creates a relative path to "targetFile" that is relative to "path" : Path « File Stream « C# / C Sharp






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

creates a relative path to "targetFile" that is relative to "path"

     

using System;
using System.IO;
using System.Text;

public class Util
{
    public static string CreateRelativePath(string targetFile, string path)
    {
        if ((File.GetAttributes(path) & FileAttributes.Directory) != FileAttributes.Directory)
        {
            path = Path.GetDirectoryName(path);
        }

        string[] absDirs = path.Split('\\');
        string[] relDirs = targetFile.Split('\\');

        int length = absDirs.Length < relDirs.Length ? absDirs.Length :
        relDirs.Length;

        int lastCommonRoot = -1;
        int index;

        for (index = 0; index < length; index++)
        {
            if (absDirs[index] == relDirs[index]) lastCommonRoot = index;
            else break;
        }

        if (lastCommonRoot == -1)
        {
            return Path.GetFullPath(targetFile);
        }

        StringBuilder relativePath = new StringBuilder();

        for (index = lastCommonRoot + 1; index < absDirs.Length; index++)
        {
            if (absDirs[index].Length > 0) relativePath.Append("..\\");
        }
        for (index = lastCommonRoot + 1; index < relDirs.Length - 1; index++)
        {
            relativePath.Append(relDirs[index] + "\\");
        }
        relativePath.Append(relDirs[relDirs.Length - 1]);

        return relativePath.ToString();
    }
}








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