application 里面存一个arraylist 每隔一个时间刷新这个值

application 里面存一个arraylist 每隔一个时间刷新这个值,可以更快的做搜索等

using System;
using System.Data;
using System.Configuration; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.Security;

using System.Data.SqlClient;
using System.Threading; 
using System.Collections;
using Microsoft.ApplicationBlocks.Data;
using System.ComponentModel;




    /**//// <summary>
    /// GetMsg 篕璶磞瓃
    /// </summary>
    public class Tip
    ...{
        private static readonly Tip  _ScheduledTask = null;       
        private Timer UpdateTimer = null;         //
        private int Interval =2000;       
        private int _IsRunning; 
        
         static Tip()        
         ...{           
             _ScheduledTask = new Tip();
         } 
           public static Tip Instance()       
           ...{             
               return _ScheduledTask;        
           }

        public void Start()      
        ...{            
            if (UpdateTimer == null)           
            ...{         
                UpdateTimer = new Timer(new TimerCallback(UpdateTimerCallback), null, Interval, Interval);            
            }        
        } 

        public class Item
        ...{
            public Item(string text, string value)
            ...{
                this._text = text;
                this._value = value;
            }

            private string _text;
            public string Text
            ...{
                get
                ...{
                    return _text;
                }
            }

            private string _value;
            public string Value
            ...{
                get
                ...{
                    return _value;
                }
            }
        }

        private void UpdateTimerCallback(object sender)      
        ...{  
            if (Interlocked.Exchange(ref _IsRunning, 1) == 0)          
            ...{              
                try                
                ...{                     
                                   
                    DFS.Web.Global.GlobalArr =  FindWork();               
                }             
                catch         
                ...{      
                    
                }                
                finally         
                ...{                  
                    Interlocked.Exchange(ref _IsRunning, 0);  
                    
                }          
            }   
        }


        public void Stop()    
        ...{          
            if (UpdateTimer != null)     
            ...{               
                UpdateTimer.Dispose();     
                UpdateTimer = null;      
            }        
        }
        
        private ArrayList FindWork()   
        ...{  
            ArrayList arr =new ArrayList();
            string SQL = "select F1001,F1009 from F1 order by F1001 asc";
            SqlDataReader reader;
            reader =    SqlHelper.ExecuteReader(MyConfig.MyConfigSectionHandler.ConnectionString,CommandType.Text,SQL);
            while(reader.Read())
            ...{
                arr.Add(new Item(reader["F1001"].ToString(),reader["F1009"].ToString()));
            }
            reader.Close();

            return arr;
        } 
        


    }

 global.cs

 

protected void Application_Start(Object sender, EventArgs e)
  {
   System.Configuration.ConfigurationSettings.GetConfig("myConfig");
   
   Tip.Instance().Start();

protected void Application_End(Object sender, EventArgs e)
  {
   Tip.Instance().Stop();
  }