1、GUID是在System名稱空間下的結構（struct）體，下面展示例項。
（1）建立一個GUID幫助類（GUIDHelper）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebDemo.guid
{
    public class GuIdHelper
    {
        /// <summary>
        /// GUID生成
        /// </summary>
        /// <param name="format">
 
格式 可填寫N、D、B、P、X</param>
        /// <returns></returns>
        public static string GetNewGuId(string format="")
        {
            if (string.IsNullOrWhiteSpace(format))
                return Guid.NewGuid().ToString();
            else
                return Guid.NewGuid().ToString(format);
        }
    }
}
 

（2）使用例項

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;

namespace WebDemo.guid
{
    public partial class Index : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            StringBuilder str = new
 
 StringBuilder();
            string[] array = {"","N","D","B","P","X" };
            foreach (var item in array)
            {
                if (string.IsNullOrWhiteSpace(item))
                    str.AppendFormat("預設格式：{0}", GuIdHelper.GetNewGuId());
                else
                    str.AppendFormat("<br />{0}格式：{1}", item, GuIdHelper.GetNewGuId(item));
            }
            Response.Write(str.ToString());
        }
    }
}

（3）顯示結果

預設格式：4575c4b3-7997-4f11-acd9-f107258e9adc
N格式：a53a7186b583483aa4580519034e8095
D格式：5ae7f002-a989-4345-864b-3bcfbe09e1da
B格式：{d9762660-8461-4c44-b714-8ffad6e1b79c}
P格式：(694ce704-0a7d-41d5-a25a-4eaedf7db50d)
X格式：{0x75198f26,0xac4e,0x42c8,{0x96,0x88,0xcc,0x91,0xe0,0xa6,0x9b,0x21}