C#中GUID的生成以及格式
1、GUID是在System命名空間下的結構（struct）體，下面展示實例。
（1）創建一個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）使用實例
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("默認格式：{0}", GuIdHelper.GetNewGuId()); else str.AppendFormat("<br />{0}格式：{1}", item, GuIdHelper.GetNewGuId(item)); } Response.Write(str.ToString()); } }}（3）顯示結果
默認格式：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}
在C#中GUID生成的四種格式
var uuid = Guid.NewGuid().ToString(); // 9af7f46a-ea52-4aa3-b8c3-9fd484c2af12 var uuidN = Guid.NewGuid().ToString("N"); // e0a953c3ee6040eaa9fae2b667060e09 var uuidD = Guid.NewGuid().ToString("D"); // 9af7f46a-ea52-4aa3-b8c3-9fd484c2af12 var uuidB = Guid.NewGuid().ToString("B"); // {734fd453-a4f8-4c5d-9c98-3fe2d7079760} var uuidP = Guid.NewGuid().ToString("P"); // (ade24d16-db0f-40af-8794-1e08e2040df3) var uuidX = Guid.NewGuid().ToString("X"); // {0x3fa412e3,0x8356,0x428f,{0xaa,0x34,0xb7,0x40,0xda,0xaf,0x45,0x6f}} 參考：https://msdn.microsoft.com/en-us/library/97af8hh4.aspx
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