c#生成大量隨機碼

最近公司需要一個生成大量隨機碼用於數字銷售。代碼如下：

  class Program
    {
        static void Main(string[] args)
        {
            StreamWriter swriter = new StreamWriter("1.txt", true);

            for (int i = 0; i < 1000000; i++)
            {
                swriter.Write(generateRandomString(20));
                swriter.WriteLine();
            Console.WriteLine("Number: {0}",
                i);
            }
            swriter.Flush();
            swriter.Close();
        }

        static Random random = new Random();
        static string generateRandomString(int length)
        {
            var chars = "ABCDEFGHIJKLMNPQRSTUVWXYZ123456789";

            StringBuilder result = new StringBuilder();

            for (int i = 0; i < length; i++)
            {
                int index = random.Next(chars.Length);
                result.Append(chars[index]);
            }

            return result.ToString();
        }

    }

上面是簡單的一個console的程序。

可改寫成wpf程序。