Remove characters after the last appearance of a delimiter in a string

Question

Is there a way to remove the characters in a string after the last occurrence of a delimiter?

I have looked into the following questions.

Split string by last separator - In this case, the characters before the last occurrence are omitted. But I just need the opposite of this.

Remove last characters from a string in C#. An elegant way? - Here the characters after the first occurrence of the delimiter are removed.

For e.g. I have a string

"D:\dir1\subdir1\subdir11\subdir111\file1.txt"

The result I expect is

"D:\dir1\subdir1\subdir11\subdir111"

Note: This is just an example. I need a solution to work in other cases too.

Answer 1

You can use the String.Remove() method.

string test = @"D:\dir1\subdir1\subdir11\subdir111\file1.txt";
string result = test.Remove (test.LastIndexOf ('\\'));

The value stored in result will be

"D:\dir1\subdir1\subdir11\subdir111"

Answer 2

You can easily achieve this using LastIndexOf

string str =@"D:\dir1\subdir1\subdir11\subdir111\file1.txt"
str= str.SubString(0,str.LastIndexOf("\\"));

If you are looking for something generic then create extension method

public static string GetStringBeforeLastIndex(this string str,string delimeter)
{
  return str.SubString(0,str.LastIndexOf(delimeter));
}

Now you just have to call the method

string str =@"D:\dir1\subdir1\subdir11\subdir111\file1.txt"
    str = str.GetStringBeforeLastIndex("\\"); you can pass any delimeter

 string str =@"asdd-asdasd-sdfsdf-hfghfg"
        str = str.GetStringBeforeLastIndex("-");

Answer 3

this should be the safest way

string Pathname = @"D:\dir1\subdir1\subdir11\subdir111\file1.txt";
string Result = Path.GetDirectoryName(Pathname);