Question

我正在尝试使用自定义值解析程序将Assignees列表的映射从Entity类委托给服务类。下面是我进行映射的课程

using AutoMapper;
using WebApi2Book.Common.TypeMapping;
using WebApi2Book.Data.Entities;

namespace WebApi2Book.Web.Api.AutoMappingConfiguration
{
    public class TaskEntityToTaskAutoMapperTypeConfigurator : IAutoMapperTypeConfigurator
    {
        public void Configure()
        {
            Mapper.Initialize(cfg => {
                cfg.CreateMap<Task, Models.Task>()
                  .ForMember(opt => opt.Links, x => x.Ignore())
                  .ForMember(opt => opt.Assignees, 
                  x => x.ResolveUsing<TaskAssigneesResolver1>());
            });
        }
    }
}

Configure（）方法是从IAutoMapperTypeConfigurator接口

实现的

CustomResolver

using System.Collections.Generic;
using System.Linq;
using AutoMapper;
using WebApi2Book.Common.TypeMapping;
using WebApi2Book.Data.Entities;
using WebApi2Book.Web.Common;
using User = WebApi2Book.Web.Api.Models.User;
using Task = WebApi2Book.Data.Entities.Task;

namespace WebApi2Book.Web.Api.AutoMappingConfiguration
{
    public class TaskAssigneesResolver : IValueResolver<Task, List<User>>//Task, List<User>, List<User>>
    {
        public IAutoMapper AutoMapper
        {
            get { return WebContainerManager.Get<IAutoMapper>(); }
        }

       // protected override List<User> ResolveCore(Task source)
       // {
       //     return source.Users.Select(x => AutoMapper.Map<User>(x)).ToList();
       // }

        public List<User> Resolve(Task source)
        {
            return source.Users.Select(x => AutoMapper.Map<User>(x)).ToList();
        }
    }

Models.Task类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WebApi2Book.Web.Api.Models
{
    public class Task
    {
        private List<Link> _links;
        public long? TaskId { get; set; }
        public string Subject { get; set; }
        public DateTime? StartDate { get; set; }
        public DateTime? DueDate { get; set; }
        public DateTime? CreatedDate { get; set; }
        public DateTime? CompletedDate { get; set; }
        public Status Status { get; set; }
        public List<User> Assignees { get; set; }
        public List<Link> Links
        {
            get { return _links ?? (_links = new List<Link>()); }
            set { _links = value; }
        }

        public void AddLink(Link link)
        {
            Links.Add(link);
        }
    }
}

Entities.Task class

using System;
using System.Collections.Generic;

namespace WebApi2Book.Data.Entities
{
    public class Task : IVersionedEntity
    {
        private readonly IList<User> _users = new List<User>();
        public virtual long TaskId { get; set; }
        public virtual string Subject { get; set; }
        public virtual DateTime? StartDate { get; set; }
        public virtual DateTime? DueDate { get; set; }
        public virtual DateTime? CompletedDate { get; set; }
        public virtual Status Status { get; set; }
        public virtual DateTime CreatedDate { get; set; }
        public virtual User CreatedBy { get; set; }

        public virtual IList<User> Users
        {
            get { return _users; }
        }

        public virtual byte[] Version { get; set; }
    }
}

这应该是一个相当简单的映射，它忽略链接，因为它们不存在于源中，并且它将Assignees映射委派给解析器。

错误：

类型＆＃39; TaskAssigneesResolver＆＃39;不能用作类型参数＆＃39; TValueResolver＆＃39;在通用类型或方法'AutoMapper.IMemberConfigurationExpression<TSource,TDestination,TMember>.ResolveUsing<TValueResolver>()'中。

从'TaskAssigneesResolver'到'AutoMapper.IValueResolver<Data.Models.Task, Entities.Task, object>'没有隐式引用转换。

我怀疑我误解了IValueResolver接口。请给我可能的解决方案：

AutoMapper 6.0.2使用自定义值解析程序解析目标成员

0 个答案: