C# .Net实现URL绝对路径和相对路径之间互相转换

网站制作开发中，URL的绝对路径和相对路径之间互相转换，是经常需要用到的。以下是在C#.Net下一种实现二者互相转化的方法：

[DllImport("shlwapi.dll", CharSet = CharSet.Auto)]

public static extern bool PathRelativePathTo(

[Out] StringBuilder pszPath,

string pszFrom,

FileAttributes dwAttrFrom,

string pszTo,

FileAttributes dwAttrTo

);

public static string ToRelativePath(string basePath, string absolutePath)

{

StringBuilder path = new StringBuilder(260);

PathRelativePathTo(path, basePath, FileAttributes.Normal,

absolutePath, FileAttributes.Normal);

string r = path.ToString();

if (r.StartsWith(".\\"))

{

return r.Substring(2);

}

return r;

}

public static string ToAbsolutePath(string basePath, string relativePath)

{

return new Uri(new Uri(basePath), relativePath).ToString();//如果是文件路径将/替换为\

}