C#絕對路徑拼接相對路徑的執行個體代碼

做項目時發現Path.Combine方法只能支援傻瓜式的目錄拼接

複製代碼 代碼如下://絕對路徑
string absolutePath = @"C:\Program Files\Internet Explorer";
//相對路徑
string relativePath = @"..\TestPath\";
//預計拼接結果
string splicingResult = string.Empty;
Console.WriteLine(string.Format("Path.Combine(\"{0}\",\"{1}\")=\"{2}\"", absolutePath, relativePath, Path.Combine(absolutePath, relativePath)));

輸出結果為：

發現並沒有按照想像的分辨出相對路徑和絕對路徑，所以只好用正則匹配了相對路徑進行重新拼接，以下方法只支援絕對路徑+相對路徑的方式

//絕對路徑
string absolutePath = @"C:\Program Files\Internet Explorer";
//相對路徑
string relativePath = @"..\TestPath\";
//預計拼接結果
string splicingResult = string.Empty;
Console.WriteLine(string.Format("Path.Combine(\"{0}\",\"{1}\")=\"{2}\"", absolutePath, relativePath, Path.Combine(absolutePath, relativePath)));
if (!Path.IsPathRooted(relativePath))
{
//匹配相對路徑，匹配需要向上推的目錄層數
Regex regex = new Regex(@"^\\|([..]+)");
int backUp = regex.Matches(relativePath).Count;
List<string> pathes = absolutePath.Split("\\".ToCharArray()).ToList();
pathes.RemoveRange(pathes.Count - backUp, backUp);
//匹配檔案名稱，匹配需要附加的目錄層數
regex = new Regex(@"^\\|([a-zA-Z0-9]+)");
MatchCollection matches = regex.Matches(relativePath);
foreach (Match match in matches)
{
pathes.Add(match.Value);
}
//磁碟機地址取絕對路徑中的磁碟機地址
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();

輸出結果：