C#相对路径转绝对路径，绝对路径转相对路径

1.绝对路径转相对路径

 

绝对转相对似乎C#没有提供实现，需要自己写，这里摘选了一位博友的实现方法：

string RelativePath(string absolutePath, string relativeTo)        {            //from - www.cnphp6.com            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();        }

 

调用：

static void Main(string[] args){    var path = RelativePath(@"D:\MyProj\Release", @"D:\MyProj\Log\MyFile.txt");    Console.WriteLine(path);//print ..\Log\MyFile.txt    Console.Read();}

 

 

2.相对路径转绝对路径

 

可以直接用.Net自己的Path.GetFullPath转换。用SetCurrentDirectory改变当前比较路径

static void Main(string[] args){    var relativePath = @"..\..\Release";    //Directory.SetCurrentDirectory(...)    Console.WriteLine(Path.GetFullPath(relativePath));    Console.Read();}