Question

我参加了使用MediatR DI 1.0.1的Jimmy课程。我尝试将基于该课程示例的项目升级到2.0.0但我无法找到任何升级步骤。

这是课程的一个具体例子。我已将IAsyncRequest更改为IRequest，这似乎是正确的。剩下的错误是：

public class EmployeeEditHandler : AsyncRequestHandler<EmployeeEditModel>

和

protected override async Task HandleCore(EmployeeEditModel message)

AsyncRequestHandler应该更改为什么？ HandleCore需要更改吗？

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。以下是我必须做的从1.0.1到2.0.0的更改：

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

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

更新HandleCore：
From：protected override async Task HandleCore（EmployeeEditModel message）
To：public async Task Handle（EmployeeEditModel message）

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

MediatR依赖注入的升级步骤是什么？

1 个答案: