如何生成在C＃中8字节的GUID值？ [英] How to generate 8 byte GUID value in c#?

问题描述

可能重复：
  如何从GUID产生8个字节的唯一ID？

我需要一个独特的密钥识别用户的普遍和关键的长度刚好8个字节，我怎样才能做到这在C＃？

I need a unique key to identify a user at universal and key's length is just 8 byte, How can I do this in c# ?

推荐答案

以下code会生成加密唯一8字符串：

the following code will generate cryptographically unique 8 character strings:

 using System; 
using System.Security.Cryptography;
using System.Text;

namespace JustForFun
{


    public class UniqueId
    {   
        public static string GetUniqueKey()
        {
            int maxSize = 8;
            char[] chars = new char[62];
            string a;
            a = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
            chars = a.ToCharArray();
            int size = maxSize;
            byte[] data = new byte[1];
            RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider();
            crypto.GetNonZeroBytes(data);
            size = maxSize;
            data = new byte[size];
            crypto.GetNonZeroBytes(data);
            StringBuilder result = new StringBuilder(size);
            foreach (byte b in data)
            { result.Append(chars[b % (chars.Length - 1)]); }
            return result.ToString();
        }   
    }
}

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