/// <summary>
/// 移除缓存
/// </summary>
/// <param name="key"></param>
public bool RemoveCache(string key)
{
CacheEntity cacheEntity = null;
bool res = _DicCacheValue.TryRemove(key, out cacheEntity);
if (cacheEntity != null)
{
_CurrentLength -= cacheEntity.CacheLength;
}
return(res);
}
/// <summary>
/// 创建缓存对象
/// </summary>
/// <param name="cacheValue"></param>
/// <param name="cacheLength"></param>
/// <param name="absoluteExpiration"></param>
/// <param name="slidingExpiration"></param>
/// <returns></returns>
private CacheEntity CreateCacheEntity(string cacheValue, int cacheLength, int?absoluteExpiration = null, int?slidingExpiration = null)
{
CacheEntity cacheEntity = new CacheEntity {
CacheValue = cacheValue, CacheLength = cacheLength, CacheReferencesCount = 0, CacheVersion = 1
};
if (absoluteExpiration.HasValue)
{
cacheEntity.AbsoluteExpiration = DateTime.Now.AddSeconds(absoluteExpiration.Value);
}
if (slidingExpiration.HasValue)
{
cacheEntity.SlidingExpiration = slidingExpiration.Value;
}
if (!absoluteExpiration.HasValue && slidingExpiration.HasValue)
{
cacheEntity.AbsoluteExpiration = DateTime.Now.AddSeconds(slidingExpiration.Value);
}
_CurrentLength += cacheLength;
return(cacheEntity);
}
/// <summary>
/// 获取缓存
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public object GetCache(string key)
{
CacheEntity cacheEntity = null;
if (GetCacheEntity(key, out cacheEntity))
{
if (cacheEntity != null)
{
if (cacheEntity.IsExpiration)
{
RemoveCache(key);
return(null);
}
else if (cacheEntity.SlidingExpiration.HasValue)
{
cacheEntity.AbsoluteExpiration = DateTime.Now.AddSeconds(cacheEntity.SlidingExpiration.Value);
}
cacheEntity.CacheReferencesCount++;
cacheEntity.LastVisitDateTime = DateTime.Now;
return(cacheEntity.CacheValue);
}
}
return(null);
}
/// <summary>
/// 获取缓存对象
/// </summary>
/// <param name="key"></param>
/// <param name="cacheEntity"></param>
/// <returns></returns>
private bool GetCacheEntity(string key, out CacheEntity cacheEntity)
{
return(_DicCacheValue.TryGetValue(key, out cacheEntity));
}
