Net Core 2.0 Redis

Net Core 2.0 Redis配置、封装帮助类RedisHelper及使用实例

https://www.cnblogs.com/oorz/p/9052498.html

本文目录

1. 摘要

2. Redis配置

3. RedisHelper
   
   4．使用实例 5. 总结

4. 摘要
   
   　　由于內存存取速度远高于磁盘读取的特性，为了程序效率提高性能，通常会把常用的不常变动的数据存储在系统内存中，提升数据读取的速度，在C#下常见的内存操作有微软自带的内存处理、分布式缓存Memcached以及Redis,这里我们介绍Redis分布式缓存，另外两种缓存处理参考《Asp.Net Core 2.0 项目实战（8）Core下缓存操作、序列化操作、JSON操作等Helper集合类》介绍了基于Microsoft.Extensions.Caching.Memory封装CacheHelper缓存帮助类；《Asp.Net Core 2.0 项目实战（5）Memcached踩坑，基于EnyimMemcachedCore整理MemcachedHelper帮助类。》Memcached帮助类。

5. Redis配置
   
   　　在appsettings.json添加相关配置，配置读写redis服务器,多服务器用逗号隔开。

复制代码

//redis分布式缓存

"RedisConfig": {

//是否打开缓存1是0否

"IsOpenCache": "0",

"ReadWriteHosts": "192.168.1.2:6379,192.168.1.3:6379,password=123456",

"ReadOnlyHosts": "192.168.1.2:6379,password=123456"

}

复制代码

1. RedisHelper
   
   　　添加Nuget包StackExchange.Redis和Newtonsoft.Json；设置Key/Value，删除redis缓存。本帮助类我仅本地两台电脑测试过，生产环境暂未使用，现仅供参考。

复制代码

using System;

using System.Collections.Generic;

using Microsoft.Extensions.Logging;

using StackExchange.Redis;

using Newtonsoft.Json;

namespace NC.Common

{

public class RedisHelper

{

//单例模式

public static RedisCommon Default{get { return new RedisCommon(); } }

public static RedisCommon One { get { return new RedisCommon(1, "127.0.0.1:6379"); } }

public static RedisCommon Two { get { return new RedisCommon(2, "127.0.0.1:6379"); } }

}

///

/// Redis操作类

/// 老版用的是ServiceStack.Redis。

/// Net Core使用StackExchange.Redis的nuget包

///

public class RedisCommon

{

public static ILogger Log = UtilLogger.Log;//日志记录

//redis数据库连接字符串

private string _conn = UtilConf.Configuration["RedisConfig:ReadWriteHosts"] ?? "127.0.0.1:6379";

private int _db = 0;

//静态变量 保证各模块使用的是不同实例的相同链接

private static ConnectionMultiplexer connection;

public RedisCommon() { }

///

/// 构造函数

///

///

///

public RedisCommon(int db, string connectStr)

{

_conn = connectStr;

_db = db;

}

///

/// 缓存数据库，数据库连接

///

public ConnectionMultiplexer CacheConnection

{

get

{

try

{

if (connection == null || !connection.IsConnected)

{

connection = new Lazy(() => ConnectionMultiplexer.Connect(_conn)).Value;

}

}

catch (Exception ex)

{

Log.LogError("RedisHelper->CacheConnection 出错\r\n" + ex.ToString());

return null;

}

return connection;

}

}

///

/// 缓存数据库

///

public IDatabase CacheRedis => CacheConnection.GetDatabase(_db);

    #region --KEY/VALUE存取--
    /// <summary>
    /// 单条存值
    /// </summary>
    /// <param name="key">key</param>
    /// <param name="value">The value.</param>
    /// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
    public bool StringSet(string key, string value)
    {
        return CacheRedis.StringSet(key, value);
    }
    /// <summary>
    /// 保存单个key value
    /// </summary>
    /// <param name="key">Redis Key</param>
    /// <param name="value">保存的值</param>
    /// <param name="expiry">过期时间</param>
    /// <returns></returns>
    public bool StringSet(string key, string value, TimeSpan? expiry = default(TimeSpan?))
    {
        return CacheRedis.StringSet(key, value, expiry);
    }
    /// <summary>
    /// 保存多个key value
    /// </summary>
    /// <param name="arr">key</param>
    /// <returns></returns>
    public bool StringSet(KeyValuePair<RedisKey, RedisValue>[] arr)
    {
        return CacheRedis.StringSet(arr);
    }
    /// <summary>
    /// 批量存值
    /// </summary>
    /// <param name="keysStr">key</param>
    /// <param name="valuesStr">The value.</param>
    /// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
    public bool StringSetMany(string[] keysStr, string[] valuesStr)
    {
        var count = keysStr.Length;
        var keyValuePair = new KeyValuePair<RedisKey, RedisValue>[count];
        for (int i = 0; i < count; i++)
        {
            keyValuePair[i] = new KeyValuePair<RedisKey, RedisValue>(keysStr[i], valuesStr[i]);
        }

        return CacheRedis.StringSet(keyValuePair);
    }

    /// <summary>
    /// 保存一个对象
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="key"></param>
    /// <param name="obj"></param>
    /// <returns></returns>
    public bool SetStringKey<T>(string key, T obj, TimeSpan? expiry = default(TimeSpan?))
    {
        string json = JsonConvert.SerializeObject(obj);
        return CacheRedis.StringSet(key, json, expiry);
    }
    /// <summary>
    /// 追加值
    /// </summary>
    /// <param name="key"></param>
    /// <param name="value"></param>
    public void StringAppend(string key, string value)
    {
        ////追加值，返回追加后长度
        long appendlong = CacheRedis.StringAppend(key, value);
    }

