c# - is there anything like BeforeLastIndexOf?

Question

I wanted to know if there is anything like "BeforeLastIndexOf". I'm new to c# and don't really know how "LastIndexOf" and "IndexOf" works. What I'm trying to achive is that for example the user types in a directory and it deletes from the string the last folder of this directory but usually directory's look like this "C:\something\something\" and it has a "\" at the end, so a code like this doesn't work:

string input = Console.ReadLine();
int index = input.LastIndexOf("/");
if (index > 0)
     input = input.Substring(0, index + 1);

Cause it deletes only everything after the last "\" and it's anyway at the end so it doesn't delete anything

Answer 1

It looks like you want to:

1. Remove any trailing backslashes, using string.TrimEnd().
2. Call Path.GetDirectoryName() to strip off the last directory.

For example:

string path1 = @"C:\something\something\";
Console.WriteLine(Path.GetDirectoryName(path1.TrimEnd('\\'))); // Prints "C:\something

string path2 = @"C:\something\something";
Console.WriteLine(Path.GetDirectoryName(path2.TrimEnd('\\'))); // Prints "C:\something

If you want to handle / characters too (since that's actually a valid path separator in Windows), you can just specify both in the TrimEnd():

path1.TrimEnd('/', '\\')

Thus:

string path3 = @"C:/something/something//\\/";
Console.WriteLine(Path.GetDirectoryName(path3.TrimEnd('/', '\\'))); // Prints "C:\something