Gets the relative path from a source to a target path. : Path « File Stream « C# / C Sharp

Gets the relative path from a source to a target path.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace StyleCopContrib.Runner
  /// <summary>
  /// A path utility class.
  /// </summary>
  public static class PathUtility
    #region Methods

    /// <summary>
    /// Gets the relative path from a source to a target path.
    /// </summary>
    /// <param name="fromPath">The from source path.</param>
    /// <param name="toPath">The to target path.</param>
    /// <returns>The relative path.</returns>
    public static string GetRelativePath(string fromPath, string toPath)
      if (!Path.IsPathRooted(fromPath) || !Path.IsPathRooted(toPath))
        throw new InvalidOperationException("Only fully qualified path are supported");

      string relativePath;

      string[] fromPathParts = fromPath.Split(Path.DirectorySeparatorChar);
      string[] toPathParts = toPath.Split(Path.DirectorySeparatorChar);

      int partIndex = 0;
      while (partIndex < fromPathParts.Length)
        if (fromPathParts[partIndex].ToUpperInvariant() != toPathParts[partIndex].ToUpperInvariant()) break;


      if (partIndex == 0)
        relativePath = toPath;
        string backPath = string.Join(Path.DirectorySeparatorChar.ToString(),
                        Enumerable.Repeat("..", fromPathParts.Length - partIndex).ToArray());

        string forewardPath = string.Join(Path.DirectorySeparatorChar.ToString(), toPathParts, partIndex,
                          toPathParts.Length - partIndex);

        if (!string.IsNullOrEmpty(backPath))
          relativePath = string.Concat(backPath, Path.DirectorySeparatorChar, forewardPath);
          relativePath = forewardPath;

      return relativePath;



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