SubString StringBuilder c#

Question

I'm trying :

1  string pal = "Juan     1David     1Correa";
2  StringBuilder sb = new StringBuilder(pal);
3  Console.writeline( sb.ToString(0,9) );
4  Console.writeline( sb.ToString(10,14) );
5  Console.writeline( sb.ToString(15,26) );

But in the 4 line It throws an exception.

Why?

Answer 1

The second argument to StringBuilder.ToString(int, int) represents the length of the desired sub-string, not its end-index.

Retrieves a substring from this instance. The substring starts at a specified character position and has a specified length.

For example, the last statement should probably be:

Console.WriteLine(sb.ToString(15, 12));

On another note, If all you want is to get sub-strings from the original string, you could just use the String.Substring(int, int) method.

Answer 2

Second parameter is length, so it should be

Console.writeline( sb.ToString(10,5) );

Answer 3

The docs clearly state that ArgumentOutOfRangeException will be thrown when "The sum of startIndex and length is greater than the length of the current instance."

Answer 4

Second parameter is length but not a last index. So in your case 15+26 = 41 which is out of the bounds.