Question

How to remove file extension in C#

Answer 1

using System;
using System.IO;

public static class FileHelper
{
    /// <summary>
    /// Removes the last file extension from a filename or path.
    /// </summary>
    /// <param name="path">
    /// The filename or full path.
    /// </param>
    /// <returns>
    /// The filename/path without its last extension.
    /// </returns>
    /// <exception cref="ArgumentException">
    /// Thrown when the path is null, empty, or whitespace.
    /// </exception>
    ///
    /// Examples:
    /// document.pdf      -> document
    /// archive.tar.gz    -> archive.tar
    /// photo.jpg         -> photo
    /// README            -> README
    /// C:\Temp\file.txt  -> C:\Temp\file
    public static string RemoveFileExtension(string path)
    {
        if (string.IsNullOrWhiteSpace(path)) {
            throw new ArgumentException(
                "Path cannot be null or empty.",
                nameof(path));
        }

        // Get the directory portion (if any).
        string? directory = Path.GetDirectoryName(path);

        // Get the filename without its last extension.
        string fileNameWithoutExtension =
            Path.GetFileNameWithoutExtension(path);

        // If there is no directory, return only the filename.
        if (string.IsNullOrEmpty(directory)) {
            return fileNameWithoutExtension;
        }

        // Reconstruct the path without the extension.
        return Path.Combine(directory, fileNameWithoutExtension);
    }
}

class Program
{
    static void Main()
    {
        Console.WriteLine(
            FileHelper.RemoveFileExtension("document.pdf"));

        Console.WriteLine(
            FileHelper.RemoveFileExtension("archive.tar.gz"));

        Console.WriteLine(
            FileHelper.RemoveFileExtension(@"C:\Temp\file.txt"));

        Console.WriteLine(
            FileHelper.RemoveFileExtension("README"));
    }
}


/*
run:

document
archive.tar
C:\Temp\file
README

*/

 

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Answer 2

using System;
using System.IO;

public static class FileHelper
{
 
    /// <summary>
    /// Removes the last extension from a filename.
    /// </summary>
    public static string RemoveFileExtension(string fileName)
    {
        return Path.GetFileNameWithoutExtension(fileName);
    }
}

class Program
{
    static void Main()
    {
        Console.WriteLine(
            FileHelper.RemoveFileExtension("document.pdf"));

        Console.WriteLine(
            FileHelper.RemoveFileExtension("archive.tar.gz"));

        Console.WriteLine(
            FileHelper.RemoveFileExtension(@"C:\Temp\file.txt"));

        Console.WriteLine(
            FileHelper.RemoveFileExtension("README"));
    }
}


/*
run:

document
archive.tar
C:\Temp\file
README

*/

 

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