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Asp.net Core 快取 MemoryCache 和 Redis

https://blog.csdn.net/warrior21st/article/details/62884629

快取介面 ICacheService

 

   快取也好,資料庫也好,我們就是進行CRUD操作,介面沒什麼好解釋的,註釋我寫的很明白,這裡就列給大家:

 

  #  驗證快取項是否存在

 

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 1         /// <summary>
 2         /// 驗證快取項是否存在
 3         /// </summary>
 4         /// <param name="key">快取Key</param>
 5         /// <returns></returns>
 6         bool Exists(string key);
 7 
 8         /// <summary>
 9         /// 驗證快取項是否存在(非同步方式)
10         /// </summary>
11         /// <param name="key">快取Key</param>
12         /// <returns></returns>
13         Task<bool> ExistsAsync(string key);  

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  # 新增快取

 

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 1  /// <summary>
 2         /// 新增快取
 3         /// </summary>
 4         /// <param name="key">快取Key</param>
 5         /// <param name="value">快取Value</param>
 6         /// <returns></returns>
 7         bool Add(string key, object value);
 8 
 9         /// <summary>
10         /// 新增快取(非同步方式)
11         /// </summary>
12         /// <param name="key">快取Key</param>
13         /// <param name="value">快取Value</param>
14         /// <returns></returns>
15         Task<bool> AddAsync(string key, object value);
16 
17         /// <summary>
18         /// 新增快取
19         /// </summary>
20         /// <param name="key">快取Key</param>
21         /// <param name="value">快取Value</param>
22         /// <param name="expiresSliding">滑動過期時長(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
23         /// <param name="expiressAbsoulte">絕對過期時長</param>
24         /// <returns></returns>
25         bool Add(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);
26 
27         /// <summary>
28         /// 新增快取(非同步方式)
29         /// </summary>
30         /// <param name="key">快取Key</param>
31         /// <param name="value">快取Value</param>
32         /// <param name="expiresSliding">滑動過期時長(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
33         /// <param name="expiressAbsoulte">絕對過期時長</param>
34         /// <returns></returns>
35         Task<bool> AddAsync(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);
36 
37         /// <summary>
38         /// 新增快取
39         /// </summary>
40         /// <param name="key">快取Key</param>
41         /// <param name="value">快取Value</param>
42         /// <param name="expiresIn">快取時長</param>
43         /// <param name="isSliding">是否滑動過期(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
44         /// <returns></returns>
45         bool Add(string key, object value, TimeSpan expiresIn, bool isSliding = false);
46 
47         /// <summary>
48         /// 新增快取(非同步方式)
49         /// </summary>
50         /// <param name="key">快取Key</param>
51         /// <param name="value">快取Value</param>
52         /// <param name="expiresIn">快取時長</param>
53         /// <param name="isSliding">是否滑動過期(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
54         /// <returns></returns>
55         Task<bool> AddAsync(string key, object value, TimeSpan expiresIn, bool isSliding = false);

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   # 刪除快取

 

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

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     # 獲取快取

 

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

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  # 修改快取 

 

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 1 /// <summary>
 2         /// 修改快取
 3         /// </summary>
 4         /// <param name="key">快取Key</param>
 5         /// <param name="value">新的快取Value</param>
 6         /// <returns></returns>
 7         bool Replace(string key, object value);
 8 
 9         /// <summary>
10         /// 修改快取(非同步方式)
11         /// </summary>
12         /// <param name="key">快取Key</param>
13         /// <param name="value">新的快取Value</param>
14         /// <returns></returns>
15         Task<bool> ReplaceAsync(string key, object value);
16 
17         /// <summary>
18         /// 修改快取
19         /// </summary>
20         /// <param name="key">快取Key</param>
21         /// <param name="value">新的快取Value</param>
22         /// <param name="expiresSliding">滑動過期時長(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
23         /// <param name="expiressAbsoulte">絕對過期時長</param>
24         /// <returns></returns>
25         bool Replace(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);
26 
27         /// <summary>
28         /// 修改快取(非同步方式)
29         /// </summary>
30         /// <param name="key">快取Key</param>
31         /// <param name="value">新的快取Value</param>
32         /// <param name="expiresSliding">滑動過期時長(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
33         /// <param name="expiressAbsoulte">絕對過期時長</param>
34         /// <returns></returns>
35         Task<bool> ReplaceAsync(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);
36 
37         /// <summary>
38         /// 修改快取
39         /// </summary>
40         /// <param name="key">快取Key</param>
41         /// <param name="value">新的快取Value</param>
42         /// <param name="expiresIn">快取時長</param>
43         /// <param name="isSliding">是否滑動過期(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
44         /// <returns></returns>
45         bool Replace(string key, object value, TimeSpan expiresIn, bool isSliding = false);
46 
47         /// <summary>
48         /// 修改快取(非同步方式)
49         /// </summary>
50         /// <param name="key">快取Key</param>
51         /// <param name="value">新的快取Value</param>
52         /// <param name="expiresIn">快取時長</param>
53         /// <param name="isSliding">是否滑動過期(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
54         /// <returns></returns>
55         Task<bool> ReplaceAsync(string key, object value, TimeSpan expiresIn, bool isSliding = false);

