项目实战 redis 缓存

Posted 2020-10-06

1 首先在你的项目中，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RedisCacheHel

using ServiceStack.Redis;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Web;

namespace WEBJSM.Models
{
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. 配置文件写在web.config   的  appSettings 节点下

<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" />

 

 

 

4. 测试程序调用

RedisCacheHelper.Add("name1", UserDspName, DateTime.Now.AddDays(1)); //存数据
string str = RedisCacheHelper.Get<string>("name1"); //取数据