文件路径：
Console.WriteLine("Path.AltDirectorySeparatorChar={0}",
Path.AltDirectorySeparatorChar);
Console.WriteLine("Path.DirectorySeparatorChar={0}",
Path.DirectorySeparatorChar);
Console.WriteLine("Path.PathSeparator={0}",
Path.PathSeparator);
Console.WriteLine("Path.VolumeSeparatorChar={0}",
Path.VolumeSeparatorChar);
Console.Write("Path.GetInvalidPathChars()=");
foreach (char c in Path.GetInvalidPathChars())
Console.Write(c);
Console.WriteLine();
// This code produces output similar to the following:
// Note that the InvalidPathCharacters contain characters
// outside of the printable character set.
//
// Path.AltDirectorySeparatorChar=/
// Path.DirectorySeparatorChar=\
// Path.PathSeparator=;
// Path.VolumeSeparatorChar=:
