c#中检测到不可达代码

Question

这个代码显示了不可访问的代码，是我在这里遗漏了什么吗?我正在使用c#和ASP.NET。当我运行这个代码响应。重定向("上传Process.aspx ?QuizID=" + id + ");千万别到这儿来。

   if (Page.IsValid)
        {
            string number = ddlNumber.SelectedValue.ToString();
            string title = txtTitle.Text;
            string level = txtLevel.Text;
            string duration = txtDuration.Text;
            Quiz m = new Quiz
            {
                NumberOfQuestion = int.Parse(number),
                Title = title,
                Level = char.Parse(level),
                Duration = int.Parse(duration)
            };
            db.Quizs.InsertOnSubmit(m);
            db.SubmitChanges();
            string id ="";
            var q = from Quiz in db.Quizs where Quiz.Title == title select Quiz;
            foreach(var p in q)
            {
                id = p.QuizID.ToString();
            }
            for (int a = 0; 0 < int.Parse(number); a++)
            {
                Question o = new Question
                {
                    QuizID = int.Parse(id)
                };
                db.Questions.InsertOnSubmit(o);
                db.SubmitChanges();
            }
            Response.Redirect("Upload Process.aspx?QuizID=" + id + "");
        }

Answer 1

注意number在这个循环中从来没有改变过

for (int a = 0; 0 < int.Parse(number); a++)
{
    Question o = new Question
    {
        QuizID = int.Parse(id)
    };
    db.Questions.InsertOnSubmit(o);
    db.SubmitChanges();
}

如果0 < int.Parse(number)在循环开始时为真，则在循环继续执行时它将继续为真

Answer 2

你确定不是

for (int a = 0; a < int.Parse(number); a++)

想想看，0什么时候会>= than number?