MVC版
1：Startup类
public void ConfigureServices(IServiceCollection services)
{
。。。忽略
services.AddMemoryCache();//启用内存缓存
}
2：Controller调用
IMemoryCache _memoryCache;
public MyCacheController(IMemoryCache memoryCache)
{
_memoryCache = memoryCache;
}
public void MySize()
{
CancellationTokenSource tokenSource = new CancellationTokenSource();
var cacheOptions = new MemoryCacheEntryOptions()
{
//5s过期，被动过期，需要下一次被调用的时候，触发‘RegisterPostEvictionCallback’
AbsoluteExpiration = DateTimeOffset.Now.AddSeconds(5)
};
//过期触发的回调方法，大家可以调试查看key/value/reason/obj
cacheOptions.RegisterPostEvictionCallback((key, value, reason, obj) =>
{
Console.WriteLine(reason);
});
//添加主动过期回调
cacheOptions.AddExpirationToken(new CancellationChangeToken(tokenSource.Token));
_memoryCache.Set("key", "value", cacheOptions);
//2秒后主动过期,2秒后主动调用RegisterPostEvictionCallback方法
tokenSource.CancelAfter(1000 * 2);
}
控制台版本：
static void Main(string[] args)
{
//cache的最大限制是：100
MemoryCache memoryCache = new MemoryCache(new MemoryCacheOptions()
{
});
CancellationTokenSource tokenSource = new CancellationTokenSource();
var cacheOptions = new MemoryCacheEntryOptions()
{
AbsoluteExpiration = DateTimeOffset.Now.AddSeconds(10) //10s过期
};
cacheOptions.RegisterPostEvictionCallback((key, value, reason, obj) =>
{
Console.WriteLine(reason);
});
cacheOptions.AddExpirationToken(new CancellationChangeToken(tokenSource.Token));
memoryCache.Set("key", "value", cacheOptions);
//System.Threading.Thread.Sleep(2000);
tokenSource.CancelAfter(1000 * 2);
Console.Read();
}
