asp.net - 将数据库值插入字符串数组 - 不起作用

Question

干杯，

我正在尝试将数据库值插入到我的字符串数组中。

出于某种原因，它说:

"Object reference not set to an instance of an object."

这是我的代码:

if (IsPostBack)
{
    if (RadioWords.Checked == true)
    {
        con = new SqlConnection("Data Source=MICROSOF-58B8A5\\SQL_SERVER_R2;Initial Catalog=Daniel;Integrated Security=True");
        con.Open();

        string SqlCount = "SELECT COUNT(*) FROM WordGame";

        SqlCommand command = new SqlCommand(SqlCount, con);

        //Sets an array of the size of the database.
        int count = (Int32)command.ExecuteScalar();
        arrOfWords = new string[count];

        //Initialize the words in the array.
        for (int i = 0; i < arrOfWords.Length; i++)
        {
            int GetRandomNumber =  rnd.Next(1, arrOfWords.Length);

            string Sqlinsert = "SELECT Word FROM WordGame WHERE ID='"+GetRandomNumber+"'";

            SqlCommand commandToRandom = new SqlCommand(Sqlinsert, con);

            arrOfWords[i] = commandToRandom.ExecuteScalar().ToString();
        }
    }

及其引用这一行:

int GetRandomNumber =  rnd.Next(1, arrOfWords.Length);

感谢各位的帮助!

Answer 1

rnd 为 null ，添加一行

rnd = new Random();

事件开始时