[C#]String 檔案路徑分割

 

傳入路徑，後面的參數(upLevel)為層級，透過層級來自動切割要哪一些資料

Ex: 

String  str = "C:\\123\\456\\789\\1.Txt";

str  = GetUpLevelDirectory(str,0);

// str = C:\\123\\456\\789

str = GetUpLevelDirectory(str,1);

//C:\\123\\456

str = GetUpLevelDirectory(str,2);

//C:\\123

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Path.GetFileName()、Path.GetExtension()、Path.GetFileNameWithoutExtension()

這三個方法是同一群的，依序是取得檔案名稱、取得副檔名、取得不包含副檔名的檔案名稱

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以下為 function

using System.Diagnostics;

private string GetUpLevelDirectory(string path, int upLevel)

{

    var directory = File.GetAttributes(path).HasFlag(FileAttributes.Directory)

        ? path

        : Path.GetDirectoryName(path);

    upLevel = upLevel < 0 ? 0 : upLevel;

    for (var i = 0; i < upLevel; i++)

    {

        directory = Path.GetDirectoryName(directory);

    }

    return directory;

}