Remove file extension from a file name string

Question

If I have a string saying \"abc.txt\", is there a quick way to get a substring that is just \"abc\"?

I can\'t do an fileName.IndexOf(

Answer 1

    /// <summary>
    /// Get the extension from the given filename
    /// </summary>
    /// <param name="fileName">the given filename ie:abc.123.txt</param>
    /// <returns>the extension ie:txt</returns>
    public static string GetFileExtension(this string fileName)
    {
        string ext = string.Empty;
        int fileExtPos = fileName.LastIndexOf(".", StringComparison.Ordinal);
        if (fileExtPos >= 0)
            ext = fileName.Substring(fileExtPos, fileName.Length - fileExtPos);

        return ext;
    }

Answer 2

This implementation should work.

string file = "abc.txt";
string fileNoExtension = file.Replace(".txt", "");

Answer 3

There's a method in the framework for this purpose, which will keep the full path except for the extension.

System.IO.Path.ChangeExtension(path, null);

If only file name is needed, use

System.IO.Path.GetFileNameWithoutExtension(path);

Answer 4

If you want to create full path without extension you can do something like this:

Path.Combine( Path.GetDirectoryName(fullPath), Path.GetFileNameWithoutExtension(fullPath))

but I'm looking for simpler way to do that. Does anyone have any idea?

Answer 5

You maybe not asking the UWP api. But in UWP, file.DisplayName is the name without extensions. Hope useful for others.

Answer 6

You can use

string extension = System.IO.Path.GetExtension(filename);

And then remove the extension manually:

string result = filename.Substring(0, filename.Length - extension.Length);