Net中RabbitMq.Client7.0通过依赖注入DI来管理RabbitMQ客户端的生命周期

在 RabbitMQ.Client 7.0.0 版本中，

IModel 在 RabbitMQ.Client 7.0.0-alpha2 版本中已经被重命名，现在应该使用 IChannel 替代 IModel，

IChannel 不再提供 CreateBasicProperties 方法。需要直接使用 BasicProperties 类来创建消息属性。

前言

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下面是通过依赖注入（DI）来管理RabbitMQ客户端的生命周期

1. 安装RabbitMQ客户端库

首先，你需要安装RabbitMQ的.NET客户端库。这可以通过NuGet包管理器来完成：

Install-Package RabbitMQ.Client

2. 配置RabbitMQ连接字符串

在你的appsettings.json文件中，添加RabbitMQ的连接配置：

{
  "RabbitMQ": {
    "HostName": "localhost",
    "Port": 5672,
    "UserName": "guest",
    "Password": "guest"
  }
}

3. 创建RabbitMQ服务配置类

创建一个配置类来封装RabbitMQ的连接信息：

public class RabbitMQOptions
{
    public string HostName { get; set; }
    public int Port { get; set; }
    public string UserName { get; set; }
    public string Password { get; set; }
}

4. 注册RabbitMQ服务

在Startup.cs或程序启动时的配置方法中，注册RabbitMQ服务：

// 绑定RabbitMQ配置
builder.Services.Configure<RabbitMQOptions>(builder.Configuration.GetSection("RabbitMQ"));

// 注册RabbitMQ连接工厂
builder.Services.AddSingleton<IRabbitMQConnection, RabbitMQConnection>(sp =>
{
    var options = sp.GetRequiredService<IOptions<RabbitMQOptions>>().Value;
    var factory = new ConnectionFactory() { HostName = options.HostName, Port = options.Port, UserName = options.UserName, Password = options.Password };
    return new RabbitMQConnection(factory);
}); 

// 添加RabbitMQService的服务注册
builder.Services.AddSingleton<RabbitMQService>();

5. 创建RabbitMQ连接和通道工厂

创建一个工厂类来管理RabbitMQ的连接和通道：

    public interface IRabbitMQConnection : IDisposable
    {
        Task<IChannel> CreateChannel();
    }

    public class RabbitMQConnection : IRabbitMQConnection
    {
        private readonly ConnectionFactory _factory;
        private readonly IConnection _connection;
        private bool _isDisposed;

        public RabbitMQConnection(ConnectionFactory factory)
        {
            _factory = factory ?? throw new ArgumentNullException(nameof(factory));
            _connection = factory.CreateConnectionAsync().Result;
        }

        public async Task<IChannel> CreateChannel()
        {
            EnsureNotDisposed();
            return await _connection.CreateChannelAsync();
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (_isDisposed) return;

            if (disposing)
            {
                // Free any other managed objects here.
            }

            // Free any unmanaged objects here.
            _connection.Dispose();

            _isDisposed = true;
        }

        ~RabbitMQConnection()
        {
            Dispose(false);
        }

        private void EnsureNotDisposed()
        {
            if (_isDisposed)
            {
                throw new ObjectDisposedException(nameof(RabbitMQConnection));
            }
        }
    }

6. 使用RabbitMQ服务

在你的服务或消费者中，注入IRabbitMQConnection并使用它来创建模型（channel）：

using RabbitMQ.Client.Events;
using RabbitMQ.Client;
using System.Text.Json;
using System.Text;

public class RabbitMQService
{
    private readonly IRabbitMQConnection _connection;

    public RabbitMQService(IRabbitMQConnection connection)
    {
        _connection = connection ?? throw new ArgumentNullException(nameof(connection));
    }

    public async Task SendAsync(string exchange, string routingKey, object message, bool mandatory = false, CancellationToken cancellationToken = default)
    {

            try
            {
                using var channel = _connection.CreateChannel();
                var mesjson = JsonSerializer.Serialize(message);
                Console.WriteLine("发送消息：" + mesjson);
                var body = Encoding.UTF8.GetBytes(mesjson);
                var properties = new RabbitMQ.Client.BasicProperties
                {
                    Persistent = true // 设置消息持久化
                };
                channel.BasicPublishAsync(exchange, routingKey, false, properties, body, cancellationToken);

            }
            catch (OperationCanceledException ex)
            {
                Console.WriteLine($"Operation was canceled: {ex.Message}");
                //throw; // Re-throw if you want to propagate the cancellation
            }
            catch (Exception ex)
            {
                Console.WriteLine($"An error occurred: {ex.Message}");
                //throw; // Re-throw if you want to propagate the error
            }
    }

    public async Task ReceiveAsync(string queueName, Func<IChannel, byte[], Task> callback, CancellationToken cancellationToken = default)
    {
        var channel = _connection.CreateChannel();
        await channel.QueueDeclareAsync(queue: queueName, durable: true, exclusive: false, autoDelete: false, arguments: null);

        var consumer = new AsyncEventingBasicConsumer(channel);
        consumer.ReceivedAsync += async (model, ea) =>
        {
            var body = ea.Body.ToArray();
            try
            {
                // 直接传递 model 和 body 给 callback，不需要转换
                await callback(channel, body);
            }

            finally
            {
                //await channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
            }
        };
        await channel.BasicConsumeAsync(queue: queueName, autoAck: false, consumer: consumer, cancellationToken: cancellationToken);
        // Prevent the method from returning immediately
        await Task.Delay(-1, cancellationToken);
    }
}

7.生产端和消费端的使用

消费

var app = builder.Build();

var rabbitMQService = app.Services.GetRequiredService<RabbitMQService>();
var cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = cancellationTokenSource.Token;

// 启动消息接收
var receiveTask = rabbitMQService.ReceiveAsync("Test", async (channel, body) =>
{
    // 处理接收到的消息
    //string message = Encoding.UTF8.GetString(body);
    //Console.WriteLine($"收到消息 message: {message}");
    //// 确认消息
    //await channel.BasicAckAsync(deliveryTag: default, multiple: false, cancellationToken);

}, cancellationToken);

生产端