C#中如何使用redis

Redis官网提供了很多开源的C#客户端。例如，Nhiredis ，ServiceStack.Redis ，StackExchange.Redis等。其中ServiceStack.Redis应该算是比较流行的。它提供了一整套从Redis数据结构都强类型对象转换的机制并将对象json序列化。所以这里只介绍ServiceStack.Redis，它也是目前我们产品中所使用的客户端。 

 

　　ServiceStack.Redis地址：https://github.com/ServiceStack/ServiceStack.Redis 

 

　　1. 建立一个控制台应用程序，并引用以下ServiceStack.Redis相关的四个类库。或者通过Nuget进行安装Redis常用组件ServiceStack.Redis。 下载示例代码。

      

 

　　2. 创建一个Redis操作的公用类RedisCacheHelper，

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using  System; using  System.Collections.Generic; using  System.Configuration; using  System.Linq; using  System.Text; using  System.Web; using  ServiceStack.Common.Extensions; using  ServiceStack.Redis; using  ServiceStack.Logging;   namespace  Weiz.Redis.RedisTest {      public  class  RedisCacheHelper      {          private  static  readonly  PooledRedisClientManager pool =  null ;          private  static  readonly  string [] redisHosts =  null ;          public  static  int  RedisMaxReadPool =  int .Parse(ConfigurationManager.AppSettings[ "redis_max_read_pool" ]);          public  static  int  RedisMaxWritePool =  int .Parse(ConfigurationManager.AppSettings[ "redis_max_write_pool" ]);            static  RedisCacheHelper()          {              var  redisHostStr = ConfigurationManager.AppSettings[ "redis_server_session" ];                if  (! string .IsNullOrEmpty(redisHostStr))              {                  redisHosts = redisHostStr.Split( ',' );                    if  (redisHosts.Length > 0)                  {                      pool =  new  PooledRedisClientManager(redisHosts, redisHosts,                          new  RedisClientManagerConfig()                          {                              MaxWritePoolSize = RedisMaxWritePool,                              MaxReadPoolSize = RedisMaxReadPool,                              AutoStart =  true                          });                  }              }          }          public  static  void  Add<T>( string  key, T value, DateTime expiry)          {              if  (value ==  null )              {                  return ;              }                if  (expiry <= DateTime.Now)              {                  Remove(key);                    return ;              }                try              {                  if  (pool !=  null )                  {                      using  ( var  r = pool.GetClient())                      {                          if  (r !=  null )                          {                              r.SendTimeout = 1000;                              r.Set(key, value, expiry - DateTime.Now);                          }                      }                  }              }              catch  (Exception ex)              {                  string  msg =  string .Format( "{0}:{1}发生异常!{2}" ,  "cache" ,  "存储" , key);              }            }            public  static  void  Add<T>( string  key, T value, TimeSpan slidingExpiration)          {              if  (value ==  null )              {                  return ;              }                if  (slidingExpiration.TotalSeconds <= 0)              {                  Remove(key);                    return ;              }                try              {                  if  (pool !=  null )                  {                      using  ( var  r = pool.GetClient())                      {                          if  (r !=  null )                          {                              r.SendTimeout = 1000;                              r.Set(key, value, slidingExpiration);                          }                      }                  }              }              catch  (Exception ex)              {                  string  msg =  string .Format( "{0}:{1}发生异常!{2}" ,  "cache" ,  "存储" , key);              }            }                public  static  T Get<T>( string  key)          {              if  ( string .IsNullOrEmpty(key))              {                  return  default (T);              }                T obj =  default (T);                try              {                  if  (pool !=  null )                  {                      using  ( var  r = pool.GetClient())                      {                          if  (r !=  null )                          {                              r.SendTimeout = 1000;                              obj = r.Get<T>(key);                          }                      }                  }              }              catch  (Exception ex)              {                  string  msg =  string .Format( "{0}:{1}发生异常!{2}" ,  "cache" ,  "获取" , key);              }                  return  obj;          }            public  static  void  Remove( string  key)          {              try              {                  if  (pool !=  null )                  {                      using  ( var  r = pool.GetClient())                      {                          if  (r !=  null )                          {                              r.SendTimeout = 1000;                              r.Remove(key);                          }                      }                  }              }              catch  (Exception ex)              {                  string  msg =  string .Format( "{0}:{1}发生异常!{2}" ,  "cache" ,  "删除" , key);              }            }            public  static  bool  Exists( string  key)          {              try              {                  if  (pool !=  null )                  {                      using  ( var  r = pool.GetClient())                      {                          if  (r !=  null )                          {                              r.SendTimeout = 1000;                              return  r.ContainsKey(key);                          }                      }                  }              }              catch  (Exception ex)              {                  string  msg =  string .Format( "{0}:{1}发生异常!{2}" ,  "cache" ,  "是否存在" , key);              }                return  false ;          }      } }

　　说明：RedisCacheHelper 使用的是客户端链接池模式，这样的存取效率应该是最高的。同时也更方便的支持读写分离，均衡负载。

 

　　3. 配置文件

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<!-- redis Start   --> <add key= "SessionExpireMinutes"  value= "180"  /> <add key= "redis_server_session"  value= "127.0.0.1:6379"  /> <add key= "redis_max_read_pool"  value= "3"  /> <add key= "redis_max_write_pool"  value= "1"  /> <!--redis end-->

　

　　4. 测试程序调用

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class  Program      {          static  void  Main( string [] args)          {              Console.WriteLine( "Redis写入缓存：zhong" );                RedisCacheHelper.Add( "zhong" ,  "zhongzhongzhong" , DateTime.Now.AddDays(1));                Console.WriteLine( "Redis获取缓存：zhong" );                string  str3 = RedisCacheHelper.Get< string >( "zhong" );                Console.WriteLine(str3);                Console.WriteLine( "Redis获取缓存：nihao" );              string  str = RedisCacheHelper.Get< string >( "nihao" );              Console.WriteLine(str);                  Console.WriteLine( "Redis获取缓存：wei" );              string  str1 = RedisCacheHelper.Get< string >( "wei" );              Console.WriteLine(str1);                Console.ReadKey();          }      }

　　

　　5. 输出结果