【无私分享:ASP.NET CORE 项目实战(第十一章)】Asp.net Core 缓存 MemoryCache 和 Redis

 

目录索引 

 

【无私分享:ASP.NET CORE 项目实战】目录索引

 

简介

 

  

  经过 N 久反复的尝试,翻阅了网上无数的资料,GitHub上下载了十几个源码参考, Memory 和 Redis 终于写出一个 简陋 的 封装,为了统一和易用,我们两种缓存都统一实现了一个接口 ICacheService,微软也有很多是通过IDistributedCache,大家可以参考 https://docs.asp.net/en/latest/performance/caching/distributed.html ,GitHub上也有很多很好的封装,这里我们就不一一介绍了,大家自行参考,现在搞 Asp.net Core的还是不是很多,中文的资料也少的可怜,而且基本都是千篇一律照搬,对于只认识 ABCDEFG的我来说,过程是十分艰辛的,一篇文章往往要看四五遍,逐行逐句翻译,说多了都是泪,不说了,我们开始。期间,得到了很多朋友的帮助,在此表示感谢!

  

 

缓存接口 ICacheService

 

   缓存也好,数据库也好,我们就是进行CRUD操作,接口没什么好解释的,注释我写的很明白,这里就列给大家:

 

  #  验证缓存项是否存在

 

 1         /// <summary>
 2         /// 验证缓存项是否存在
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         bool Exists(string key);
 7 
 8         /// <summary>
 9         /// 验证缓存项是否存在(异步方式)
10         /// </summary>
11         /// <param name="key">缓存Key</param>
12         /// <returns></returns>
13         Task<bool> ExistsAsync(string key);  

 

  # 添加缓存

 

 1  /// <summary>
 2         /// 添加缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <param name="value">缓存Value</param>
 6         /// <returns></returns>
 7         bool Add(string key, object value);
 8 
 9         /// <summary>
10         /// 添加缓存(异步方式)
11         /// </summary>
12         /// <param name="key">缓存Key</param>
13         /// <param name="value">缓存Value</param>
14         /// <returns></returns>
15         Task<bool> AddAsync(string key, object value);
16 
17         /// <summary>
18         /// 添加缓存
19         /// </summary>
20         /// <param name="key">缓存Key</param>
21         /// <param name="value">缓存Value</param>
22         /// <param name="expiresSliding">滑动过期时长(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
23         /// <param name="expiressAbsoulte">绝对过期时长</param>
24         /// <returns></returns>
25         bool Add(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);
26 
27         /// <summary>
28         /// 添加缓存(异步方式)
29         /// </summary>
30         /// <param name="key">缓存Key</param>
31         /// <param name="value">缓存Value</param>
32         /// <param name="expiresSliding">滑动过期时长(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
33         /// <param name="expiressAbsoulte">绝对过期时长</param>
34         /// <returns></returns>
35         Task<bool> AddAsync(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);
36 
37         /// <summary>
38         /// 添加缓存
39         /// </summary>
40         /// <param name="key">缓存Key</param>
41         /// <param name="value">缓存Value</param>
42         /// <param name="expiresIn">缓存时长</param>
43         /// <param name="isSliding">是否滑动过期(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
44         /// <returns></returns>
45         bool Add(string key, object value, TimeSpan expiresIn, bool isSliding = false);
46 
47         /// <summary>
48         /// 添加缓存(异步方式)
49         /// </summary>
50         /// <param name="key">缓存Key</param>
51         /// <param name="value">缓存Value</param>
52         /// <param name="expiresIn">缓存时长</param>
53         /// <param name="isSliding">是否滑动过期(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
54         /// <returns></returns>
55         Task<bool> AddAsync(string key, object value, TimeSpan expiresIn, bool isSliding = false);

 

   # 删除缓存

 

 1  /// <summary>
 2         /// 删除缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         bool Remove(string key);
 7 
 8         /// <summary>
 9         /// 删除缓存(异步方式)
10         /// </summary>
11         /// <param name="key">缓存Key</param>
12         /// <returns></returns>
13         Task<bool> RemoveAsync(string key);
14 
15         /// <summary>
16         /// 批量删除缓存
17         /// </summary>
18         /// <param name="key">缓存Key集合</param>
19         /// <returns></returns>
20         void RemoveAll(IEnumerable<string> keys);
21 
22         /// <summary>
23         /// 批量删除缓存(异步方式)
24         /// </summary>
25         /// <param name="key">缓存Key集合</param>
26         /// <returns></returns>
27         Task RemoveAllAsync(IEnumerable<string> keys);

