C#中如何使用redis

public class RedisHelper
  {
    private static ConnectionMultiplexer multiplexer { get; set; }
    static RedisHelper()
    {
    }

    public static IDatabase GetDataBase(int dbNums = 1)
    {
      if (multiplexer == null)
        Init();
      return multiplexer.GetDatabase(dbNums);
    }

    public static ConnectionMultiplexer GetMultiplexer()
    {
      if (multiplexer == null)
        Init();

      return multiplexer;
    }
    public static bool IsConnect(string key, IDatabase redisDb, string module, string action)
    {
      if (!redisDb.IsConnected(key))
      {
        LogHelper.Error("current redis is not connect", null, module, action);
        return false;
      }
      return true;
    }

    private static void Init()
    {
      try
      {
        var configString = ConfigurationManager.AppSettings["RedisConfigString"];
        ConfigurationOptions options = ConfigurationOptions.Parse(configString);
        multiplexer = ConnectionMultiplexer.Connect(options);
      }
      catch (Exception ex)
      {
        LogHelper.Error(ex, "RedisHelper", "Static");
      }
    }
  }

IDatabase _cacheClient = RedisHelper.GetDataBase(4);
//key是否存在
_cacheClient.KeyExists("key")
//设置key-vaule
_cacheClient.StringSet("key", "value");
//设置过期时间
_cacheClient.KeyExpire("key", TimeSpan.FromMinutes(1));
//删除
_cacheClient.KeyDelete("key");

//发布
ConnectionMultiplexer multiplexer = RedisHelper.GetMultiplexer();
ISubscriber sub = multiplexer.GetSubscriber();
var queue = sub.Publish("channel name", "message");

//订阅
ConnectionMultiplexer multiplexer = RedisHelper.GetMultiplexer();
ISubscriber sub = multiplexer.GetSubscriber();
sub.Subscribe("channel name", (channel, message) =>
{
  //TODO
});

//取值，不存在则初始为0
long num = _cacheClient.StringIncrement("key", 0)

//判断，比如和缓存里的商品总库存比较

//计数增加
_cacheClient.StringIncrement("key", 2)