How to remove file extension using C#?

Question

I am trying to remove file extension of a file with many dots in it:

string a = "asdasdasd.asdas.adas.asdasdasdasd.edasdasd";

string b = a.Substring(a.LastIndexOf('.'), a.Length - a.LastIndexOf('.'));

string c = a.Replace(b, "");

Console.WriteLine(c);

Is there any better way of doing this?

Answer 1

If you can, just use Path.GetFileNameWithoutExtension

Returns the file name of the specified path string without the extension.

Path.GetFileNameWithoutExtension("asdasdasd.asdas.adas.asdasdasdasd.edasdasd");

With one line of code you can get the same result.

If you want to create one by yourself, why not just use this?

int index = a.LastIndexOf('.');
b = index == -1 ? a : a.Substring(0, index);

P.S Special thanks to @Anthony and @CompuChip to point me out some mistake i done, bad day maybe.

You take everything which comes from 0 (the start) to the last dot which means the start of the extension

Answer 2

Use the Path class within the namespace System.IO.

Path.GetFileNameWithoutExtension(a);

Answer 3

In your code, you are getting the subsection of the extension, then removing it from the original. Instead you should simply just get the subsection of the string without the extension.

string c = a.Substring(0, a.LastIndexOf('.'));

Edit: Just as stated before me by Marco :D