问题描述

我可以找到一个 remove 方法，通过它的键从 IMemoryCache 中删除一个对象.有没有办法重置整个缓存并删除所有对象?

I can find a remove method to remove an object from IMemoryCache by its key. Is there a way to reset the whole cache and remove all objects?

如何清除 MemoryCache?链接中提供的 Dispose 方法在 asp.net 5 中给了我一个异常. ObjectDisposedException:无法访问已处理的对象.对象名称:Microsoft.Extensions.Caching.Memory.MemoryCache".

How to clear MemoryCache? Dispose method provided in the link gives me an exception in asp.net 5. ObjectDisposedException: Cannot access a disposed object. Object name: 'Microsoft.Extensions.Caching.Memory.MemoryCache'.

推荐答案

参见 在 ASP.NET Core 中缓存内存，特别是关于缓存依赖项.

使用 CancellationTokenSource 可以将多个缓存条目作为一个组逐出

Using a CancellationTokenSource allows multiple cache entries to be evicted as a group

这段代码对我有用:

public class CacheProvider 
{
    private static CancellationTokenSource _resetCacheToken = new CancellationTokenSource();
    private readonly IMemoryCache _innerCache;

    /* other methods and constructor removed for brevity */

    public T Set<T>(object key, T value) 
    {
        /* some other code removed for brevity */
        var options = new MemoryCacheEntryOptions().SetPriority(CacheItemPriority.Normal).SetAbsoluteExpiration(typeExpiration);
        options.AddExpirationToken(new CancellationChangeToken(_resetCacheToken.Token));

        _innerCache.Set(CreateKey(type, key), value, options);

        return value;
    }

    public void Reset()
    {
        if (_resetCacheToken != null && !_resetCacheToken.IsCancellationRequested && _resetCacheToken.Token.CanBeCanceled)
        {
            _resetCacheToken.Cancel();
            _resetCacheToken.Dispose();
        }

        _resetCacheToken = new CancellationTokenSource();
    }
}

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