private Random GetRandomSeed()

        {

            byte[] bytes = new byte[4];

            RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();

            rng.GetBytes(bytes);

            return new Random(BitConverter.ToInt32(bytes, 0));

        }

备注：RNGCryptoServiceProvider

This type implements the IDisposable interface. When you have finished using the type, you should dispose of it either directly or indirectly. To dispose of the type directly, call its Dispose method in a try/catch block. To dispose of it indirectly, use a language construct such as using (in C#) or Using (in Visual Basic). For more information, see the "Using an Object that Implements IDisposable" section in the IDisposable interface topic.

注意：上述代码没有dispose