在DoNetCore MVC 中如何使用AutoMapper

刚开始，按照在donet mvc 的方法写了一遍，发现行不通啊，于是百度了一下，找到这么一篇 https://stackoverflow.com/questions/41284349/automapper-error-saying-mapper-not-initialized

动手开干  ，具体流程

1、Nuget 引入包

Install-Package  AutoMapper.Extensions.Microsoft.DependencyInjection

2、创建我们的源数据实体，创建我们的目标实体

   这是我的项目目录信息，其中红框中就是我们的源实体和目标实体

3、注入服务

在Startup.cs 类中 ConfigureServices 方法中最后一行  添加如下代码：

 services.AddAutoMapper();

 // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });

            //services.AddTransient<IAdminBusinessLoginService, AdminBusinessLoginService>();
          

            var redisconn = Configuration.GetSection("RedisConnectionStrings");
            services.AddOptions();
            services.Configure<RedisConnectionStrings>(redisconn);

            var opt = Configuration.GetSection("RedisConnectionStrings");

            //Models.AutoMapperHelper.AutoMapperConfig.RegisterAutoMapper();

            services.AddSingleton<ICache, ICCSReidsiHelper>();

            services.AddAssembly("DSErpService");
            services.AddAssembly("IDSErpService");
            //注入上下文对象
            var sqlConnection = Configuration.GetConnectionString("SchoolConnection");
            services.AddDbContext<Db>(op => op.UseSqlServer(sqlConnection));

            services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
            //前台用户cookie服务
            .AddCookie(UserAuthorizeAttribute.UserAuthenticationScheme, options =>
             {
                 options.LoginPath = "/Login/Index";
                 options.LogoutPath = "/Login/LogOff";
                 options.AccessDeniedPath = new PathString("/Error/Forbidden");//拒绝访问页面
                 options.Cookie.Path = "/";
             });

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
            services.AddAutoMapper();
        }

如图：

4、创建我们的映射对象

这里直接上代码：

public class CategoryProfiles : Profile
    {
        public CategoryProfiles()
        {
            CreateMap<BusinessCategory, CategoryDto>().ReverseMap()
                .ForMember(a => a.Id, b => b.MapFrom(c => c.Id))
                .ForMember(a => a.CategoryName, b => b.MapFrom(c => c.CategoryName))
                .ForMember(a => a.StatusMark, b => b.MapFrom(c => c.StatusMark));
        }
    }

5、实现

[Route("category")]
    public class categoryController : Controller
    {
        /// <summary>
        /// 获取用户缓存信息
        /// </summary>
        private ICache cache;
        /// <summary>
        /// 分类服务管理
        /// </summary>
        private ICategoryService categoryService;
        private readonly IMapper _mapper;
        public categoryController(ICache _cache, ICategoryService _service, IMapper mapper)
        {
            this.cache = _cache;
            this.categoryService = _service;
            this._mapper = mapper;
        }
        

        [HttpGet("get-pagelist")]
        public async Task<JsonResult> GetCategoryPageList(int pageindex, int pagesize)
        {
            return await Task.Run<JsonResult>(() =>
            {
                var totalcount = 0;
                var reslist = this.categoryService.GetCategroryList(null, pageindex, pagesize, out totalcount);
                return Json(new
                {
                    code = 0,
                    msg = "",
                    count = totalcount,
                    data = this._mapper.Map<List<CategoryDto>>(reslist.data)
                });
            });
        }
    }

说明：

this._mapper.Map<List<CategoryDto>>(reslist.data) 我这里是集合映射到集合 ，

this._mapper.Map<T>(T);

this._mapper.Map<List<T>>(listT);