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）

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

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

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