Question

借助之前发布的答案（How to add objects to a RadioButtonList based on random order ?），我可以随机顺序将项目添加到RadioButtonList。

然而，它嵌套在一个循环中，所以我将如何重置＆＃39;此订单不会按照此屏幕上限（http://imgur.com/goFNfG2）显示的顺序添加后续商品。

try
{
    conn.Open();

    string cmdText = "SELECT * FROM questions ORDER BY RAND() LIMIT 5";
    MySqlCommand cmd = new MySqlCommand(cmdText, conn);

    reader = cmd.ExecuteReader();
    int i = 0;
    while (reader.Read())
    {
        if (!(list.Contains(reader["question_id"].ToString())))
        {
            list.Add(reader["question_id"].ToString());
            ((Label)this.FindControl("lblQuestion" + (i + 1))).Text = reader["question"].ToString();
            Random ran = new Random();
            var numbers = Enumerable.Range(1, 5).OrderBy(j => ran.Next()).ToList();

            List<ListItem> ans = new List<ListItem>();
            ans.Add(new ListItem(reader["answer1"].ToString(), "y"));
            ans.Add(new ListItem(reader["answer2"].ToString(), "n1"));
            ans.Add(new ListItem(reader["answer3"].ToString(), "n2"));
            ans.Add(new ListItem(reader["answer4"].ToString(), "n3"));
            ans.Add(new ListItem(reader["answer5"].ToString(), "n4"));

            foreach (int num in numbers)
            {
                ((RadioButtonList)this.FindControl("rblAnswers" + (i + 1))).Items.Add(ans[num - 1]);
            }
            i++;
        }
    }
    reader.Close();
}
catch
{
    lblError.Text = "Database connection error - failed to insert record.";
}
finally
{
    conn.Close();
}

Answer 1

你应该初始化变量＆＃34; ran＆＃34;在循环之外。而且，您应该在构造函数中传递种子，如下所示：

Random ran = new Random(Guid.NewGuid().GetHashCode());

以随机顺序将对象添加到RadioButtonList？

1 个答案: