基础缓存操作类

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            ///
            <summary>
              2
            ///
             HttpRuntime Cache读取设置缓存信息封装

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            ///
             使用描述：给缓存赋值使用HttpRuntimeCache.Set(key,value....)等参数(第三个参数可以传递文件的路径(HttpContext.Current.Server.MapPath()))

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            ///
             读取缓存中的值使用JObject jObject=HttpRuntimeCache.Get(key) as JObject，读取到值之后就可以进行一系列判断

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            ///
            </summary>
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            public
            class
             CacheExtend

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            {

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            ///
            <summary>
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            ///
             设置缓存时间，配置(从配置文件中读取)

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            ///
            </summary>
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            private
            const
            double Seconds = 30*24*60*60;
 12 13///<summary> 14/// 缓存指定对象，设置缓存
 15///</summary> 16publicstaticbool Set(string key, object value)
 17{
 18return Set(key, value, null, DateTime.Now.AddSeconds(Seconds), Cache.NoSlidingExpiration,
 19 CacheItemPriority.Default, null);
 20}
 21 22///<summary> 23/// 缓存指定对象，设置缓存
 24///</summary> 25publicstaticbool Set(string key, object value, string path)
 26{
 27try 28{
 29var cacheDependency = new CacheDependency(path);
 30return Set(key, value, cacheDependency);
 31}
 32catch 33{
 34returnfalse;
 35}
 36}
 37 38///<summary> 39/// 缓存指定对象，设置缓存
 40///</summary> 41publicstaticbool Set(string key, object value, CacheDependency cacheDependency)
 42{
 43return Set(key, value, cacheDependency, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,
 44 CacheItemPriority.Default, null);
 45}
 46 47///<summary> 48/// 缓存指定对象，设置缓存
 49///</summary> 50publicstaticbool Set(string key, object value, double seconds, bool isAbsulute)
 51{
 52return Set(key, value, null, (isAbsulute ? DateTime.Now.AddSeconds(seconds) : Cache.NoAbsoluteExpiration),
 53 (isAbsulute ? Cache.NoSlidingExpiration : TimeSpan.FromSeconds(seconds)), CacheItemPriority.Default,
 54null);
 55}
 56 57///<summary> 58/// 获取缓存对象
 59///</summary> 60publicstaticobject Get(string key)
 61{
 62return GetPrivate(key);
 63}
 64 65///<summary> 66/// 判断缓存中是否含有缓存该键
 67///</summary> 68publicstaticbool Exists(string key)
 69{
 70return (GetPrivate(key) != null);
 71}
 72 73///<summary> 74/// 移除缓存对象
 75///</summary> 76///<param name="key"></param> 77///<returns></returns> 78publicstaticbool Remove(string key)
 79{
 80if (string.IsNullOrEmpty(key))
 81{
 82returnfalse;
 83}
 84HttpRuntime.Cache.Remove(key);
 85returntrue;
 86}
 87 88///<summary> 89/// 移除所有缓存
 90///</summary> 91///<returns></returns> 92publicstaticbool RemoveAll()
 93{
 94 IDictionaryEnumerator iDictionaryEnumerator = HttpRuntime.Cache.GetEnumerator();
 95while (iDictionaryEnumerator.MoveNext())
 96{
 97HttpRuntime.Cache.Remove(Convert.ToString(iDictionaryEnumerator.Key));
 98}
 99returntrue;
100}
101102103///<summary>104/// 尝试获取缓存，不存在则执行匿名委托
105///</summary>106///<typeparam name="T"></typeparam>107///<param name="key"></param>108///<param name="func"></param>109///<returns></returns>110publicstatic T TryGet<T>(string key, Func<T> func)
111{
112if (Exists(key)) return (T) Get(key);
113var result = func.Invoke();
114Set(key, result);
115return result;
116}
117118119120//------------------------提供给上面方法进行调用-----------------------------------121///<summary>122/// 设置缓存
123///</summary>124publicstaticbool Set(string key, object value, CacheDependency cacheDependency, DateTime dateTime,
125TimeSpan timeSpan, CacheItemPriority cacheItemPriority, CacheItemRemovedCallback cacheItemRemovedCallback)
126{
127if (string.IsNullOrEmpty(key) || value == null)
128{
129returnfalse;
130}
131HttpRuntime.Cache.Insert(key, value, cacheDependency, dateTime, timeSpan, cacheItemPriority,
132cacheItemRemovedCallback);
133returntrue;
134}
135136///<summary>137/// 获取缓存
138///</summary>139privatestaticobject GetPrivate(string key)
140{
141returnstring.IsNullOrEmpty(key) ? null : HttpRuntime.Cache.Get(key);
142}
143 }