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Asp.net Core CacheHelper 通用缓存帮助类

2016-11-24 21:40 701 查看
using System;
using Microsoft.Extensions.Caching.Memory;
using System.Runtime;

namespace UFX.Tools
{
public class CacheHelper
{
public static IMemoryCache _memoryCache= new MemoryCache(new MemoryCacheOptions());

/// <summary>
/// 缓存绝对过期时间
/// </summary>
///<param name="key">Cache键值</param>
///<param name="value">给Cache[key]赋的值</param>
///<param name="minute">minute分钟后绝对过期</param>
public static void CacheInsertAddMinutes(string key, object value, int minute)
{
if (value == null) return;
_memoryCache.Set(key, value, new MemoryCacheEntryOptions()
.SetAbsoluteExpiration(TimeSpan.FromMinutes(minute)));
}

/// <summary>
/// 缓存相对过期,最后一次访问后minute分钟后过期
/// </summary>
///<param name="key">Cache键值</param>
///<param name="value">给Cache[key]赋的值</param>
///<param name="minute">滑动过期分钟</param>
public static void CacheInsertFromMinutes(string key, object value, int minute)
{
if (value == null) return;
_memoryCache.Set(key, value, new MemoryCacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromMinutes(minute)));
}

/// <summary>
///以key键值,把value赋给Cache[key].如果不主动清空,会一直保存在内存中.
/// </summary>
///<param name="key">Cache键值</param>
///<param name="value">给Cache[key]赋的值</param>
public static void CacheInsert(string key, object value)
{
_memoryCache.Set(key, value);
}

/// <summary>
///清除Cache[key]的值
/// </summary>
///<param name="key"></param>
public static void CacheNull(string key)
{
_memoryCache.Remove(key);
}

/// <summary>
///根据key值,返回Cache[key]的值
/// </summary>
///<param name="key"></param>
public static object CacheValue(string key)
{
return _memoryCache.Get(key);
}

#region 缓存文档
//public IActionResult Index()
//{
//    string cacheKey = "key";
//    string result;
//    if (!_memoryCache.TryGetValue(cacheKey, out result))
//    {
//        result = $"LineZero{DateTime.Now}";
//        _memoryCache.Set(cacheKey, result);
//        //设置相对过期时间2分钟
//        _memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
//            .SetSlidingExpiration(TimeSpan.FromMinutes(2)));
//        //设置绝对过期时间2分钟
//        _memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
//            .SetAbsoluteExpiration(TimeSpan.FromMinutes(2)));
//        //移除缓存
//        _memoryCache.Remove(cacheKey);
//        //缓存优先级 (程序压力大时,会根据优先级自动回收)
//        _memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
//            .SetPriority(CacheItemPriority.NeverRemove));
//        //缓存回调 10秒过期会回调
//        _memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
//            .SetAbsoluteExpiration(TimeSpan.FromSeconds(10))
//            .RegisterPostEvictionCallback((key, value, reason, substate) =>
//            {
//                Console.WriteLine($"键{key}值{value}改变,因为{reason}");
//            }));
//        //缓存回调 根据Token过期
//        var cts = new CancellationTokenSource();
//        _memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
//            .AddExpirationToken(new CancellationChangeToken(cts.Token))
//            .RegisterPostEvictionCallback((key, value, reason, substate) =>
//            {
//                Console.WriteLine($"键{key}值{value}改变,因为{reason}");
//            }));
//        cts.Cancel();
//    }
//    ViewBag.Cache = result;
//    return View();
//}
#endregion
}
}


不要忘记先下载:Microsoft.Extensions.Caching.Memory;
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