发布:2022/7/28 16:12:35作者:管理员 来源:本站 浏览次数:924
上一篇讲述了安装redis《Redis总结(一)Redis安装》,同时也大致介绍了redis的优势和应用场景。本篇着重讲解.NET中如何使用redis和C#。
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 ;
}
}
}
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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-->
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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();
}
}
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5. 输出结果
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