Index (zero based) must be greater than or equal to zero

Hey I keep getting an error:

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

My code:

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));
}

270357 次浏览

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最佳答案

Your second String.Format uses {2} as a placeholder but you're only passing in one argument, so you should use {0} instead.

Change this:

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

To this:

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

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Change this line:

Aboutme.Text = String.Format("{0}", reader.GetString(0));

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In this line:

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

The token {2} is invalid because you only have one item in the parms. Use this instead:

Aboutme.Text = String.Format("{0}", reader.GetString(0));

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This can also happen when trying to throw an ArgumentException where you inadvertently call the ArgumentException constructor overload

public static void Dostuff(Foo bar)
{


// this works
throw new ArgumentException(String.Format("Could not find {0}", bar.SomeStringProperty));


//this gives the error
throw new ArgumentException(String.Format("Could not find {0}"), bar.SomeStringProperty);


}

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using System;


namespace ConsoleApp1
{
class Program
{
static void Main()
{
Console.WriteLine("Enter Your FirstName ");
String FirstName = Console.ReadLine();


Console.WriteLine("Enter Your LastName ");
String LastName = Console.ReadLine();
Console.ReadLine();


Console.WriteLine("Hello {0}, {1} ", FirstName, LastName);
Console.ReadLine();


}
}
}

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String.Format must start with zero index "{0}" like this:

Aboutme.Text = String.Format("{0}", reader.GetString(0));

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Change this line:

The 2 should be 0. Every count starts at 0.

//Aboutme.Text = String.Format("{2}", reader.GetString(0));//wrong


//Aboutme.Text = String.Format("{0}", reader.GetString(0));//correct