C# 絕對路徑轉相對路徑

程式碼轉載自 Deep Brain Studio

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private string RelativePath(string absolutePath, string relativeTo) {     string[] absoluteDirectories = absolutePath.Split('\\');     string[] relativeDirectories = relativeTo.Split('\\');//Get the shortest of the two paths     int length = absoluteDirectories.Length < relativeDirectories.Length ? absoluteDirectories.Length : relativeDirectories.Length;//Use to determine where in the loop we exited     int lastCommonRoot = -1;     int index; //Find common root     for (index = 0; index < length; index++)         if (absoluteDirectories[index] == relativeDirectories[index])             lastCommonRoot = index;         else             break;//If we didn't find a common prefix then throw     if (lastCommonRoot == -1)         throw new ArgumentException("Paths do not have a common base");//Build up the relative path     StringBuilder relativePath = new StringBuilder(); //Add on the ..     for (index = lastCommonRoot + 1; index < absoluteDirectories.Length; index++)         if (absoluteDirectories[index].Length > 0)             relativePath.Append("..\\"); //Add on the folders     for (index = lastCommonRoot + 1; index < relativeDirectories.Length - 1; index++)         relativePath.Append(relativeDirectories[index] + "\\");     relativePath.Append(relativeDirectories[relativeDirectories.Length - 1]);     return relativePath.ToString(); }

不過遇到不同磁碟時就會 throw exception～最好是可以事先作別的處理避免這個問題。