System.IO.Path.Path.GetPathRoot C# (CSharp) Méthode

		public static string GetPathRoot (string path)
		{
			if (path == null)
				return null;

			if (path.Trim ().Length == 0)
				throw new ArgumentException ("The specified path is not of a legal form.");

			if (!IsPathRooted (path))
				return String.Empty;
			
			if (DirectorySeparatorChar == '/') {
				// UNIX
				return IsDsc (path [0]) ? DirectorySeparatorStr : String.Empty;
			} else {
				// Windows
				int len = 2;

				if (path.Length == 1 && IsDsc (path [0]))
					return DirectorySeparatorStr;
				else if (path.Length < 2)
					return String.Empty;

				if (IsDsc (path [0]) && IsDsc (path[1])) {
					// UNC: \\server or \\server\share
					// Get server
					while (len < path.Length && !IsDsc (path [len])) len++;

					// Get share
					if (len < path.Length) {
						len++;
						while (len < path.Length && !IsDsc (path [len])) len++;
					}

					return DirectorySeparatorStr +
						DirectorySeparatorStr +
						path.Substring (2, len - 2).Replace (AltDirectorySeparatorChar, DirectorySeparatorChar);
				} else if (IsDsc (path [0])) {
					// path starts with '\' or '/'
					return DirectorySeparatorStr;
				} else if (path[1] == VolumeSeparatorChar) {
					// C:\folder
					if (path.Length >= 3 && (IsDsc (path [2]))) len++;
				} else
					return Directory.GetCurrentDirectory ().Substring (0, 2);// + path.Substring (0, len);
				return path.Substring (0, len);
			}
		}