.net MemoryCache-关于项目的通知已删除 [英] .net MemoryCache - notify on item removed

问题描述

我在.NET 4.0和c#中使用了.net内存缓存，我希望在删除某个项目时通知我的应用程序(因此我可以将其删除的内容写到日志文件中或通知UI，将该项目删除).

I'm using a .net Memory Cache with .NET 4.0 and c#, I want my application to be notified when an item is removed (so I can write that it has been removed to a log file or notify the UI, that the item is removed).

反正有这样做吗?

我正在使用System.Runtime.Caching.MemoryCache而不是System.Web.Caching

I'm using System.Runtime.Caching.MemoryCache not System.Web.Caching

推荐答案

编辑:如果您使用的是System.Runtime.Caching.MemoryCache，则有

EDIT: If you're using the System.Runtime.Caching.MemoryCache there is a callback on the CacheItemPolicy object for deletion, as well as one for update.

myMemoryCache.Set("key", null, new CacheItemPolicy() {RemovedCallback = new CacheEntryRemovedCallback(CacheRemovedCallback) /* your other parameters here */});

public void CacheRemovedCallback(CacheEntryRemovedArguments arguments)
{
    // do what's needed
}

初始答案

在.net缓存中插入数据 System.Web.Caching名称空间，您可以选择设置一个回调，以通知其删除操作

When inserting data in the .net cache for the System.Web.Caching namespace you have the option to set a callback to be notified of removal

Cache.Insert("data", "", null, DateTime.Now.AddMinutes(1), System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.High, new CacheItemRemovedCallback(CacheRemovedCallback));

public string CacheRemovedCallback(String key, object value, System.Web.Caching.CacheItemRemovedReason removedReason)
{
    // here you can log, renew the value, etc...
}

还有Insert方法的签名，该签名使您可以将回调指定为

There is also a signature for the Insert method that lets you specify a callback to be notified before the item is removed

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