c# - 在我检查记录后，Reader 无法继续

Question

我已成功检查数据库中是否存在值。

代码如下:

if (!reader.Read())
{
    MessageBox.Show(" Can not find user!");
    reader.Close();
}
else
{
    int count = 0;
    while (reader.Read())
    {
        string user = (string)reader.GetString(0);
        string name = (string)reader.GetString(1);
        int roll = (int)reader.GetInt32(2);
        string phone = (string)reader.GetString(3);
        string address = (string)reader.GetString(4);
        string birthofdate = (string)reader.GetString(5);
        label1.Text = "" + roll;
        label2.Text = name;
        label3.Text = birthofdate;
        label4.Text = "" + phone;
        label5.Text = address;
    }
}

但问题是无论如何都会跳过 while 循环。

Answer 1

替换

if (!reader.Read())

与

if (!reader.HasRows)