HttpRuntime.Cache的使用经验

配置文件

<appSettings>  

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

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

</appSettings>

操作方法

代码

using System;

using System.Web.Configuration;
public class SiteHelper

{

    static public object GetCache(string CacheId)

    {

        object objCache = System.Web.HttpRuntime.Cache.Get(CacheId);
        // 判断 Cache 是否启用

        if (WebConfigurationManager.AppSettings["EnableCache"] ==null

            ||!Convert.ToBoolean(WebConfigurationManager.AppSettings["EnableCache"]))

        {

            objCache =null;

            System.Web.HttpRuntime.Cache.Remove(CacheId);

        }

        return objCache;

    }

    ///<summary>

    /// 写入 Cache 资料 ( 预设 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, );

        }

    }

    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(, , cacheDurationSeconds), System.Web.Caching.CacheItemPriority.High, null);

        }

    }

}

使用方法

代码

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

常见问题#Cache显示与清空问题

代码

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);
 }

代码

    //清除所有缓存
    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();
     }    
//显示所有缓存
    void show()
     {
         string str ="";
         IDictionaryEnumerator CacheEnum = HttpRuntime.Cache.GetEnumerator();

        while (CacheEnum.MoveNext())
         {
            str +="缓存名<b>["+ CacheEnum.Key +"]</b><br />";
         }
        this.Label1.Text ="当前网站总缓存数:"+ HttpRuntime.Cache.Count +"<br />"+ str;
     }

添加到扩展方法

代码

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

///<summary>
/// 扩充 System.Web.Caching 命名空间的 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);
        }
     }
}

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