使用：

 var s1 = @"C:UsersStevemedia.jpg"; var s2 = @"C:Program FilesMyAppimagesimage.png"; var uri = new Uri(s2); var result = uri.MakeRelativeUri(new Uri(s1)).ToString(); 

没有内置的.NET，但有本机function。 像这样用它：

 [DllImport("shlwapi.dll", CharSet=CharSet.Auto)] static extern bool PathRelativePathTo( [Out] StringBuilder pszPath, [In] string pszFrom, [In] FileAttributes dwAttrFrom, [In] string pszTo, [In] FileAttributes dwAttrTo ); 

或者如果你仍然喜欢托管代码，那么试试这个：

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  public static string GetRelativePath(FileSystemInfo path1, FileSystemInfo path2) { if (path1 == null) throw new ArgumentNullException("path1"); if (path2 == null) throw new ArgumentNullException("path2"); Func getFullName = delegate(FileSystemInfo path) { string fullName = path.FullName; if (path is DirectoryInfo) { if (fullName[fullName.Length - 1] != System.IO.Path.DirectorySeparatorChar) { fullName += System.IO.Path.DirectorySeparatorChar; } } return fullName; }; string path1FullName = getFullName(path1); string path2FullName = getFullName(path2); Uri uri1 = new Uri(path1FullName); Uri uri2 = new Uri(path2FullName); Uri relativeUri = uri1.MakeRelativeUri(uri2); return relativeUri.OriginalString; }