c# QueryString 异常

Question

在下面的代码中，我得到了以下错误。

“System.ArgumentOutOfRangeException”类型的异常发生在 mscorlib.dll 但未在用户代码中处理

附加信息：索引超出范围。必须是非负数 并且小于集合的大小。

代码：

protected void Page_Load(object sender, EventArgs e)
{
    Prid.Text = Request.QueryString[0];
    using (SqlConnection connection = ConnectionManager.GetConnection())
    {
        string cmd = "SELECT ImageColor, Quantity, ProductName, Price, ScreenSize, ScreenType, Processor, Internal_Memory, Ram, SD_Card, Camera, Bettery From Mobtabspecifications WHERE Mobtabspecifications.Prid ='" + Prid.Text+"'";
        SqlCommand command = new SqlCommand(cmd, connection);
        SqlDataReader reader = command.ExecuteReader();
        while (reader.Read())
        { 
            img.ImageUrl = "../image/"+ reader[0] as string;
            Quantity.Text = reader[1] as string;
            PrName.Text = reader[2] as string;
            PrPrice.Text = reader[3] as string;
            SSize.Text = reader[4] as string;
            SType.Text = reader[5] as string;
            Prpower.Text = reader[6] as string;
            Intmemory.Text = reader[7] as string;
            Ram.Text = reader[8] as string;
            sdcard.Text = reader[9] as string;
            Camera.Text = reader[10] as string;
            Bettery.Text = reader[11] as string;
            break;
        }

    }
}

如果我想在那之后激活产品并且我需要通过 id 将产品设置在购物篮中如果有人对此有任何想法，请在评论中告诉我

Answer 1

尝试使用每列的名称：

Quantity.Text = reader["Quantity"] as string;

而不是

Quantity.Text = reader[1] as string;