 

     # 获取缓存

 

 1 /// <summary>
 2         /// 获取缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         T Get<T>(string key) where T : class;
 7 
 8         /// <summary>
 9         /// 获取缓存(异步方式)
10         /// </summary>
11         /// <param name="key">缓存Key</param>
12         /// <returns></returns>
13         Task<T> GetAsync<T>(string key) where T : class;
14 
15         /// <summary>
16         /// 获取缓存
17         /// </summary>
18         /// <param name="key">缓存Key</param>
19         /// <returns></returns>
20         object Get(string key);
21 
22         /// <summary>
23         /// 获取缓存(异步方式)
24         /// </summary>
25         /// <param name="key">缓存Key</param>
26         /// <returns></returns>
27         Task<object> GetAsync(string key);
28 
29         /// <summary>
30         /// 获取缓存集合
31         /// </summary>
32         /// <param name="keys">缓存Key集合</param>
33         /// <returns></returns>
34         IDictionary<string, object> GetAll(IEnumerable<string> keys);
35 
36         /// <summary>
37         /// 获取缓存集合(异步方式)
38         /// </summary>
39         /// <param name="keys">缓存Key集合</param>
40         /// <returns></returns>
41         Task<IDictionary<string, object>> GetAllAsync(IEnumerable<string> keys);

 

  # 修改缓存 

 

 1 /// <summary>
 2         /// 修改缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <param name="value">新的缓存Value</param>
 6         /// <returns></returns>
 7         bool Replace(string key, object value);
 8 
 9         /// <summary>
10         /// 修改缓存(异步方式)
11         /// </summary>
12         /// <param name="key">缓存Key</param>
13         /// <param name="value">新的缓存Value</param>
14         /// <returns></returns>
15         Task<bool> ReplaceAsync(string key, object value);
16 
17         /// <summary>
18         /// 修改缓存
19         /// </summary>
20         /// <param name="key">缓存Key</param>
21         /// <param name="value">新的缓存Value</param>
22         /// <param name="expiresSliding">滑动过期时长(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
23         /// <param name="expiressAbsoulte">绝对过期时长</param>
24         /// <returns></returns>
25         bool Replace(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);
26 
27         /// <summary>
28         /// 修改缓存(异步方式)
29         /// </summary>
30         /// <param name="key">缓存Key</param>
31         /// <param name="value">新的缓存Value</param>
32         /// <param name="expiresSliding">滑动过期时长(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
33         /// <param name="expiressAbsoulte">绝对过期时长</param>
34         /// <returns></returns>
35         Task<bool> ReplaceAsync(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);
36 
37         /// <summary>
38         /// 修改缓存
39         /// </summary>
40         /// <param name="key">缓存Key</param>
41         /// <param name="value">新的缓存Value</param>
42         /// <param name="expiresIn">缓存时长</param>
43         /// <param name="isSliding">是否滑动过期(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
44         /// <returns></returns>
45         bool Replace(string key, object value, TimeSpan expiresIn, bool isSliding = false);
46 
47         /// <summary>
48         /// 修改缓存(异步方式)
49         /// </summary>
50         /// <param name="key">缓存Key</param>
51         /// <param name="value">新的缓存Value</param>
52         /// <param name="expiresIn">缓存时长</param>
53         /// <param name="isSliding">是否滑动过期(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
54         /// <returns></returns>
55         Task<bool> ReplaceAsync(string key, object value, TimeSpan expiresIn, bool isSliding = false);

 

 

缓存实现类 MemoryCache

 

  MemoryCache 这个比较简单,有微软比较完善的文档和一些比较好的文章,这个大家都用好久了。

  我们新建一个缓存实现类 MemoryCacheService 实现接口 ICacheService

  public class MemoryCacheService :ICacheService { }

  通过构造器注入 IMemoryCache

  protected IMemoryCache _cache;

  public MemoryCacheService(IMemoryCache cache)
  {
    _cache = cache;
  }

  

  实现接口的方法,我们的方法都带有 异步 同步 两种,我们节约篇章和时间,异步的就不大家写了,大家自己添加一下就好。

 

