using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Security.Cryptography;
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using System.Collections.Concurrent;
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using System.Runtime.Caching;
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using System.Timers;
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namespace WebSRM.Utility
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{
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public class MemoryCacheHelper
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{
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/// <summary>
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/// 获取缓存
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="key"></param>
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/// <returns></returns>
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public static string GetCache(string key)
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{
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if (MemoryCache.Default == null || MemoryCache.Default[key] == null)
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{
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return null;
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}
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return MemoryCache.Default[key].ToString();
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}
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/// <summary>
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/// 创建缓存
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/// </summary>
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/// <param name="key"></param>
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/// <param name="val"></param>
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/// <param name="slidingExpiration">失效时间范围</param>
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/// <param name="absoluteExpiration">失效的绝对时间</param>
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/// <returns></returns>
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public static void SetCache(string key, string val, DateTime? absoluteExpiration = null, TimeSpan? slidingExpiration = null )
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{
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try
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{
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if (absoluteExpiration == null)
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{
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//默认设置为2小时之后
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absoluteExpiration = DateTime.Now.AddHours(2);
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}
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var policy = CreatePolicy(slidingExpiration, absoluteExpiration);
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MemoryCache.Default.Set(key, val, policy);
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}
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catch (Exception ex)
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{
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throw;
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}
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}
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/// <summary>
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/// 清空缓存
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/// </summary>
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public static void ClearCache()
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{
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List<string> cacheKeys = MemoryCache.Default.Select(kvp => kvp.Key).ToList();
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foreach (string cacheKey in cacheKeys)
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{
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MemoryCache.Default.Remove(cacheKey);
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}
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}
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private static CacheItemPolicy CreatePolicy(TimeSpan? slidingExpiration, DateTime? absoluteExpiration)
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{
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var policy = new CacheItemPolicy();
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if (absoluteExpiration.HasValue)
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{
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policy.AbsoluteExpiration = absoluteExpiration.Value;
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}
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else if (slidingExpiration.HasValue)
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{
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policy.SlidingExpiration = slidingExpiration.Value;
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}
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policy.Priority = CacheItemPriority.Default;
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return policy;
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}
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}
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}
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