c# - 如何从 ASP.NET Core 中的 IMemoryCache 中删除(重置)所有对象

Question

Remove 方法可以通过键从 IMemoryCache 中删除对象。有没有办法重置整个缓存并删除所有对象？

使用 How to clear MemoryCache? 所述的 Dispose 方法不起作用:

ObjectDisposedException: Cannot access a disposed object.
 Object name: 'Microsoft.Extensions.Caching.Memory.MemoryCache'.

Answer 1

参见 Cache in-memory in ASP.NET Core ，特别是关于 Cache dependencies .

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();
    }
}