C#缓存主要是为了提高数据的读取速度。由于server和应用client之间存在着流量的瓶颈,所以读取大容量数据时,使用缓存来直接为client服务,能够降低client与server端的数据交互。从而大大提高程序的性能。
下面为工作中经经常使用到的缓存操作公用类库整理:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Caching;
using System.Web.Hosting;
namespace ECS.Utility
{
/// <summary>
/// Caching 的摘要说明
/// </summary>
public class Caching
{
/// <summary>
/// 获取当前应用程序指定CacheKey的Cache值
/// </summary>
/// <param name="CacheKey"></param>
/// <returns></returns>y
public static object GetCache(string CacheKey)
{
System.Web.Caching.Cache objCache = HttpRuntime.Cache;
return objCache[CacheKey];
}
/// <summary>
/// 设置当前应用程序指定CacheKey的Cache值
/// </summary>
/// <param name="CacheKey"></param>
/// <param name="objObject"></param>
public static void SetCache(string CacheKey, object objObject)
{
System.Web.Caching.Cache objCache = HttpRuntime.Cache;
objCache.Insert(CacheKey, objObject);
}
/// <summary>
/// 设置当前应用程序指定CacheKey的Cache值
/// </summary>
/// <param name="CacheKey"></param>
/// <param name="objObject"></param>
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>
/// 清除单一键缓存
/// </summary>
/// <param name="key"></param>
public static void RemoveKeyCache(string CacheKey)
{
try
{
System.Web.Caching.Cache objCache = HttpRuntime.Cache;
objCache.Remove(CacheKey);
}
catch { }
}
/// <summary>
/// 清除全部缓存
/// </summary>
public static void RemoveAllCache()
{
System.Web.Caching.Cache _cache = HttpRuntime.Cache;
IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
if (_cache.Count > 0)
{
ArrayList al = new ArrayList();
while (CacheEnum.MoveNext())
{
al.Add(CacheEnum.Key);
}
foreach (string key in al)
{
_cache.Remove(key);
}
}
}
/// <summary>
/// 以列表形式返回已存在的全部缓存
/// </summary>
/// <returns></returns>
public static ArrayList ShowAllCache()
{
ArrayList al = new ArrayList();
System.Web.Caching.Cache _cache = HttpRuntime.Cache;
if (_cache.Count > 0)
{
IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
while (CacheEnum.MoveNext())
{
al.Add(CacheEnum.Key);
}
}
return al;
}
}
}