AutoMapper实现对象转换的几种方式 _AutoMapper

但使书种多，会有岁稔时。这篇文章主要讲述AutoMapper实现对象转换的几种方式相关的知识，希望能为你提供帮助。

namespace ConsoleApplication1 { class Program { static void Main(string[] args) { //1.普通转换 Name name1 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, NameDto> () .BeforeMap((name, nameDto) => Console.WriteLine("hello world before")) .AfterMap((name, nameDto) => Console.WriteLine("hello world after")); NameDto nameDto1 = Mapper.Map< Name, NameDto> (name1); Console.WriteLine("1"); Console.WriteLine(nameDto1.FirstName + nameDto1.LastName); Console.WriteLine(); //Console.ReadKey(); //整体设置 //2.整体即时转换 Mapper.Reset(); Name name2 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, NameDto> () .ConstructUsing(name => new NameDto() { AllName = name.FirstName + name.LastName }); NameDto nameDto2 = Mapper.Map< Name, NameDto> (name2); Console.WriteLine("2"); Console.WriteLine(nameDto2.AllName); Console.WriteLine(); //Console.ReadKey(); //3.整体通过TypeConverter类型转换 Mapper.Reset(); Name name3 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, NameDto> () .ConvertUsing< NameConverter> (); NameDto nameDto3 = Mapper.Map< Name, NameDto> (name3); Console.WriteLine("3"); Console.WriteLine(nameDto3.AllName); Console.WriteLine(); //Console.ReadKey(); //单属性设置 //4.属性条件转换 Mapper.Reset(); Name name4 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, NameDto> () .ForMember(name => name.FirstName, opt => opt.Condition(name => !name.FirstName.Equals("l", StringComparison.OrdinalIgnoreCase))); NameDto nameDto4 = Mapper.Map< Name, NameDto> (name4); Console.WriteLine("4"); Console.WriteLine(string.IsNullOrEmpty(nameDto4.FirstName)); Console.WriteLine(); //Console.ReadKey(); //5.属性忽略 Mapper.Reset(); Name name5 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, NameDto> () .ForMember(name => name.FirstName, opt => opt.Ignore()); NameDto nameDto5 = Mapper.Map< Name, NameDto> (name5); Console.WriteLine("5"); Console.WriteLine(string.IsNullOrEmpty(nameDto5.FirstName)); Console.WriteLine(); //Console.ReadKey(); //6.属性转换 Mapper.Reset(); Name name6 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, NameDto> () .ForMember(name => name.AllName, opt => opt.MapFrom(name => name.FirstName + name.LastName)); NameDto nameDto6 = Mapper.Map< Name, NameDto> (name6); Console.WriteLine("6"); Console.WriteLine(nameDto6.AllName); Console.WriteLine(); //Console.ReadKey(); //7.属性通过ValueResolver转换 Mapper.Reset(); Name name7 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, StoreDto> () .ForMember(storeDto => storeDto.Name, opt => opt.ResolveUsing< NameResolver> ()); StoreDto store1 = Mapper.Map< Name, StoreDto> (name7); Console.WriteLine("7"); Console.WriteLine(store1.Name.FirstName + store1.Name.LastName); Console.WriteLine(); //Console.ReadKey(); //8.属性填充固定值 Mapper.Reset(); Name name8 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, NameDto> () .ForMember(name => name.AllName, opt => opt.UseValue< string> ("ljzforever")); NameDto nameDto8 = Mapper.Map< Name, NameDto> (name8); Console.WriteLine("8"); Console.WriteLine(nameDto8.AllName); Console.WriteLine(); //Console.ReadKey(); //9.属性格式化 Mapper.Reset(); Name name9 = new Name() { FirstName = "L", LastName = "jz" }; Mapper.CreateMap< Name, NameDto> () .ForMember(name => name.FirstName, opt => opt.AddFormatter< StringFormatter> ()); NameDto nameDto9 = Mapper.Map< Name, NameDto> (name9); Console.WriteLine("9"); Console.WriteLine(nameDto9.FirstName); Console.WriteLine(); //Console.ReadKey(); //10.