  #  验证缓存项是否存在

  在MemoryCache中,我们是通过 TryGetValue 来检测 Key是否存在的

  

 1 /// <summary>
 2         /// 验证缓存项是否存在
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         public bool Exists(string key)
 7         {
 8             if (key == null)
 9             {
10                 throw new ArgumentNullException(nameof(key));
11             }
12             object cached;
13             return _cache.TryGetValue(key,out cached);
14         }

 

  # 添加缓存

  三个添加方法 :

  

 1 /// <summary>
 2         /// 添加缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <param name="value">缓存Value</param>
 6         /// <returns></returns>
 7         public bool Add(string key, object value)
 8         {
 9             if (key == null)
10             {
11                 throw new ArgumentNullException(nameof(key));
12             }
13             if (value == null)
14             {
15                 throw new ArgumentNullException(nameof(value));
16             }
17             _cache.Set(key, value);
18             return Exists(key);
19         }
20 /// <summary>
21         /// 添加缓存
22         /// </summary>
23         /// <param name="key">缓存Key</param>
24         /// <param name="value">缓存Value</param>
25         /// <param name="expiresSliding">滑动过期时长(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
26         /// <param name="expiressAbsoulte">绝对过期时长</param>
27         /// <returns></returns>
28         public bool Add(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
29         {
30             if (key == null)
31             {
32                 throw new ArgumentNullException(nameof(key));
33             }
34             if (value == null)
35             {
36                 throw new ArgumentNullException(nameof(value));
37             }
38             _cache.Set(key, value,
39                     new MemoryCacheEntryOptions()
40                     .SetSlidingExpiration(expiresSliding)
41                     .SetAbsoluteExpiration(expiressAbsoulte)
42                     );
43 
44             return Exists(key);
45         }
46  /// <summary>
47         /// 添加缓存
48         /// </summary>
49         /// <param name="key">缓存Key</param>
50         /// <param name="value">缓存Value</param>
51         /// <param name="expiresIn">缓存时长</param>
52         /// <param name="isSliding">是否滑动过期(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
53         /// <returns></returns>
54         public bool Add(string key, object value, TimeSpan expiresIn,bool isSliding = false)
55         {
56             if (key == null)
57             {
58                 throw new ArgumentNullException(nameof(key));
59             }
60             if (value == null)
61             {
62                 throw new ArgumentNullException(nameof(value));
63             }
64             if (isSliding)
65             _cache.Set(key, value,
66                 new MemoryCacheEntryOptions()
67                 .SetSlidingExpiration(expiresIn)
68                 );
69             else
70                 _cache.Set(key, value,
71                 new MemoryCacheEntryOptions()
72                 .SetAbsoluteExpiration(expiresIn)
73                 );
74 
75             return Exists(key);
76         }

 

 

 

  # 删除缓存

  单个删除 和 批量删除

 

 1 /// <summary>
 2         /// 删除缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         public bool Remove(string key)
 7         {
 8             if (key == null)
 9             {
10                 throw new ArgumentNullException(nameof(key));
11             }
12             _cache.Remove(key);
13 
14             return !Exists(key);
15         }
16 /// <summary>
17         /// 批量删除缓存
18         /// </summary>
19         /// <param name="key">缓存Key集合</param>
20         /// <returns></returns>
21         public void RemoveAll(IEnumerable<string> keys)
22         {
23             if (keys == null)
24             {
25                 throw new ArgumentNullException(nameof(keys));
26             }
27 
28             keys.ToList().ForEach(item => _cache.Remove(item));
29         }

 

  # 获取缓存

 

 1 /// <summary>
 2         /// 获取缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         public T Get<T>(string key) where T : class
 7         {
 8             if (key == null)
 9             {
10                 throw new ArgumentNullException(nameof(key));
11             }
12             return _cache.Get(key) as T;
13         }
14 /// <summary>
15         /// 获取缓存
16         /// </summary>
17         /// <param name="key">缓存Key</param>
18         /// <returns></returns>
19         public object Get(string key)
20         {
21             if (key == null)
22             {
23                 throw new ArgumentNullException(nameof(key));
24             }
25             return _cache.Get(key);
26         }
27 /// <summary>
28         /// 获取缓存集合
29         /// </summary>
30         /// <param name="keys">缓存Key集合</param>
31         /// <returns></returns>
32         public IDictionary<string, object> GetAll(IEnumerable<string> keys)
33         {
34             if (keys == null)
35             {
36                 throw new ArgumentNullException(nameof(keys));
37             }
38 
39             var dict = new Dictionary<string, object>();
40 
41             keys.ToList().ForEach(item => dict.Add(item, _cache.Get(item)));
42 
43             return dict;
44         }

