把一种类型的多个文件合并成一个文件的控制台程序

static void Main(string[] args)
        {
            string currentDirectory = Environment.CurrentDirectory;
            string[] files = Directory.GetFiles(currentDirectory, "*.sql");
            string path = Path.Combine(currentDirectory, "all.sql");
            using (FileStream stream = File.Create(path))
            {
                stream.Dispose();
            }
            foreach (string str3 in files)
            {
                string str4 = Path.Combine(currentDirectory, str3);
                if (path.ToLower() != str4.ToLower())
                {
                    string contents = File.ReadAllText(str4, Encoding.UTF8) + "\r\n";
                    File.AppendAllText(path, contents);
                }
            }
            }