无法访问它们

因此，将创建RadioButtonList控件的代码移到外部关闭
如果（！IsPostBack）阻塞，然后重试

编辑
而不是这个

score = ComputeGradeClass.Score_Counter(ques[x].Text.ToString(),     choices[x].SelectedValue);

试一试

按钮单击事件中的更正这应该是代码，但仍然不起作用受保护的无效按钮提交单击（对象发送者，事件参数e）{int score=0；for（int x=0；xscore = ComputeGradeClass.Score_Counter(ques[x].Text.ToString(),     choices[x].SelectedValue);

score = ComputeGradeClass.Score_Counter(ques[x].Text.ToString(), rb.SelectedValue);