HttpRuntime Cache用法及参数解释

HttpRuntime.Cache.Add(
       KeyName,//缓存名
       KeyValue,//要缓存的对象
       Dependencies,//依赖项
       AbsoluteExpiration,//绝对过期时间
       SlidingExpiration,//相对过期时间
       Priority,//优先级
       CacheItemRemovedCallback);//缓存过期引发事件

HttpRuntime.Cache.Add("CurrencyFundCodeCache", docs, null, DateTime.Now.AddMinutes(2),  Cache.NoSlidingExpiration, CacheItemPriority.Normal, null);

/// <summary>
        /// 获得缓存
        /// </summary>
        /// <param name="cacheName"></param>
        /// <returns></returns>
        public static object GetRuntimeCache(string cacheName)
        {
            return HttpRuntime.Cache[cacheName];
        }
        /// <summary>
        /// 更新插入缓存
        /// </summary>
        /// <param name="cacheName"></param>
        /// <param name="value"></param>
        /// <param name="expiresAt"></param>
        public static void SetRuntimeCache(string cacheName, object value, DateTime expiresAt)
        {
             HttpRuntime.Cache.Add(cacheName, value, null, expiresAt,Cache.NoSlidingExpiration, CacheItemPriority.Normal, null);
        }

MongoCursor<BsonDocument> Data = HttpRuntime.Cache["KeyName"] as MongoCursor<BsonDocument>;

if (Data != null)

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; <br>    }<br><br><br>二.详细

HttpRuntime.Cache.Insert(key, value, null, DateTime.Now.AddSeconds(seconds),System.Web.Caching.Cache.NoSlidingExpiration);

HttpRuntime.Cache.Insert(key, value, null, System.Web.Caching.Cache.NoAbsoluteExpiration , TimeSpan.FromSeconds(seconds));

// 指定 Cache 对象中存储的项的相对优先级。
public enum CacheItemPriority
{
    //  在服务器释放系统内存时，具有该优先级级别的缓存项最有可能被从缓存删除。
    Low = 1,
    //  在服务器释放系统内存时，具有该优先级级别的缓存项比分配了 CacheItemPriority.Normal
    //  优先级的项更有可能被从缓存删除。
    BelowNormal = 2,
    //  在服务器释放系统内存时，具有该优先级级别的缓存项很有可能被从缓存删除，
    //  其被删除的可能性仅次于具有 CacheItemPriority.Low
    //  或 CacheItemPriority.BelowNormal 优先级的那些项。这是默认选项。
    Normal = 3,
    //  缓存项优先级的默认值为 CacheItemPriority.Normal。
    Default = 3,
    //  在服务器释放系统内存时，具有该优先级级别的缓存项被删除的可能性
    //  比分配了 CacheItemPriority.Normal 优先级的项要小。
    AboveNormal = 4,
    //  在服务器释放系统内存时，具有该优先级级别的缓存项最不可能被从缓存删除。
    High = 5,
    //  在服务器释放系统内存时，具有该优先级级别的缓存项将不会被自动从缓存删除。
    //  但是，具有该优先级级别的项会根据项的绝对到期时间或可调整到期时间与其他项一起被移除。
    NotRemovable = 6,
}

using System;
using System.Web;
using System.Collections;
public class CookiesHelper {    
/** <summary>    
/// 获取数据缓存    
/// </summary>    
/// <param name="CacheKey">键</param>    
public static object GetCache(string CacheKey)    
{        
System.Web.Caching.Cache objCache = HttpRuntime.Cache;
        return objCache[CacheKey];   
  }
    /** <summary>    
/// 设置数据缓存    
/// </summary>    
public static void SetCache(string CacheKey, object objObject)    
{        
System.Web.Caching.Cache objCache = HttpRuntime.Cache;    
     objCache.Insert(CacheKey, objObject);  
   }
    /** <summary>    
/// 设置数据缓存    
/// </summary>    
public static void SetCache(string CacheKey, object objObject, TimeSpan Timeout)   
  {        
System.Web.Caching.Cache objCache = HttpRuntime.Cache;   
      objCache.Insert(CacheKey, objObject, null, DateTime.MaxValue, Timeout, System.Web.Caching.CacheItemPriority.NotRemovable, null);     }
    /** <summary>    
/// 设置数据缓存    
/// </summary>    
public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)    
{        
System.Web.Caching.Cache objCache = HttpRuntime.Cache;    
     objCache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);    
}
    /** <summary>    
/// 移除指定数据缓存    
/// </summary>   
  public static void RemoveAllCache(string CacheKey)    
{        
System.Web.Caching.Cache _cache = HttpRuntime.Cache;     
    _cache.Remove(CacheKey);    
}
    /** <summary>   
  /// 移除全部缓存    
/// </summary>    
public static void RemoveAllCache()    
{       
  System.Web.Caching.Cache _cache = HttpRuntime.Cache;   
      IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();     
    while (CacheEnum.MoveNext())        
{          
   _cache.Remove(CacheEnum.Key.ToString());      
   }   
  }
}