.net core 对 MemoryCache 的封装

最新推荐文章于 2025-11-06 07:10:02 发布

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本文介绍了一个内存缓存类MemoryCacheSheep的实现，包括缓存数据的读取、写入、更新、删除以及缓存的有效期设置等功能。该类提供了如Exists、GetCache、SetCache、SetSlidingCache和RemoveCache等方法。

public class MemoryCacheSheep
{
public static IMemoryCache _cache = new MemoryCache(new MemoryCacheOptions());

/// <summary>
/// 是否存在此缓存
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public bool Exists(string key)
{
if (string.IsNullOrWhiteSpace(key))
throw new ArgumentNullException(nameof(key));
object v = null;
return _cache.TryGetValue<object>(key, out v);
}
/// <summary>
/// 取得缓存数据
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public T GetCache<T>(string key) where T : class
{
if (string.IsNullOrWhiteSpace(key))
throw new ArgumentNullException(nameof(key));

T v = null;
_cache.TryGetValue<T>(key, out v);

return v;
}
/// <summary>
/// 设置缓存
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public void SetCache(string key, object value)
{
if (string.IsNullOrWhiteSpace(key))
throw new ArgumentNullException(nameof(key));
if (value == null)
throw new ArgumentNullException(nameof(value));

object v = null;
if (_cache.TryGetValue(key, out v))
_cache.Remove(key);
_cache.Set<object>(key, value);
}
/// <summary>
/// 设置缓存,绝对过期
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="expirationMinute">间隔分钟</param>
/// CommonManager.CacheObj.Save<RedisCacheHelper>("test", "RedisCache works!", 30);
public void SetCache(string key, object value, double expirationMinute)
{
if (string.IsNullOrWhiteSpace(key))
throw new ArgumentNullException(nameof(key));
if (value == null)
throw new ArgumentNullException(nameof(value));

object v = null;
if (_cache.TryGetValue(key, out v))
_cache.Remove(key);
DateTime now = DateTime.Now;
TimeSpan ts = now.AddMinutes(expirationMinute) - DateTime.Now;
_cache.Set<object>(key, value, ts);
}
/// <summary>
/// 设置缓存,绝对过期
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="expirationTime">DateTimeOffset 结束时间</param>
/// CommonManager.CacheObj.Save<RedisCacheHelper>("test", "RedisCache works!", DateTimeOffset.Now.AddSeconds(30));
public void SetCache(string key, object value, DateTimeOffset expirationTime)
{
if (string.IsNullOrWhiteSpace(key))
throw new ArgumentNullException(nameof(key));
if (value == null)
throw new ArgumentNullException(nameof(value));

object v = null;
if (_cache.TryGetValue(key, out v))
_cache.Remove(key);

_cache.Set<object>(key, value, expirationTime);
}
/// <summary>
/// 设置缓存,相对过期时间
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="t"></param>
/// CommonManager.CacheObj.SaveSlidingCache<MemoryCacheHelper>("test", "MemoryCache works!",TimeSpan.FromSeconds(30));
public void SetSlidingCache(string key, object value, TimeSpan t)
{
if (string.IsNullOrWhiteSpace(key))
throw new ArgumentNullException(nameof(key));
if (value == null)
throw new ArgumentNullException(nameof(value));

object v = null;
if (_cache.TryGetValue(key, out v))
_cache.Remove(key);

_cache.Set(key, value, new MemoryCacheEntryOptions()
{
SlidingExpiration = t
});
}
/// <summary>
/// 移除缓存
/// </summary>
/// <param name="key"></param>
public void RemoveCache(string key)
{
if (string.IsNullOrWhiteSpace(key))
throw new ArgumentNullException(nameof(key));

_cache.Remove(key);
}

/// <summary>
/// 释放
/// </summary>
public void Dispose()
{
if (_cache != null)
_cache.Dispose();
GC.SuppressFinalize(this);
}
}