C#函数:获取自定义GUID c#常用获取类型的方法有哪些?

代码如下：

       private readonly ThreadLocal<Random> random = new ThreadLocal<Random>(() => new Random());
       private void button1_Click(object sender, EventArgs e)
       {
           TryIt();
       }

       string GenerateGUID()
       {
           string currentDate = DateTime.Now.ToString("yyyyMMdd");
           string currentTime = DateTime.Now.ToString("HHmmss");
    
           string milliseconds = DateTime.Now.ToString("fff"); // 毫秒

           string GUID = currentDate + "-" + currentTime + "-" +
                         milliseconds + "-" + CreateRandomHex(3) + "-" +
                         CreateRandomHex(12);

           return GUID.ToUpper();
       }

       string CreateRandomHex(int length)
       {
           const string hexChars = "0123456789ABCDEF";
           StringBuilder hexString = new StringBuilder();
           using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
           {
               byte[] randomBytes = new byte[length];
               rng.GetBytes(randomBytes);

               for (int i = 0; i < length; i++)
               {
                   int index = randomBytes[i] % hexChars.Length;
                   hexString.Append(hexChars[index]);
               }
           }

           return hexString.ToString();
       }
       void TryIt()
       {
           for (int i = 0; i < 1000; i++)
           {
               string newGUID = GenerateGUID();
               Debug.WriteLine(newGUID);
           }
       }