csredis-in-asp. Net core theory practice - use examples

Premise

• Install and configure redis service , You can use .
• vs2017 or vs2019 or vscode
• .net core 2.2+ sdk

Create a . NET Core WebAPI project

Want to execute . NET Core CLI Command line , want cd To csproj In the same level directory

dotnet add package CSRedisCore
#mvc Distributed cache injection 
dotnet add package Caching.CSRedis

or
Package management console (Package Manager) Run in , Choose your project

Install-Package CSRedisCore
Install-Package Caching.CSRedis

Common mode

1. appsettings.json Configuration item

{
    
  "CsRedisConfig": {
    
    "DefaultConnectString": "127.0.0.1:6379,password=,defaultDatabase=0,prefix=csredis-default-"
  }
}

2. Startup.cs The configuration in is as follows

public void ConfigureServices(IServiceCollection services)
{
    
    // eg 1. Single redis Realization   Common mode 
    //CSRedisClient csredis = new CSRedisClient("127.0.0.1:6379,password=,defaultDatabase=csredis,prefix=csredis-example");
   //eg 2. Single redis, Use appsettings.json Configuration items in 
    IConfigurationSection configurationSection = Configuration.GetSection("CsRedisConfig:DefaultConnectString");
    CSRedisClient csredis = new CSRedisClient(configurationSection.Value);

    // initialization  RedisHelper
    RedisHelper.Initialization(csredis);
    // register mvc Distributed cache 
    services.AddSingleton<IDistributedCache>(new CSRedisCache(RedisHelper.Instance));

    ... Other code 
   
}

3. ValuesController.cs

Through static method calls , The key is test1 ,value The value passed from the foreground , cache 60s

Get value Get Method , test1 As key , Return the value to the foreground .60s Get it later , Will not get the value .

// POST api/values
[HttpPost]
public void Post([FromBody] string value)
{
    
    RedisHelper.Set("test1", value, 60);
}

// GET api/values
[HttpGet]
public ActionResult<string> Get()
{
    
    return RedisHelper.Get("test1");
}

Common mode - Console

   class Program
    {
    
        static void Main(string[] args)
        {
    
            var csredis = new CSRedis.CSRedisClient("127.0.0.1:6379,password=,defaultDatabase=CsRedis,prefix=CsRedis_ConSole_Example");
            RedisHelper.Initialization(csredis);

            RedisHelper.Set("test1", "123123", 60);
            string result = RedisHelper.Get("test1");
            Console.WriteLine("key:test1,value:" + result);

            Console.ReadKey();
        }
    }

Sentinel mode

Premise

• Understand the role of sentinel mode
• And there is an available master （master）redis service , Two slave （slaver） service , There are three sentinels monitoring .

1. appsettings.json Configuration item

{
    
  "CsRedisConfig": {
    
    "SentinelConnectString": "mymaster,password=,prefix=csredis-example-",
    "Sentinel": [
      "127.0.0.1:26379",
      "127.0.0.1:26380",
      "127.0.0.1:26381"
    ]
  }
}

2. Startup.cs The configuration in is as follows

public void ConfigureServices(IServiceCollection services)
{
    
    //eg.3  Use appsettings.json, Sentinel mode 
    IConfigurationSection configurationSection = Configuration.GetSection("CsRedisConfig:SentinelConnectString");

    string[] sentinelValues = Configuration.GetSection("CsRedisConfig:Sentinel").Get<string[]>();

    CSRedisClient csredis = new CSRedisClient(configurationSection.Value, sentinelValues);

    // initialization  RedisHelper
    RedisHelper.Initialization(csredis);
    // register mvc Distributed cache 
    services.AddSingleton<IDistributedCache>(new CSRedisCache(RedisHelper.Instance));

    ... Other code 
}

3. Using cache is the same as normal mode , But close one redis service , The service is still available , But if redis In switch cluster The process , There will be short-lived failures , But it will recover soon .

RedisHelper And redis-cli The command line is consistent api, Will use redis Relevant command , You can use RedisHelper Method

coordination redis-cli Command line

  static void Main()
    {
    
        CSRedisClient csredis = new CSRedisClient("127.0.0.1:6379,password=,defaultDatabase=CsRedis,prefix=CsRedis_ConSole_Example");
        RedisHelper.Initialization(csredis);
    
        Test();
        Console.ReadKey();
    }

    static void Test()
    {
    
     //1.set key value [ex seconds] [px milliseconds] [nx|xx]
    //setex key seconds value # Set the value of the key , And specify the... Corresponding to this key value   Valid time .
    //setnx key value # The key must be   non-existent , Can be set successfully . If the key already exists , return  0.
    RedisHelper.Set("redis-key", "just a string value", 50);//setex "redis-key" 50 "just a string value"

    RedisHelper.Set("redis-key-class",DateTime.Now, 30);

    //1.1.2.  Get value 
    //get key
    // If you want to get   The key doesn't exist , Then return to  nil（ empty ）.
    string redisValue = RedisHelper.Get("redis-key");
    Console.WriteLine($"setex redis-key 50 just a string value ,RedisHelper.Get() The results are as follows ：{
      redisValue}");
    DateTime now = RedisHelper.Get<DateTime>("redis-key-class");
    Console.WriteLine($"setex redis-key-class DateTime.Now,RedisHelper.Get() Values are as follows {
      now}");

    //1.1.3.  Batch setting value 
    //mset key value [key value ...]
    RedisHelper.MSet("a", "1", "b", "2", "c", "3","d","4");// Equivalent to mset a 1 b 2 c 3 d 4

    //1.1.4.  Batch fetch value 
    //mget key [key ...]

    string[] mgetValues = RedisHelper.MGet<string>("a", "b", "c","d");
    Console.WriteLine($"mset a 1 b 2 c 3 d 4, RedisHelper.MGet() The value is ");
    foreach (var mgetValue in mgetValues)
    {
    
        Console.Write($"{
      mgetValue}、");
    }
    Console.WriteLine();

    //1.1.5.  Count 
    //incr key
    //incr  The command is used to do   Self increment operation 

    // Increment the specified number 
    long incr = RedisHelper.IncrBy("key");
    Console.WriteLine($"incr key, incr The value is {
      incr}");
    // Set the increment value of the self incrementing number 
    incr = RedisHelper.IncrBy("key",2);
    Console.WriteLine($" Again incrby key 2, incr The value is {
      incr}");

    incr = RedisHelper.IncrBy("key", -2);
    Console.WriteLine($" Again decrby key -2, incr The value is {
      incr}");

    //exists key
    bool isExistsKey = RedisHelper.Exists("new-key");
    Console.WriteLine($"exists key ,value：{
      isExistsKey}");

    double incrByFloat=RedisHelper.IncrByFloat("key-float", 0.1);
    Console.WriteLine($"incrbyfloat key-float 0.1,value：{
      incrByFloat}");
    }