c# - 索引(从零开始)必须大于或等于零

Question

嘿，我一直收到错误消息:

Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

我的代码:

OdbcCommand cmd = new OdbcCommand("SELECT FirstName, SecondName, Aboutme FROM User WHERE UserID=1", cn);

OdbcDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
    Name.Text = String.Format("{0} {1}", reader.GetString(0), reader.GetString(1));
    Aboutme.Text = String.Format("{2}", reader.GetString(0));
}

Answer 1

您的第二个 String.Format 使用 {2} 作为占位符，但您只传入一个参数，因此您应该使用 {0} 代替。

改变这个:

String.Format("{2}", reader.GetString(0));

到这里:

String.Format("{0}", reader.GetString(2));