using System;
using System.Web;
using System.Web.Caching;
using System.Collections;
-
/// <summary>
/// 设置Cache操作类
/// </summary>
public class SetCache
{
#region 用户自定义变量
private static readonly Cache _cache;//缓存实例
private static readonly int hourfactor;
#endregion
#region 构造函数
static SetCache()
{
hourfactor = 3600;
_cache = HttpRuntime.Cache;
}
-
private SetCache()
{
}
#endregion
#region 清除所有缓存
/// <summary>
/// 清除所有缓存
/// </summary>
public static void Clear()
{
//要循环访问 Cache 对象的枚举数
IDictionaryEnumerator enumerator = _cache.GetEnumerator();//检索用于循环访问包含在缓存中的键设置及其值的字典枚举数
if (enumerator != null)
{
while (enumerator.MoveNext())
{
_cache.Remove(enumerator.Key.ToString());
}
}
}
#endregion
#region 得到缓存实例
/// <summary>
/// 得到缓存实例
/// </summary>
/// <param name="key">缓存实例名称</param>
/// <returns>返回缓存实例</returns>
public static object GetCache(string key)
{
return _cache[key];
}
#endregion
#region 缓存实例插入
/// <summary>
/// 缓存实例插入(默认缓存20分钟)
/// </summary>
/// <param name="key">缓存实例名称</param>
/// <param name="obj">要缓存的对象</param>
public static void Insert(string key, object obj)
{
CacheDependency dep = null;
Insert(key, obj, dep, 20);
}
-
/// <summary>
/// 缓存实例插入
/// </summary>
/// <param name="key">缓存实例名称</param>
/// <param name="obj">要缓存的对象</param>
/// <param name="seconds">缓存的时间</param>
public static void Insert(string key, object obj, int seconds)
{
CacheDependency dep = null;
Insert(key, obj, dep, seconds);
}
-
/// <summary>
/// 缓存实例插入(缓存过期时间是一天)
/// </summary>
/// <param name="key">缓存实例名称</param>
/// <param name="obj">要缓存的对象</param>
/// <param name="dep">缓存的依赖项</param>
public static void Insert(string key, object obj, CacheDependency dep)
{
Insert(key, obj, dep, hourfactor * 12);
}
-
/// <summary>
/// 缓存实例插入(缓存过期时间是一天)
/// </summary>
/// <param name="key">缓存实例名称</param>
/// <param name="obj">要缓存的对象</param>
/// <param name="xmlPath">缓存的依赖项xml文件的路径（绝对路径）</param>
public static void Insert(string key, object obj, string xmlPath)
{
CacheDependency dep = new CacheDependency(xmlPath);
Insert(key, obj, dep, hourfactor * 12);
}
-
/// <summary>
/// 缓存实例插入
/// </summary>
/// <param name="key">缓存实例名称</param>
/// <param name="obj">要缓存的对象<</param>
/// <param name="seconds">缓存时间</param>
/// <param name="priority">该对象相对于缓存中存储的其他项的成本</param>
public static void Insert(string key, object obj, int seconds, CacheItemPriority priority)
{
Insert(key, obj, null, seconds, priority);
}
-
/// <summary>
/// 缓存实例插入
/// </summary>
/// <param name="key">用于引用该对象的缓存键</param>
/// <param name="obj">要插入缓存中的对象</param>
/// <param name="dep">该项的文件依赖项或缓存键依赖项。当任何依赖项更改时，该对象即无效，并从缓存中移除。如果没有依赖项，则此参数包含空引用（Visual Basic 中为 Nothing）</param>
/// <param name="seconds">所插入对象将过期并被从缓存中移除的时间。</param>
public static void Insert(string key, object obj, CacheDependency dep, int seconds)
{
Insert(key, obj, dep, seconds, CacheItemPriority.Normal);
}
-
/// <summary>
/// 缓存实例插入
/// </summary>
/// <param name="key">用于引用该对象的缓存键</param>
/// <param name="obj">要插入缓存中的对象</param>
/// <param name="xmlPath">缓存的依赖项xml文件的路径（绝对路径）</param>
/// <param name="seconds">所插入对象将过期并被从缓存中移除的时间。</param>
public static void Insert(string key, object obj, string xmlPath, int seconds)
{
CacheDependency dep = new CacheDependency(xmlPath);
Insert(key, obj, dep, seconds, CacheItemPriority.Normal);
}
-
/// <summary>
/// 缓存实例插入
/// </summary>
/// <param name="key">用于引用该对象的缓存键</param>
/// <param name="obj">要插入缓存中的对象</param>
/// <param name="dep">该项的文件依赖项或缓存键依赖项。当任何依赖项更改时，该对象即无效，并从缓存中移除。如果没有依赖项，则此参数包含空引用（Visual Basic 中为 Nothing）。</param>
/// <param name="seconds">所插入对象将过期并被从缓存中移除的时间。</param>
/// <param name="priority">该对象相对于缓存中存储的其他项的成本，由 CacheItemPriority 枚举表示。该值由缓存在退出对象时使用；具有较低成本的对象在具有较高成本的对象之前被从缓存移除。 </param>
public static void Insert(string key, object obj, CacheDependency dep, int seconds, CacheItemPriority priority)
{
if (obj != null)
{
_cache.Insert(key, obj, dep, DateTime.Now.AddSeconds((double)seconds), TimeSpan.Zero, priority, null);
}
}
#endregion
#region 移出单个缓存
/// <summary>
/// 移出单个缓存
/// </summary>
/// <param name="key">缓存实例名称</param>
public static void Remove(string key)
{
_cache.Remove(key);
}
-
#endregion
#region 得到所有使用的Cache键值
/// <summary>
/// 得到所有使用的Cache键值
/// </summary>
/// <returns>返回所有的Cache键值</returns>
public static ArrayList GetAllCacheKey()
{
ArrayList arrList = new ArrayList();
IDictionaryEnumerator enumerator = _cache.GetEnumerator();
if (enumerator != null)
{
while (enumerator.MoveNext())
{
arrList.Add(enumerator.Key);
}
}
return arrList;
}
#endregion
}