 

  # 修改缓存

 1  /// <summary>
 2         /// 修改缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <param name="value">新的缓存Value</param>
 6         /// <returns></returns>
 7         public bool Replace(string key, object value)
 8         {
 9             if (key == null)
10             {
11                 throw new ArgumentNullException(nameof(key));
12             }
13             if (value == null)
14             {
15                 throw new ArgumentNullException(nameof(value));
16             }
17             if (Exists(key))
18                 if (!Remove(key)) return false;
19 
20             return Add(key, value);
21 
22         }
23 /// <summary>
24         /// 修改缓存
25         /// </summary>
26         /// <param name="key">缓存Key</param>
27         /// <param name="value">新的缓存Value</param>
28         /// <param name="expiresSliding">滑动过期时长(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
29         /// <param name="expiressAbsoulte">绝对过期时长</param>
30         /// <returns></returns>
31         public bool Replace(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
32         {
33             if (key == null)
34             {
35                 throw new ArgumentNullException(nameof(key));
36             }
37             if (value == null)
38             {
39                 throw new ArgumentNullException(nameof(value));
40             }
41             if (Exists(key))
42                 if (!Remove(key)) return false;
43 
44             return Add(key, value, expiresSliding, expiressAbsoulte);
45         }
46 /// <summary>
47         /// 修改缓存
48         /// </summary>
49         /// <param name="key">缓存Key</param>
50         /// <param name="value">新的缓存Value</param>
51         /// <param name="expiresIn">缓存时长</param>
52         /// <param name="isSliding">是否滑动过期(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
53         /// <returns></returns>
54         public bool Replace(string key, object value, TimeSpan expiresIn, bool isSliding = false)
55         {
56             if (key == null)
57             {
58                 throw new ArgumentNullException(nameof(key));
59             }
60             if (value == null)
61             {
62                 throw new ArgumentNullException(nameof(value));
63             }
64             if (Exists(key))
65                 if (!Remove(key)) return false;
66 
67             return Add(key, value, expiresIn, isSliding);
68         }

 

  最后 释放:

  public void Dispose()
  {
    if (_cache != null)
      _cache.Dispose();
    GC.SuppressFinalize(this);
  }

 

 

缓存实现类 Redis

 

  Redis一般都是运行的Liunx的,我们在 【(第十章)】发布项目到 Linux 上运行 Core 项目 中介绍了,如何在Linux上开发运行Core项目,当然,我相信,很多朋友还是在 Windows 上做开发、测试的,这里给大家一个windows 上的Redis和管理软件,如果没有或者不知道怎么找的朋友可以下载下来,在windows上测试 Redis :连接可能失效  百度网盘 提取码:uglb    百度网盘 提取码:gl0e

  安装第一个后,启动Redis服务就行了,管理软件的界面也很简洁

  

  

 

  我们先来看我们的 RedisCacheService:

  为了统一管理和切换使用,我们的 RedisCacheService 同样实现接口 ICacheService

  public class RedisCacheService : ICacheService { }

  同样,我们通过构造器注入:

  

  protected IDatabase _cache;

  private ConnectionMultiplexer _connection;

  private readonly string _instance;


  public RedisCacheService(RedisCacheOptions options, int database = 0)
  {
    _connection = ConnectionMultiplexer.Connect(options.Configuration);
    _cache = _connection.GetDatabase(database);
    _instance = options.InstanceName;
  }

  

  说明一下:我们需要添加一个Redis包:Microsoft.Extensions.Caching.Redis,这是官方的,但是不知道是我程序的原因还是什么原因,总是还原失败,命令强行还原包也不行,所以 我用的是移植的包: Microsoft.Extensions.Caching.Redis.Core,如果你们可以,最好还是用官方的包。

 

  这里我们写了个方法,来组合Key值和实例名,就是Key值转为 实例名+Key   

  public string GetKeyForRedis(string key)
  {
    return _instance + key;
  }

 

  # 验证缓存项是否存在

 

