Creates a relative path from one file or folder to another. : Path « File Stream « C# / C Sharp

Creates a relative path from one file or folder to another.


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

namespace Genuilder.Extensibility
  public class PathUtil
    /// <summary>
    /// Creates a relative path from one file
    /// or folder to another.
    /// </summary>
    /// <param name="fromDirectory">
    /// Contains the directory that defines the
    /// start of the relative path.
    /// </param>
    /// <param name="toPath">
    /// Contains the path that defines the
    /// endpoint of the relative path.
    /// </param>
    /// <returns>
    /// The relative path from the start
    /// directory to the end path.
    /// </returns>
    /// <exception cref="ArgumentNullException"></exception>
    public static string RelativePathTo(
      string fromDirectory, string toPath)
      if(fromDirectory == null)
        throw new ArgumentNullException("fromDirectory");

      if(toPath == null)
        throw new ArgumentNullException("toPath");

      bool isRooted = Path.IsPathRooted(fromDirectory)
        && Path.IsPathRooted(toPath);

        bool isDifferentRoot = string.Compare(
          Path.GetPathRoot(toPath), true) != 0;

          return toPath;

      StringCollection relativePath = new StringCollection();
      string[] fromDirectories = fromDirectory.Split(

      string[] toDirectories = toPath.Split(

      int length = Math.Min(

      int lastCommonRoot = -1;

      // find common root
      for(int x = 0; x < length; x++)
          toDirectories[x], true) != 0)

        lastCommonRoot = x;
      if(lastCommonRoot == -1)
        return toPath;

      // add relative folders in from path
      for(int x = lastCommonRoot + 1; x < fromDirectories.Length; x++)
        if(fromDirectories[x].Length > 0)

      // add to folders to path
      for(int x = lastCommonRoot + 1; x < toDirectories.Length; x++)

      // create relative path
      string[] relativeParts = new string[relativePath.Count];
      relativePath.CopyTo(relativeParts, 0);

      string newPath = string.Join(

      return newPath;



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