C#缓存absoluteExpiration、slidingExpiration两个参数的疑惑

发布：2022/4/21 10:33:38作者：管理员来源：本站浏览次数：1246

看了很多资料终于搞明白cache中absoluteExpiration，slidingExpiration这两个参数的含义。

absoluteExpiration：用于设置绝对过期时间，它表示只要时间一到就过期，所以类型为System.DateTime，当给这个参数设置了一个时间时，slidingExpiration参数的值就只能为Cache.NoSlidingExpiration，否则出错；

slidingExpiration：用于设置可调过期时间，它表示当离最后访问超过某个时间段后就过期，所以类型为System.TimeSpan，当给这个参数设置了一个时间段时，absoluteExpiration的值就只能为Cache.NoAbsoluteExpiration，否则出错；

两个使用实例

Cache.Add("name", content, null, System.Web.Caching.Cache.NoAbsoluteExpiration, TimeSpan.FromMinutes(10), System.Web.Caching.CacheItemPriority.Normal, null);

Cache.Add("name", content, null, DateTime.Now.AddMinutes(10), System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.Normal, null);

// 摘要:

// Inserts an object into the System.Web.Caching.Cache object together with dependencies,

// expiration policies, and a delegate that you can use to notify the application

// before the item is removed from the cache.

// 参数:

// key:

// The cache key that is used to reference the object.

// value:

// The object to insert into the cache.

// dependencies:

// The file or cache key dependencies for the item. When any dependency changes,

// the object becomes invalid and is removed from the cache. If there are no dependencies,

// this parameter contains null.

// absoluteExpiration:

// The time at which the inserted object expires and is removed from the cache.

// To avoid possible issues with local time such as changes from standard time to

// daylight saving time, use System.DateTime.UtcNow instead of System.DateTime.Now

// for this parameter value. If you are using absolute expiration, the slidingExpiration

// parameter must be set to System.Web.Caching.Cache.NoSlidingExpiration.

// slidingExpiration:

// The interval between the time that the cached object was last accessed and the

// time at which that object expires. If this value is the equivalent of 20 minutes,

// the object will expire and be removed from the cache 20 minutes after it was

// last accessed. If you are using sliding expiration, the absoluteExpiration parameter

// must be set to System.Web.Caching.Cache.NoAbsoluteExpiration.

// onUpdateCallback:

// A delegate that will be called before the object is removed from the cache. You

// can use this to update the cached item and ensure that it is not removed from

// the cache.

// 异常:

// T:System.ArgumentNullException:

// The key, value, or onUpdateCallback parameter is null.

// T:System.ArgumentOutOfRangeException:

// You set the slidingExpiration parameter to less than TimeSpan.Zero or the equivalent

// of more than one year.

// T:System.ArgumentException:

// The absoluteExpiration and slidingExpiration parameters are both set for the

// item you are trying to add to the Cache.-or-The dependencies parameter is null,

// and the absoluteExpiration parameter is set to System.Web.Caching.Cache.NoAbsoluteExpiration,

// and the slidingExpiration parameter is set to System.Web.Caching.Cache.NoSlidingExpiration.

public void Insert(string key, object value, CacheDependency dependencies, DateTime absoluteExpiration, TimeSpan slidingExpiration, CacheItemUpdateCallback onUpdateCallback);

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C#缓存absoluteExpiration、slidingExpiration两个参数的疑惑

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C#缓存absoluteExpiration、slidingExpiration两个参数的疑惑

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