String LastIndexOf bug ?

  • Thread starter Thread starter Ivar
  • Start date Start date
I

Ivar

Hi,

string s = "aXXa";
Console.WriteLine(s.LastIndexOf("XX",0));
Console.WriteLine(s.LastIndexOf("XX"));
Console.WriteLine(s.IndexOf("XX",0));
Console.WriteLine(s.IndexOf("XX"));

Result:
-1 (LastIndexOf must also return 1, but gives -1) Is it a bug ?
1 - ok
1 - ok
1 - ok

In documentation it says:
Reports the index position of the last occurrence of a specified String
within this instance. The search starts at a specified character position.
 
No it's not a bug: The LastIndexOf() search works backwards from the
position specified. Hence there is no match for XX from 0.

Hi,

string s = "aXXa";
Console.WriteLine(s.LastIndexOf("XX",0));
Console.WriteLine(s.LastIndexOf("XX"));
Console.WriteLine(s.IndexOf("XX",0));
Console.WriteLine(s.IndexOf("XX"));

Result:
-1 (LastIndexOf must also return 1, but gives -1) Is it a bug ?
1 - ok
1 - ok
1 - ok

In documentation it says:
Reports the index position of the last occurrence of a specified String
within this instance. The search starts at a specified character position.
 
The search begins at the startIndex character position of this instance and
precedes backwards towards the beginning until either value is found or the
Click to expand...
Yes I see now.
 
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