C#绝对路径拼接相对路径的实例代码

做项目时发现Path.Combine方法只能支持傻瓜式的目录拼接

复制代码 代码如下:
//绝对路径
string absolutePath = @"C:Program FilesInternet Explorer";
//相对路径
string relativePath = @"..TestPath";
//预计拼接结果
string splicingResult = string.Empty;
Console.WriteLine(string.Format("Path.Combine("{0}","{1}")="{2}"", absolutePath, relativePath, Path.Combine(absolutePath, relativePath)));

输出结果为：

发现并没有按照想像的分辨出相对路径和绝对路径，所以只好用正则匹配了相对路径进行重新拼接，以下方法只支持绝对路径+相对路径的方式

//绝对路径
string absolutePath = @"C:Program FilesInternet Explorer";
//相对路径
string relativePath = @"..TestPath";
//预计拼接结果
string splicingResult = string.Empty;
Console.WriteLine(string.Format("Path.Combine("{0}","{1}")="{2}"", absolutePath, relativePath, Path.Combine(absolutePath, relativePath)));
if (!Path.IsPathRooted(relativePath))
{
    //匹配相对路径，匹配需要向上推的目录层数
    Regex regex = new Regex(@"^\|([..]+)");
    int backUp = regex.Matches(relativePath).Count;
    List pathes = absolutePath.Split("\".ToCharArray()).ToList();
    pathes.RemoveRange(pathes.Count - backUp, backUp);
    //匹配文件名，匹配需要附加的目录层数
    regex = new Regex(@"^\|([a-zA-Z0-9]+)");
    MatchCollection matches = regex.Matches(relativePath);
    foreach (Match match in matches)
    {
        pathes.Add(match.Value);
    }
    //驱动器地址取绝对路径中的驱动器地址
    pathes[0] = Path.GetPathRoot(absolutePath);
    foreach (string p in pathes)
    {
        splicingResult = Path.Combine(splicingResult, p);
    }
}
Console.WriteLine(string.Format("Absolute Path={0}",absolutePath));
Console.WriteLine(string.Format("Relative Path={0}", relativePath));
Console.WriteLine(string.Format("Path.Combine("{0}","{1}")="{2}"", absolutePath, relativePath, splicingResult));
Console.ReadLine();

输出结果：