 1 /// <summary>
 2         /// 验证缓存项是否存在
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         public bool Exists(string key)
 7         {
 8             if (key == null)
 9             {
10                 throw new ArgumentNullException(nameof(key));
11             }
12             return _cache.KeyExists(GetKeyForRedis(key));
13         }

 

 

  # 添加缓存

 

  注意:我翻阅了很多资料,没有找到Redis支持滑动和绝对过期,但是都是继承的统一接口,所以这里添加方法 滑动过期时没有用的。

 

 1 /// <summary>
 2         /// 添加缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <param name="value">缓存Value</param>
 6         /// <returns></returns>
 7         public bool Add(string key, object value)
 8         {
 9             if (key == null)
10             {
11                 throw new ArgumentNullException(nameof(key));
12             }
13            return _cache.StringSet(GetKeyForRedis(key), Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(value)));
14         }
15 /// <summary>
16         /// 添加缓存
17         /// </summary>
18         /// <param name="key">缓存Key</param>
19         /// <param name="value">缓存Value</param>
20         /// <param name="expiresSliding">滑动过期时长(如果在过期时间内有操作,则以当前时间点延长过期时间,Redis中无效)</param>
21         /// <param name="expiressAbsoulte">绝对过期时长</param>
22         /// <returns></returns>
23         public bool Add(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
24         {
25             if (key == null)
26             {
27                 throw new ArgumentNullException(nameof(key));
28             }
29             return  _cache.StringSet(GetKeyForRedis(key), Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(value)),expiressAbsoulte);
30         }
31 /// <summary>
32         /// 添加缓存
33         /// </summary>
34         /// <param name="key">缓存Key</param>
35         /// <param name="value">缓存Value</param>
36         /// <param name="expiresIn">缓存时长</param>
37         /// <param name="isSliding">是否滑动过期(如果在过期时间内有操作,则以当前时间点延长过期时间,Redis中无效)</param>
38         /// <returns></returns>
39         public bool Add(string key, object value, TimeSpan expiresIn, bool isSliding = false)
40         {
41             if (key == null)
42             {
43                 throw new ArgumentNullException(nameof(key));
44             }
45 
46 
47             return _cache.StringSet(GetKeyForRedis(key), Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(value)), expiresIn);
48         }

 

  # 删除缓存

 

 1 /// <summary>
 2         /// 删除缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         public bool Remove(string key)
 7         {
 8             if (key == null)
 9             {
10                 throw new ArgumentNullException(nameof(key));
11             }
12             return _cache.KeyDelete(GetKeyForRedis(key));
13         }
14 /// <summary>
15         /// 批量删除缓存
16         /// </summary>
17         /// <param name="key">缓存Key集合</param>
18         /// <returns></returns>
19         public void RemoveAll(IEnumerable<string> keys)
20         {
21             if (keys == null)
22             {
23                 throw new ArgumentNullException(nameof(keys));
24             }
25 
26             keys.ToList().ForEach(item => Remove(item));
27         }

 

  # 获取缓存

 

 1 /// <summary>
 2         /// 获取缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <returns></returns>
 6         public T Get<T>(string key) where T : class
 7         {
 8             if (key == null)
 9             {
10                 throw new ArgumentNullException(nameof(key));
11             }
12 
13             var value = _cache.StringGet(GetKeyForRedis(key));
14 
15             if (!value.HasValue)
16             {
17                 return default(T);
18             }
19 
20             return JsonConvert.DeserializeObject<T>(value);
21         }
22 /// <summary>
23         /// 获取缓存
24         /// </summary>
25         /// <param name="key">缓存Key</param>
26         /// <returns></returns>
27         public object Get(string key)
28         {
29             if (key == null)
30             {
31                 throw new ArgumentNullException(nameof(key));
32             }
33 
34             var value = _cache.StringGet(GetKeyForRedis(key));
35 
36             if(!value.HasValue)
37             {
38                 return null;
39             }
40 /// <summary>
41         /// 获取缓存集合
42         /// </summary>
43         /// <param name="keys">缓存Key集合</param>
44         /// <returns></returns>
45         public IDictionary<string, object> GetAll(IEnumerable<string> keys)
46         {
47             if (keys == null)
48             {
49                 throw new ArgumentNullException(nameof(keys));
50             }
51             var dict = new Dictionary<string, object>();
52 
53             keys.ToList().ForEach(item => dict.Add(item, Get(GetKeyForRedis(item))));
54 
55             return dict;
56         }
57 
58             return JsonConvert.DeserializeObject(value);
59         }

