C# 中GUID生成格式的四种方法

C#中GUID的生成以及格式

1、GUID是在System命名空间下的结构（struct）体，下面展示实例。
（1）创建一个GUID帮助类（GUIDHelper）

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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 可填写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）使用实例

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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( "默认格式：{0}" , GuIdHelper.GetNewGuId());

         else

           str.AppendFormat( "<br />{0}格式：{1}" , item, GuIdHelper.GetNewGuId(item));

       }

       Response.Write(str.ToString());

     }

   }

}

（3）显示结果

默认格式：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生成的四种格式

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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}}

参考：https://msdn.microsoft.com/en-us/library/97af8hh4.aspx

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