C# 产生真随机数（RNGCryptoServiceProvider）

参考：http://www.cftea.com/c/2017/02/6808.asp

public static string GetRandomString(int length, bool useNum = false, bool useLow = false, bool useUpp = false, bool useSpe = false)
        {
            RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
            byte[] data = new byte[8];
            string result = null, str = "";
            if (useNum == true) { str += "0123456789"; }
            if (useLow == true) { str += "abcdefghijklmnopqrstuvwxyz"; }
            if (useUpp == true) { str += "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; }
            if (useSpe == true) { str += "!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"; }
            System.Random r = new System.Random(BitConverter.ToInt32(data, 0));
            for (int i = 0; i < length; i++)
            {
                rng.GetBytes(data);
                result += str.Substring(r.Next(0, str.Length - 1), 1);
            }
			/*
            for (int i = 0; i < length; i++)
            {
                rng.GetBytes(data);
                int rnd = (int)Math.Round(Math.Abs(BitConverter.ToInt64(data, 0)) / (decimal)long.MaxValue * length, 0);
                result += result.Substring(rnd, 1);
            }
			*/
			
            return result;
        }

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