HttpRuntime.Cache的使用經驗

配置檔案

<appSettings>  

<add key="EnableCache" value="true"/>  

<add key="CacheDurationSeconds" value="300"/>

</appSettings>

操作方法

 

using System; 
using System.Web.Configuration;
public class SiteHelper 
{
     static public object GetCache(string CacheId)
     {
         object objCache = System.Web.HttpRuntime.Cache.Get(CacheId);
        // 判斷 Cache 是否啟用
        if (WebConfigurationManager.AppSettings["EnableCache"] ==null
             ||!Convert.ToBoolean(WebConfigurationManager.AppSettings["EnableCache"]))
         {
             objCache =null;
             System.Web.HttpRuntime.Cache.Remove(CacheId);
         }

        return objCache;
     }

    ///<summary>
     /// 寫入 Cache 資料 ( 預設 60 秒 )
     ///</summary>
     ///<param name="CacheId"></param>
     ///<param name="objCache"></param>
    static public void SetCache(string CacheId, object objCache)
     {
         if (WebConfigurationManager.AppSettings["CacheDurationSeconds"] !=null)
         {
             SetCache(CacheId, objCache, Convert.ToInt32(WebConfigurationManager.AppSettings["CacheDurationSeconds"]));
         }
         else
        {
             SetCache(CacheId, objCache, 60);
         }
     }

    static public void SetCache(string CacheId, object objCache, int cacheDurationSeconds)
     {
         if (objCache !=null)
         {
             System.Web.HttpRuntime.Cache.Insert(CacheId, objCache, null, System.Web.Caching.Cache.NoAbsoluteExpiration,new TimeSpan(0, 0, cacheDurationSeconds), System.Web.Caching.CacheItemPriority.High, null);
         }
     }
 }

使用方法

string strCache1 = SiteHelper.GetCache("Cache1") asstring;
if (strCache1 ==null) {     Response.Write("<p>Cache is empty</p>");
    strCache1 ="OK";     SiteHelper.SetCache("Cache1", strCache1, 30); }
Response.Write(strCache1);

常見問題#Cache顯示與清空問題

List<string> cacheKeys =new List<string>();

IDictionaryEnumerator cacheEnum = Cache.GetEnumerator();

while (cacheEnum.MoveNext())

{

    cacheKeys.Add(cacheEnum.Key.ToString());

}

foreach (string cacheKey in cacheKeys)

{

    Cache.Remove(cacheKey);

}

    //清除所有快取
    protected void RemoveAllCache()
     { 
        System.Web.Caching.Cache _cache = HttpRuntime.Cache;
         IDictionaryEnumerator CacheEnum = _cache.GetEnumerator(); 
        ArrayList al =new ArrayList(); 
        while (CacheEnum.MoveNext()) 
        { 
            al.Add(CacheEnum.Key); 
        } 
        foreach (string key in al) 
        { 
            _cache.Remove(key);
         }
         show();
     }     
//顯示所有快取
    void show()
     {
         string str ="";
         IDictionaryEnumerator CacheEnum = HttpRuntime.Cache.GetEnumerator();

        while (CacheEnum.MoveNext())
         { 
            str +="快取名<b>["+ CacheEnum.Key +"]</b><br />";
         } 
        this.Label1.Text ="當前網站總快取數:"+ HttpRuntime.Cache.Count +"<br />"+ str;
     }

新增到擴充套件方法

using System;
using System.Web.Caching;
using System.Collections;
using System.Collections.Generic;

///<summary>
/// 擴充 System.Web.Caching 名稱空間的 Extension Methods 
///</summary>
static public class CacheExtensionMethod
 {
     public static void Clear(this Cache x)
     {
         List<string> cacheKeys =new List<string>();
         IDictionaryEnumerator cacheEnum = x.GetEnumerator(); 
        while (cacheEnum.MoveNext())
         { 
            cacheKeys.Add(cacheEnum.Key.ToString()); 
        } 
        foreach (string cacheKey in cacheKeys)
         { 
            x.Remove(cacheKey); 
        }
     } 
}

 

轉自：http://blog.csdn.net/fengloveyun/article/details/5934158