    /// <summary>
    /// 获取单个key的值
    /// </summary>
    /// <param name="key">Redis Key</param>
    /// <returns></returns>
    public RedisValue GetStringKey(string key)
    {
        return CacheRedis.StringGet(key);
    }
    /// <summary>
    /// 根据Key获取值
    /// </summary>
    /// <param name="key">键值</param>
    /// <returns>System.String.</returns>
    public string StringGet(string key)
    {
        try
        {
            return CacheRedis.StringGet(key);
        }
        catch (Exception ex)
        {
            Log.LogError("RedisHelper->StringGet 出错\r\n" + ex.ToString());
            return null;
        }
    }

    /// <summary>
    /// 获取多个Key
    /// </summary>
    /// <param name="listKey">Redis Key集合</param>
    /// <returns></returns>
    public RedisValue[] GetStringKey(List<RedisKey> listKey)
    {
        return CacheRedis.StringGet(listKey.ToArray());
    }
    /// <summary>
    /// 批量获取值
    /// </summary>
    public string[] StringGetMany(string[] keyStrs)
    {
        var count = keyStrs.Length;
        var keys = new RedisKey[count];
        var addrs = new string[count];

        for (var i = 0; i < count; i++)
        {
            keys[i] = keyStrs[i];
        }
        try
        {

            var values = CacheRedis.StringGet(keys);
            for (var i = 0; i < values.Length; i++)
            {
                addrs[i] = values[i];
            }
            return addrs;
        }
        catch (Exception ex)
        {
            Log.LogError("RedisHelper->StringGetMany 出错\r\n" + ex.ToString());
            return null;
        }
    }
    /// <summary>
    /// 获取一个key的对象
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="key"></param>
    /// <returns></returns>
    public T GetStringKey<T>(string key)
    {
        return JsonConvert.DeserializeObject<T>(CacheRedis.StringGet(key));
    }

    #endregion

    #region --删除设置过期--
    /// <summary>
    /// 删除单个key
    /// </summary>
    /// <param name="key">redis key</param>
    /// <returns>是否删除成功</returns>
    public bool KeyDelete(string key)
    {
        return CacheRedis.KeyDelete(key);
    }
    /// <summary>
    /// 删除多个key
    /// </summary>
    /// <param name="keys">rediskey</param>
    /// <returns>成功删除的个数</returns>
    public long KeyDelete(RedisKey[] keys)
    {
        return CacheRedis.KeyDelete(keys);
    }
    /// <summary>
    /// 判断key是否存储
    /// </summary>
    /// <param name="key">redis key</param>
    /// <returns></returns>
    public bool KeyExists(string key)
    {
        return CacheRedis.KeyExists(key);
    }
    /// <summary>
    /// 重新命名key
    /// </summary>
    /// <param name="key">就的redis key</param>
    /// <param name="newKey">新的redis key</param>
    /// <returns></returns>
    public bool KeyRename(string key, string newKey)
    {
        return CacheRedis.KeyRename(key, newKey);
    }
    /// <summary>
    /// 删除hasekey
    /// </summary>
    /// <param name="key"></param>
    /// <param name="hashField"></param>
    /// <returns></returns>
    public bool HaseDelete(RedisKey key, RedisValue hashField)
    {
        return CacheRedis.HashDelete(key, hashField);
    }
    /// <summary>
    /// 移除hash中的某值
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="key"></param>
    /// <param name="dataKey"></param>
    /// <returns></returns>
    public bool HashRemove(string key, string dataKey)
    {
        return CacheRedis.HashDelete(key, dataKey);
    }
    /// <summary>
    /// 设置缓存过期
    /// </summary>
    /// <param name="key"></param>
    /// <param name="datetime"></param>
    public void SetExpire(string key, DateTime datetime)
    {
        CacheRedis.KeyExpire(key, datetime);
    }
    #endregion

}

}

复制代码

1. 使用实例
   
   　　在HomeCtroller控制器中添加测试redis方法如下：写；读；删除。

复制代码

public IActionResult Index()

{

#region --测试redis--

RedisHelper.Default.StringSet("redis", "redis" + DateTime.Now, TimeSpan.FromSeconds(1000000));

ViewData["redis"] = RedisHelper.Default.StringGet("redis");

//RedisHelper.Default.KeyDelete("redis");

#endregion

return View();

}

复制代码

5. 总结

　　Redis读写速度快性能高，但部署到生产环境中要注意端口、密码设置，最好是部署在内网环境中，另由于之前都是使用ServiceStack.Redis，由于ServiceStack.Redis v4版本后是收费版的，好像还有每小时6000次访问请求的问题需注意，具体这俩请自行搜索对比。Redis 有五种常用数据类型，字符串类型（string），散列类型（hash），列表类型（list），集合类型（set），有序集合类型（zset）参考：https://www.cnblogs.com/mingtianct/p/6291593.html；这里我暂只处理了string类型，上面我测试的方法有限，其他类型各位可自行补充，网上有很多案例。