基础缓存操作类

/// <summary>
/// HttpRuntime Cache读取设置缓存信息封装
/// 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()))
/// 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
/// </summary>
public class CacheExtend
{
/// <summary>
/// 设置缓存时间，配置(从配置文件中读取)
/// </summary>
private const double Seconds = 30*24*60*60;

/// <summary>
/// 缓存指定对象，设置缓存
/// </summary>
public static bool Set(string key, object value)
{
return Set(key, value, null, DateTime.Now.AddSeconds(Seconds), Cache.NoSlidingExpiration,
CacheItemPriority.Default, null);
}

/// <summary>
/// 缓存指定对象，设置缓存
/// </summary>
public static bool Set(string key, object value, string path)
{
try
{
var cacheDependency = new CacheDependency(path);
return Set(key, value, cacheDependency);
}
catch
{
return false;
}
}

/// <summary>
/// 缓存指定对象，设置缓存
/// </summary>
public static bool Set(string key, object value, CacheDependency cacheDependency)
{
return Set(key, value, cacheDependency, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,
CacheItemPriority.Default, null);
}

/// <summary>
/// 缓存指定对象，设置缓存
/// </summary>
public static bool Set(string key, object value, double seconds, bool isAbsulute)
{
return Set(key, value, null, (isAbsulute ? DateTime.Now.AddSeconds(seconds) : Cache.NoAbsoluteExpiration),
(isAbsulute ? Cache.NoSlidingExpiration : TimeSpan.FromSeconds(seconds)), CacheItemPriority.Default,
null);
}

/// <summary>
/// 获取缓存对象
/// </summary>
public static object Get(string key)
{
return GetPrivate(key);
}

/// <summary>
/// 判断缓存中是否含有缓存该键
/// </summary>
public static bool Exists(string key)
{
return (GetPrivate(key) != null);
}

/// <summary>
/// 移除缓存对象
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static bool Remove(string key)
{
if (string.IsNullOrEmpty(key))
{
return false;
}
HttpRuntime.Cache.Remove(key);
return true;
}

/// <summary>
/// 移除所有缓存
/// </summary>
/// <returns></returns>
public static bool RemoveAll()
{
IDictionaryEnumerator iDictionaryEnumerator = HttpRuntime.Cache.GetEnumerator();
while (iDictionaryEnumerator.MoveNext())
{
HttpRuntime.Cache.Remove(Convert.ToString(iDictionaryEnumerator.Key));
}
return true;
}


/// <summary>
/// 尝试获取缓存，不存在则执行匿名委托
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <param name="func"></param>
/// <returns></returns>
public static T TryGet<T>(string key, Func<T> func)
{
if (Exists(key)) return (T) Get(key);
var result = func.Invoke();
Set(key, result);
return result;
}

 

//------------------------提供给上面方法进行调用-----------------------------------
/// <summary>
/// 设置缓存
/// </summary>
public static bool Set(string key, object value, CacheDependency cacheDependency, DateTime dateTime,
TimeSpan timeSpan, CacheItemPriority cacheItemPriority, CacheItemRemovedCallback cacheItemRemovedCallback)
{
if (string.IsNullOrEmpty(key) || value == null)
{
return false;
}
HttpRuntime.Cache.Insert(key, value, cacheDependency, dateTime, timeSpan, cacheItemPriority,
cacheItemRemovedCallback);
return true;
}

/// <summary>
/// 获取缓存
/// </summary>
private static object GetPrivate(string key)
{
return string.IsNullOrEmpty(key) ? null : HttpRuntime.Cache.Get(key);
}
}