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);
    }
  }
}

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());
    }
  }
}

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}}