FileUtilities.cs

using System;
using System.Diagnostics;
using System.IO;

namespace Stuff
{
    public static class FileUtilities
    {
        /// <summary>
        /// Will attempt to create the path for a file if it doesn't exist
        /// </summary>
        /// <param name="path"></param>
        public static void CreateDirectoryForFile(string path)
        {
            var directory = Path.GetDirectoryName(path);

            if (!string.IsNullOrWhiteSpace(directory))
            {
                Directory.CreateDirectory(directory);
            }
        }

        /// <summary>
        /// Gets the fully qualified path given a filename and a relative path.
        /// </summary>
        /// <param name="filename">A fully qualified path to a file.</param>
        /// <param name="relativePath">A relative path to a file.</param>
        /// <returns></returns>
        public static string GetFullyQualifiedPath(string filename, string relativePath)
        {
            var baseDirectory = new FileInfo(filename).DirectoryName;

            if (string.IsNullOrEmpty(baseDirectory) || string.IsNullOrEmpty(relativePath))
                return null;

            return Path.Combine(baseDirectory, relativePath);
        }


        public static string GetRelativePath(string baseDirectory, string filename)
        {
            if (!baseDirectory.EndsWith("\\"))
                baseDirectory += "\\";

            Uri file = new Uri(filename);

            // Must end in a slash to indicate folder
            Uri folder = new Uri(baseDirectory);

            return Uri.UnescapeDataString(folder.MakeRelativeUri(file)
                    .ToString()
                    .Replace('/', Path.DirectorySeparatorChar)
                );
        }

        /// <summary>
        /// Opens a file location. Very snazzy.
        /// </summary>
        /// <param name="path"></param>
        public static void OpenFileLocation(string path)
        {
            // http://stackoverflow.com/a/9646139/232566

            if (File.Exists(path))
            {
                Process.Start("explorer.exe", $"/select, {path}");
            }
                
        }

        /// <summary>
        /// If the file exists, returns the contents. Otherwise, returns null.
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static string TryReadAllText(string path)
        {
            if (File.Exists(path))
                return File.ReadAllText(path);

            return null;
        }
    }
}