System.Security.Cryptography.RNGCryptoServiceProvider
private static int Next(int numSeeds, int length) { // Create a byte array to hold the random value. byte[] buffer = new byte[length]; // Create a new instance of the RNGCryptoServiceProvider. System.Security.Cryptography.RNGCryptoServiceProvider Gen = new System.Security.Cryptography.RNGCryptoServiceProvider(); // Fill the array with a random value. Gen.GetBytes(buffer); // Convert the byte to an uint value to make the modulus operation easier. uint randomResult = 0x0;//这里用uint作为生成的随机数 for (int i = 0; i < length; i++) { randomResult |= ((uint)buffer[i] << ((length - 1 - i) * 8)); } // Return the random number mod the number // of sides. The possible values are zero-based return (int)(randomResult % numSeeds); }
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for (int i = 0; i < 20; i++) { byte[] randomBytes = new byte[8]; System.Security.Cryptography.RNGCryptoServiceProvider rngServiceProvider = new System.Security.Cryptography.RNGCryptoServiceProvider(); rngServiceProvider.GetBytes(randomBytes); int result = BitConverter.ToInt32(randomBytes, 0); result = System.Math.Abs(result); //求绝对值 Console.WriteLine(result); }