 

  # 修改缓存

 

 1 /// <summary>
 2         /// 修改缓存
 3         /// </summary>
 4         /// <param name="key">缓存Key</param>
 5         /// <param name="value">新的缓存Value</param>
 6         /// <returns></returns>
 7         public bool Replace(string key, object value)
 8         {
 9             if (key == null)
10             {
11                 throw new ArgumentNullException(nameof(key));
12             }
13 
14             if(Exists(key))
15                 if (!Remove(key))
16                     return false;
17 
18             return Add(key, value);
19 
20         }
21 /// <summary>
22         /// 修改缓存
23         /// </summary>
24         /// <param name="key">缓存Key</param>
25         /// <param name="value">新的缓存Value</param>
26         /// <param name="expiresSliding">滑动过期时长(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
27         /// <param name="expiressAbsoulte">绝对过期时长</param>
28         /// <returns></returns>
29         public bool Replace(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
30         {
31             if (key == null)
32             {
33                 throw new ArgumentNullException(nameof(key));
34             }
35 
36             if (Exists(key))
37                 if (!Remove(key))
38                     return false;
39 
40             return Add(key, value, expiresSliding, expiressAbsoulte);
41         }
42 /// <summary>
43         /// 修改缓存
44         /// </summary>
45         /// <param name="key">缓存Key</param>
46         /// <param name="value">新的缓存Value</param>
47         /// <param name="expiresIn">缓存时长</param>
48         /// <param name="isSliding">是否滑动过期(如果在过期时间内有操作,则以当前时间点延长过期时间)</param>
49         /// <returns></returns>
50         public bool Replace(string key, object value, TimeSpan expiresIn, bool isSliding = false)
51         {
52             if (key == null)
53             {
54                 throw new ArgumentNullException(nameof(key));
55             }
56 
57             if (Exists(key))
58                 if (!Remove(key)) return false;
59 
60             return Add(key, value, expiresIn, isSliding);
61         }

 

  同样,释放:

  public void Dispose()
  {
    if (_connection != null)
      _connection.Dispose();
    GC.SuppressFinalize(this);
  }

 

Startup.cs 和 缓存配置

 

  我们在 【(第八章)】读取配置文件(二) 读取自定义配置文件 中讲到了如何读取自定义配置文件,同样,我们把缓存的配置 也放在 我们的自定义配置文件siteconfig.json中:

 

  

  

  我们写一个类,来获取配置几个配置:

  CacheProvider: _isUseRedis        --- 是否使用Redis

          _connectionString   --- Redis连接       

          _instanceName     ---Redis实例名称   

 

 

  在 Startup.cs 的 ConfigureServices(IServiceCollection services) 中:

 

  首先添加:services.AddMemoryCache();

  判断是否使用Redis,如果不使用 Redis就默认使用 MemoryCache:  

  if (_cacheProvider._isUseRedis)
  {
    //Use Redis
    services.AddSingleton(typeof(ICacheService), new RedisCacheService(new RedisCacheOptions
    {
      Configuration = _cacheProvider._connectionString,
      InstanceName = _cacheProvider._instanceName
    },0));
  }
  else
  {
    //Use MemoryCache
    services.AddSingleton<IMemoryCache>(factory =>
    {
      var cache = new MemoryCache(new MemoryCacheOptions());
      return cache;
      });
    services.AddSingleton<ICacheService, MemoryCacheService>();
  }

 

  

 

 

 

  OK,完成了,因为也是研究Core不到一个月,所以这里面肯定会有些地方写的不好,希望大家指出来,如果有更高的方案或者方法,也麻烦告知一声,在此表示感谢!

 

 

 

 

 

希望跟大家一起学习Asp.net Core 

刚开始接触,水平有限,很多东西都是自己的理解和翻阅网上大神的资料,如果有不对的地方和不理解的地方,希望大家指正!

虽然Asp.net Core 现在很火热,但是网上的很多资料都是前篇一律的复制,所以有很多问题我也暂时没有解决,希望大家能共同帮助一下!

 

原创文章 转载请尊重劳动成果 http://yuangang.cnblogs.com

 

posted @ 2016-08-23 17:06  果冻布丁喜之郎  阅读(...)  评论(...编辑  收藏