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快取實現類 MemoryCache

 

  MemoryCache 這個比較簡單,有微軟比較完善的文件和一些比較好的文章,這個大家都用好久了。

  我們新建一個快取實現類 MemoryCacheService 實現介面 ICacheService

  public class MemoryCacheService :ICacheService { }

  通過構造器注入 IMemoryCache:

  protected IMemoryCache _cache;

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

  

  實現介面的方法,我們的方法都帶有 非同步 和 同步 兩種,我們節約篇章和時間,非同步的就不大家寫了,大家自己新增一下就好。

 

  #  驗證快取項是否存在

  在MemoryCache中,我們是通過 TryGetValue 來檢測 Key是否存在的

  

複製程式碼

 1 /// <summary>
 2         /// 驗證快取項是否存在
 3         /// </summary>
 4         /// <param name="key">快取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         }

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  # 新增快取

  三個新增方法 :

  

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 1 /// <summary>
 2         /// 新增快取
 3         /// </summary>
 4         /// <param name="key">快取Key</param>
 5         /// <param name="value">快取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         /// 新增快取
22         /// </summary>
23         /// <param name="key">快取Key</param>
24         /// <param name="value">快取Value</param>
25         /// <param name="expiresSliding">滑動過期時長(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
26         /// <param name="expiressAbsoulte">絕對過期時長</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         /// 新增快取
48         /// </summary>
49         /// <param name="key">快取Key</param>
50         /// <param name="value">快取Value</param>
51         /// <param name="expiresIn">快取時長</param>
52         /// <param name="isSliding">是否滑動過期(如果在過期時間內有操作,則以當前時間點延長過期時間)</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         }

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  # 刪除快取

  單個刪除 和 批量刪除

 

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 1 /// <summary>
 2         /// 刪除快取
 3         /// </summary>
 4         /// <param name="key">快取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         /// 批量刪除快取
18         /// </summary>
19         /// <param name="key">快取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         }

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  # 獲取快取

 

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 1 /// <summary>
 2         /// 獲取快取
 3         /// </summary>
 4         /// <param name="key">快取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         /// 獲取快取
16         /// </summary>
17         /// <param name="key">快取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         /// 獲取快取集合
29         /// </summary>
30         /// <param name="keys">快取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         }

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  # 修改快取

複製程式碼

 1  /// <summary>
 2         /// 修改快取
 3         /// </summary>
 4         /// <param name="key">快取Key</param>
 5         /// <param name="value">新的快取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         /// 修改快取
25         /// </summary>
26         /// <param name="key">快取Key</param>
27         /// <param name="value">新的快取Value</param>
28         /// <param name="expiresSliding">滑動過期時長(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
29         /// <param name="expiressAbsoulte">絕對過期時長</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         /// 修改快取
48         /// </summary>
49         /// <param name="key">快取Key</param>
50         /// <param name="value">新的快取Value</param>
51         /// <param name="expiresIn">快取時長</param>
52         /// <param name="isSliding">是否滑動過期(如果在過期時間內有操作,則以當前時間點延長過期時間)</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         }

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  最後 釋放:

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

 

 

快取實現類 Redis

 

  Redis一般都是執行的Liunx的,我們在 【(第十章)】釋出專案到 Linux 上執行 Core 專案 中介紹了,如何在Linux上開發執行Core專案,當然,我相信,很多朋友還是在 Windows 上做開發、測試的,這裡給大家一個windows 上的Redis和管理軟體,如果沒有或者不知道怎麼找的朋友可以下載下來,在windows上測試 Redis :連線可能失效  百度網盤 提取碼:uglb    百度網盤 提取碼:gl0e

