static void Main(string[] args)
{
string[] files = FileHelp.GetFilesByDirectory(@"D:\youdaoyun", "*.md");
Random random = new Random(DateTime.Now.Second);
int r = random.Next(files.Length - 1);
string md = File.ReadAllText(files[r]);
string html = MarkDownHelp.MarkdownToHtml(md);
File.WriteAllText(@"D:\1.html", html);
//Process.Start(@"d:\1.html");
System.Console.WriteLine(html);
System.Console.WriteLine("Hello World!");
}