MediatR基础使用：

1.在WebAPI或者Asp.netCore项目中添加MediatR  

   PM=>    Install-Package MediatR.Extensions.Microsoft.DependencyInjection

　　builder.Services.AddMediatR(Assembly.GetExecutingAssembly());

2.声明一个传输对象：实现:INotification

public class SendData:INotification
    {
        public string UserName { get; set; }
        public string Content { get; set; }

        public override string ToString()
        {
            return $"用户名：{UserName}。传输内容:{Content}";
        }
    }

3.在Controller中 构造注入IMediator 并在Action中发布 mediator.Publish(传输对象）

[Route("api/[controller]")]
    [ApiController]
    public class MadiatRController : ControllerBase
    {
        private IMediator mediator;

        public MadiatRController(IMediator mediator)
        {
            this.mediator = mediator;
        }

        [HttpGet("Test")]
        public string GetString()
        {
            mediator.Publish(new SendData() { UserName = "MadiatRController", Content = "GetString()" }); 
            return "OK";
        }
    }

　　4.添加事件处理类    继承 : NotificationHandler<传输对象>

 public class OtherProcess : NotificationHandler
    {
        protected override void Handle(SendData notification)
        {
            Console.WriteLine($"{nameof(OtherProcess) } {notification.ToString()}");
        }
    }


    public class EventProcess : NotificationHandler
    {
        protected override void Handle(SendData notification)
        {
            Console.WriteLine($"{nameof(EventProcess) } {notification.ToString()}");
        }
    }

　　5.调用API接口：

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