AutoMapper的简单使用

1. 第一种方法，推荐！

添加一个功能类

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

namespace AutoMapperTest2
{
    public static class AutoMapperConfig
    {
        public static IMapper Mapper = new Mapper(RegisterMappings());

        public static MapperConfiguration RegisterMappings()
        {
            return new MapperConfiguration(cfg =>
            {
                cfg.CreateMissingTypeMaps = true;
                cfg.AllowNullDestinationValues = false;
                cfg.ForAllPropertyMaps(IsToRepeatedField, (propertyMap, opts) => opts.UseDestinationValue());
                cfg.ForAllPropertyMaps(IsToMapFieldField, (propertyMap, opts) => opts.UseDestinationValue());

                cfg.AddProfile<OutputModels>();
            });

            bool IsToRepeatedField(PropertyMap pm)
            {
                if (pm.DestinationPropertyType.IsConstructedGenericType)
                {
                    var destGenericBase = pm.DestinationPropertyType.GetGenericTypeDefinition();
                    return false;// destGenericBase == typeof(RepeatedField<>);
                }
                return false;
            }

            bool IsToMapFieldField(PropertyMap pm)
            {
                if (pm.DestinationPropertyType.IsConstructedGenericType)
                {
                    var destGenericBase = pm.DestinationPropertyType.GetGenericTypeDefinition();
                    return false;// destGenericBase == typeof(MapField<,>);
                }
                return false;
            }
        }
    }

    public class OutputModels : Profile
    {
        public OutputModels()
        {
        }
    }
}

使用

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

namespace AutoMapperTest2
{
    class Program
    {
        static void Main(string[] args)
        {
            var src = new source() {
                name = "jeff",
                age  = 1,
                strList = new List<string>() { "1", "2", "3"},
                classList = new List<aaa>()
                {
                    new aaa(){a1="a1", a2=1},
                     new aaa(){a1="a2", a2=2},
                      new aaa(){a1="a3", a2=3},
                }
            };
            var tgt = AutoMapperConfig.Mapper.Map<target>(src);
            if (tgt != null)
                Console.WriteLine($"name = {tgt.name}");
        }
    }

    public class source
    {
        public string name { get; set; }
        public int age { get; set; }
        public List<string> strList { get; set; }
        public List<aaa> classList { get; set; }
    }

    public class target
    {
        public string name { get; set; }
        public int age { get; set; }
        public List<string> strList { get; set; }
        public List<aaa> classList { get; set; }


    }

    public class aaa
    {
        public string a1 { get; set; }
        public int a2 { get; set; }
    }
}

2. 第二种方法：

添加功能类

using AutoMapper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace TCG.DataCollection.Webservice
{
    public sealed class Mapper
    {
        private static readonly Mapper instance = new Mapper();
        private Mapper()
        {
            this.Init();
        }

        public void Init()
        {
            AutoMapper.Mapper.Initialize(cfg =>
            {
                departmentMapping(cfg);
                this.employeeMapping(cfg);this.defaultMapping<JobCoder, JobCodeModel>(cfg);
                this.defaultMapping<EmployeeTerminationData, EmployeeTerminationDataModel>(cfg);
                this.vestingMapping(cfg);
                
            });
        }

        public static Dest Map<Src, Dest>(Src src)
        {
            if (instance != null)
                return AutoMapper.Mapper.Map<Src, Dest>(src);
            else
                throw new Exception("Automapper not initialized."); // TODO: 错误信息需集中定义。
        }

        /// <summary>
        /// 提供默认的类型映射，双向映射，依据属性名称
        /// </summary>
        /// <typeparam name="T1"></typeparam>
        /// <typeparam name="T2"></typeparam>
        /// <param name="cfg"></param>
        private void defaultMapping<T1, T2>(IMapperConfigurationExpression cfg)
        {
            cfg.CreateMap<T1, T2>();
            cfg.CreateMap<T2, T1>();
        }

        private void departmentMapping(IMapperConfigurationExpression cfg)
        {
            cfg.CreateMap<Department, DepartmentModel>()
                .ForMember(dest => dest.ParentDepartmentCode, options => options.MapFrom(src =>
                            string.IsNullOrWhiteSpace(src.ParentDepartmentCode) ? src.DepartmentCode : src.ParentDepartmentCode));

            cfg.CreateMap<DepartmentModel, Department>()
                .ForMember(dest => dest.ParentDepartmentCode, options => options.MapFrom(src => src.ParentDepartmentCode));
        }

        private void vestingMapping(IMapperConfigurationExpression cfg)
        {
            cfg.CreateMap<Vesting, VestingModel>()
                
                .ForMember(dest => dest.VestingDate, options => options.ResolveUsing<DateTime>(src => this.convertDate(src.VestingDate).GetValueOrDefault()));
        }

        private void grantMapping(IMapperConfigurationExpression cfg)
        {
            cfg.CreateMap<Grant, GrantModel>()
                .ForMember(dest => dest.GrantDate, options => options.ResolveUsing<DateTime>(src => { return this.convertDate(src.GrantDate).GetValueOrDefault(); }))
                .ForMember(dest => dest.GrantType, options => options.ResolveUsing<string>(src => this.convertGrantType(src.GrantType)))
            
                .ForMember(dest => dest.IsPerformanceBased, options => options.ResolveUsing<bool>(src => string.Equals(src.IsPerformanceBased, "Y", StringComparison.OrdinalIgnoreCase)));
        }

        private void reinstatementMapping(IMapperConfigurationExpression cfg)
        {
            cfg.CreateMap<ReinstatementData, ReinstatementDataModel>()
                .ForMember(dest => dest.ReinstatementDate, options => options.ResolveUsing<DateTime>(src => this.convertDate(src.ReinstatementDate).GetValueOrDefault()))
                .ForMember(dest => dest.Type, options => options.UseValue<ReinstatementType>(ReinstatementType.R));
        }

        private void employeeMapping(IMapperConfigurationExpression cfg)
        {
            cfg.CreateMap<Employee, EmployeeModel>()
               
                .ForMember(dest => dest.SAFEforSubsequentSalse, options => options.ResolveUsing<string>(src => string.Equals(src.SAFEforSubsequentSalse, "Y", StringComparison.OrdinalIgnoreCase) ? "1" : string.Empty));
        }

        private DateTime? convertDate(string date)
        {
            if (string.IsNullOrEmpty(date))
                return null;

            var year = int.Parse(date.Substring(0, 4));
            var month = int.Parse(date.Substring(4, 2));
            var day = int.Parse(date.Substring(6, 2));

            return new DateTime(year, month, day);
        }
    }
}

使用时

var model = Mapper.Map<Employee, EmployeeModel>(data);