MediatR Dependency Injection 的升级步骤是什么

Question

我参加了使用 MediatR DI 1.0.1 的 Jimmy 的课程。我正在尝试将基于该课程示例的项目升级到 2.0.0，但找不到任何升级步骤。

这是课程中的一个具体示例。我已将 IAsyncRequest 更改为 IRequest，这似乎是正确的。剩余的错误是：

public class EmployeeEditHandler : AsyncRequestHandler<EmployeeEditModel>

和

protected override async Task HandleCore(EmployeeEditModel message)

AsyncRequestHandler应该改成什么？ HandleCore 是否需要更改？

namespace EmployeeDirectory.ViewModels
{
    using MediatR;
    //Other using statements removed for this example

    public class EmployeeEditQuery : IAsyncRequest<EmployeeEditModel>
    {
        public Guid Id { get; set; }
    }

    public class EmployeeEditModel : IAsyncRequest
    {
        public Guid Id { get; set; }
        public string Name { get; set; }
    }

    public class EmployeeEditQueryHandler 
        : IAsyncRequestHandler<EmployeeEditQuery, EmployeeEditModel>
    {
        private readonly DirectoryContext _dbContext;

        public EmployeeEditQueryHandler(DirectoryContext dbContext)
        {
            _dbContext = dbContext;
        }
        public async Task<EmployeeEditModel> Handle(EmployeeEditQuery message)
        {
            var model = await _dbContext
                .Employees
                .Where(e => e.Id == message.Id)
                .ProjectTo<EmployeeEditModel>()
                .SingleOrDefaultAsync();

            return model;
        }
    }

    public class EmployeeEditHandler : AsyncRequestHandler<EmployeeEditModel>
    {
        private readonly DirectoryContext _dbContext;

        public EmployeeEditHandler(DirectoryContext dbContext)
        {
            _dbContext = dbContext;
        }

        protected override async Task HandleCore(EmployeeEditModel message)
        {
            var employee = await _dbContext.Employees
                .SingleOrDefaultAsync(e => e.Id == message.Id);

            Mapper.Map(message, employee);
        }
    }
}

Answer 1

我发现 Jimmy 使用 MediatR 2.0.0 重写了 Contoso，这给了我答案。以下是我从 1.0.1 到 2.0.0 所做的更改：

更新控制器操作：
来自：await _mediator.SendAsync(query);
至：等待_mediator.Send(查询)；

更新 AsyncRequestHandler：
来自：public class EmployeeEditHandler : AsyncRequestHandler
收件人：public class EmployeeEditHandler : IAsyncRequestHandler

更新 HandleCore：
来自：protected override async Task HandleCore(EmployeeEditModel message)
至：public 异步任务句柄（EmployeeEditModel 消息）

更新 IAsyncRequest：
来自：public class EmployeeEditQuery：IAsyncRequest
收件人：public class EmployeeEditQuery : IRequest

MediatR Dependency Injection 的升级步骤是什么

What are the upgrade steps for MediatR Dependency Injection

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