  安裝第一個後,啟動Redis服務就行了,管理軟體的介面也很簡潔

  

  

 

  我們先來看我們的 RedisCacheService:

  為了統一管理和切換使用,我們的 RedisCacheService 同樣實現介面 ICacheService

  public class RedisCacheService : ICacheService { }

  同樣,我們通過構造器注入:

  

  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;
  }

  

  說明一下:我們需要新增一個Redis包:Microsoft.Extensions.Caching.Redis,這是官方的,但是不知道是我程式的原因還是什麼原因,總是還原失敗,命令強行還原包也不行,所以 我用的是移植的包: Microsoft.Extensions.Caching.Redis.Core,如果你們可以,最好還是用官方的包。

 

  這裡我們寫了個方法,來組合Key值和例項名,就是Key值轉為 例項名+Key   

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

 

  # 驗證快取項是否存在

 

複製程式碼

 1 /// <summary>
 2         /// 驗證快取項是否存在
 3         /// </summary>
 4         /// <param name="key">快取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         }

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  # 新增快取

 

  注意:我翻閱了很多資料,沒有找到Redis支援滑動和絕對過期,但是都是繼承的統一介面,所以這裡新增方法 滑動過期時沒有用的。

 

複製程式碼

 1 /// <summary>
 2         /// 新增快取
 3         /// </summary>
 4         /// <param name="key">快取Key</param>
 5         /// <param name="value">快取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         /// 新增快取
17         /// </summary>
18         /// <param name="key">快取Key</param>
19         /// <param name="value">快取Value</param>
20         /// <param name="expiresSliding">滑動過期時長(如果在過期時間內有操作,則以當前時間點延長過期時間,Redis中無效)</param>
21         /// <param name="expiressAbsoulte">絕對過期時長</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         /// 新增快取
33         /// </summary>
34         /// <param name="key">快取Key</param>
35         /// <param name="value">快取Value</param>
36         /// <param name="expiresIn">快取時長</param>
37         /// <param name="isSliding">是否滑動過期(如果在過期時間內有操作,則以當前時間點延長過期時間,Redis中無效)</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         }

複製程式碼

 

  # 刪除快取

 

複製程式碼

 1 /// <summary>
 2         /// 刪除快取
 3         /// </summary>
 4         /// <param name="key">快取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         /// 批量刪除快取
16         /// </summary>
17         /// <param name="key">快取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         }

複製程式碼

 

  # 獲取快取

 

複製程式碼

 1 /// <summary>
 2         /// 獲取快取
 3         /// </summary>
 4         /// <param name="key">快取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         /// 獲取快取
24         /// </summary>
25         /// <param name="key">快取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         /// 獲取快取集合
42         /// </summary>
43         /// <param name="keys">快取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         }

複製程式碼

 

  # 修改快取

 

複製程式碼

 1 /// <summary>
 2         /// 修改快取
 3         /// </summary>
 4         /// <param name="key">快取Key</param>
 5         /// <param name="value">新的快取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         /// 修改快取
23         /// </summary>
24         /// <param name="key">快取Key</param>
25         /// <param name="value">新的快取Value</param>
26         /// <param name="expiresSliding">滑動過期時長(如果在過期時間內有操作,則以當前時間點延長過期時間)</param>
27         /// <param name="expiressAbsoulte">絕對過期時長</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         /// 修改快取
44         /// </summary>
45         /// <param name="key">快取Key</param>
46         /// <param name="value">新的快取Value</param>
47         /// <param name="expiresIn">快取時長</param>
48         /// <param name="isSliding">是否滑動過期(如果在過期時間內有操作,則以當前時間點延長過期時間)</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         }

複製程式碼

 

  同樣,釋放:

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

 

Startup.cs 和 快取配置

 

  我們在 【(第八章)】讀取配置檔案(二) 讀取自定義配置檔案 中講到了如何讀取自定義配置檔案,同樣,我們把快取的配置 也放在 我們的自定義配置檔案siteconfig.json中:

 

  

  

  我們寫一個類,來獲取配置幾個配置:

  CacheProvider: _isUseRedis        --- 是否使用Redis

          _connectionString   --- Redis連線       

          _instanceName     ---Redis例項名稱   

 

 

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

 

  首先新增:services.AddMemoryCache();

  判斷是否使用Redis,如果不使用 Redis就預設使用 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>();
  }