1 /// <summary>
2 /// HttpRuntime Cache读取设置缓存信息封装
3 /// 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()))
4 /// 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
5 /// </summary>
6 public class CacheExtend
7 {
8 /// <summary>
9 /// 设置缓存时间，配置(从配置文件中读取)
10 /// </summary>
11 private const double Seconds = 30*24*60*60;
12
13 /// <summary>
14 /// 缓存指定对象，设置缓存
15 /// </summary>
16 public static bool Set(string key, object value)
17 {
18 return 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>
25 public static bool Set(string key, object value, string path)
26 {
27 try
28 {
29 var cacheDependency = new CacheDependency(path);
30 return Set(key, value, cacheDependency);
31 }
32 catch
33 {
34 return false;
35 }
36 }
37
38 /// <summary>
39 /// 缓存指定对象，设置缓存
40 /// </summary>
41 public static bool Set(string key, object value, CacheDependency cacheDependency)
42 {
43 return 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>
50 public static bool Set(string key, object value, double seconds, bool isAbsulute)
51 {
52 return Set(key, value, null, (isAbsulute ? DateTime.Now.AddSeconds(seconds) : Cache.NoAbsoluteExpiration),
53 (isAbsulute ? Cache.NoSlidingExpiration : TimeSpan.FromSeconds(seconds)), CacheItemPriority.Default,
54 null);
55 }
56
57 /// <summary>
58 /// 获取缓存对象
59 /// </summary>
60 public static object Get(string key)
61 {
62 return GetPrivate(key);
63 }
64
65 /// <summary>
66 /// 判断缓存中是否含有缓存该键
67 /// </summary>
68 public static bool Exists(string key)
69 {
70 return (GetPrivate(key) != null);
71 }
72
73 /// <summary>
74 /// 移除缓存对象
75 /// </summary>
76 /// <param name="key"></param>
77 /// <returns></returns>
78 public static bool Remove(string key)
79 {
80 if (string.IsNullOrEmpty(key))
81 {
82 return false;
83 }
84 HttpRuntime.Cache.Remove(key);
85 return true;
86 }
87
88 /// <summary>
89 /// 移除所有缓存
90 /// </summary>
91 /// <returns></returns>
92 public static bool RemoveAll()
93 {
94 IDictionaryEnumerator iDictionaryEnumerator = HttpRuntime.Cache.GetEnumerator();
95 while (iDictionaryEnumerator.MoveNext())
96 {
97 HttpRuntime.Cache.Remove(Convert.ToString(iDictionaryEnumerator.Key));
98 }
99 return true;
100 }
101
102
103 /// <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>
110 public static T TryGet<T>(string key, Func<T> func)
111 {
112 if (Exists(key)) return (T) Get(key);
113 var result = func.Invoke();
114 Set(key, result);
115 return result;
116 }
117
118
119
120 //------------------------提供给上面方法进行调用-----------------------------------
121 /// <summary>
122 /// 设置缓存
123 /// </summary>
124 public static bool Set(string key, object value, CacheDependency cacheDependency, DateTime dateTime,
125 TimeSpan timeSpan, CacheItemPriority cacheItemPriority, CacheItemRemovedCallback cacheItemRemovedCallback)
126 {
127 if (string.IsNullOrEmpty(key) || value == null)
128 {
129 return false;
130 }
131 HttpRuntime.Cache.Insert(key, value, cacheDependency, dateTime, timeSpan, cacheItemPriority,
132 cacheItemRemovedCallback);
133 return true;
134 }
135
136 /// <summary>
137 /// 获取缓存
138 /// </summary>
139 private static object GetPrivate(string key)
140 {
141 return string.IsNullOrEmpty(key) ? null : HttpRuntime.Cache.Get(key);
142 }
143 }
