.net 随机数

system.Random类生成的随机数是伪随机，因此使用system.Security.Cryptography.RNGCryptoServiceProvider的类

 

 static int GetRandomSeed()
    {
        byte[] bytes = new byte[4];
        System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider();
        rng.GetBytes(bytes);
        return BitConverter.ToInt32(bytes, 0);
    }

    static int GetNumber()
    {
        return Math.Abs(GetRandomSeed());
    }