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






  1. C# / C Sharp
  2. File Stream
  3. Path

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);

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

        if(isDifferentRoot)
          return toPath;
      }

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

      string[] toDirectories = toPath.Split(
        Path.DirectorySeparatorChar);

      int length = Math.Min(
        fromDirectories.Length,
        toDirectories.Length);

      int lastCommonRoot = -1;

      // find common root
      for(int x = 0; x < length; x++)
      {
        if(string.Compare(fromDirectories[x],
          toDirectories[x], true) != 0)
          break;

        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)
          relativePath.Add("..");

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

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

      string newPath = string.Join(
        Path.DirectorySeparatorChar.ToString(),
        relativeParts);

      return newPath;
    }

  }
}








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