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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for July 20th, 2011

File extension parameters do include a dot

Posted by jpluimers on 2011/07/20

This is from a long time ago, but still fun:

Sometimes simple things in life are hard do remember.

For instance, I always forgot if a file extension parameter should have a dot in it or not.

Normally it should!

But for clearing an extension, you should use a blank string.

Be aware though that empty extensions look differently depending where in the process you look at them:

C# example:

using System;
using System.IO;
public class Test
{
        public static void Main()
        {
                string extensionLess = Path.ChangeExtension(@"C:\mydir\myfile.com.extension", "");
                Console.WriteLine(extensionLess);
                string extension = Path.GetExtension(extensionLess);
                Console.WriteLine(extension);
        }
}

Outputs:

C:\mydir\myfile.com.

Delphi example:

program Demo;
{$APPTYPE CONSOLE}
uses
  SysUtils;
var
  extensionLess: string;
  extension: string;
begin
  extensionLess := ChangeFileExt('C:\mydir\myfile.com.extension', '');
  Writeln(extensionLess);
  extension := ExtractFileExt(extensionLess);
  Writeln(extension);
end.

Outputs:

C:\mydir\myfile.com
.com

Don’t you love differences in your platforms :)

–jeroen

Posted in .NET, C#, C# 2.0, C# 3.0, C# 4.0, Delphi, Development, Software Development | 4 Comments »

 
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