属性null时的默认值 Mapper.Reset(); Name name10 = new Name() { FirstName = "L" }; Mapper.CreateMap< Name, NameDto> () .ForMember(name => name.LastName, opt => opt.NullSubstitute("jz")); NameDto nameDto10 = Mapper.Map< Name, NameDto> (name10); Console.WriteLine("10"); Console.WriteLine(nameDto10.LastName); Console.WriteLine(); //Console.ReadKey(); //其它设置与特性 //11.转换匿名对象 Mapper.Reset(); object name11 = new { FirstName = "L", LastName = "jz" }; NameDto nameDto11 = Mapper.DynamicMap< NameDto> (name11); Console.WriteLine("11"); Console.WriteLine(nameDto11.FirstName + nameDto11.LastName); Console.WriteLine(); //Console.ReadKey(); //12.转换DataTable Mapper.Reset(); DataTable dt = new DataTable(); dt.Columns.Add("FirstName", typeof(string)); dt.Columns.Add("LastName", typeof(string)); dt.Rows.Add("L", "jz"); List< NameDto> nameDto12 = Mapper.DynamicMap< IDataReader, List< NameDto> > (dt.CreateDataReader()); Console.WriteLine("12"); Console.WriteLine(nameDto12[0].FirstName + nameDto12[0].LastName); Console.WriteLine(); //Console.ReadKey(); //emitMapper error //List< NameDto> nameDto20 = EmitMapper.ObjectMapperManager.DefaultInstance.GetMapper< IDataReader, List< NameDto> > ().Map(dt.CreateDataReader()); //13.转化存在的对象 Mapper.Reset(); Mapper.CreateMap< Name, NameDto> () .ForMember(name => name.LastName, opt => opt.Ignore()); Name name13 = new Name() { FirstName = "L" }; NameDto nameDto13 = new NameDto() { LastName = "jz" }; Mapper.Map< Name, NameDto> (name13, nameDto13); //nameDto13 = Mapper.Map< Name, NameDto> (name13); //注意,必需使用上面的写法,不然nameDto13对象的LastName属性会被覆盖 Console.WriteLine("13"); Console.WriteLine(nameDto13.FirstName + nameDto13.LastName); Console.WriteLine(); //Console.ReadKey(); //14.Flatten特性 Mapper.Reset(); Mapper.CreateMap< Store, FlattenName> (); Store store2 = new Store() { Name = new Name() { FirstName = "L", LastName = "jz" } }; FlattenName nameDto14 = Mapper.Map< Store, FlattenName> (store2); Console.WriteLine("14"); Console.WriteLine(nameDto14.NameFirstname + nameDto14.NameLastName); Console.WriteLine(); //Console.ReadKey(); //15.将Dictionary转化为对象,现在还不支持 Mapper.Reset(); Mapper.CreateMap< Dictionary< string, object> , Name> (); Dictionary< string, object> dict = new Dictionary< string, object> (); dict.Add("FirstName", "L"); //Name name15 = Mapper.DynamicMap< Dictionary< string, object> , Name> (dict); Name name15 = Mapper.Map< Dictionary< string, object> , Name> (dict); Console.WriteLine("15"); Console.WriteLine(name15.FirstName); Console.WriteLine(); Console.ReadKey(); } }public class Store { public Name Name { get; set; } public int Age { get; set; } }public class Name { public string FirstName { get; set; } public string LastName { get; set; } }public class StoreDto { public NameDto Name { get; set; } public int Age { get; set; } }public class NameDto { public string FirstName { get; set; } public string LastName { get; set; } public string AllName { get; set; } }public class FlattenName { public string NameFirstname { get; set; } public string NameLastName { get; set; } }public class NameConverter : TypeConverter< Name, NameDto> { protected override NameDto ConvertCore(Name source) { return new NameDto() { AllName = source.FirstName + source.LastName }; } }public class NameResolver : ValueResolver< Name, NameDto> { protected override NameDto ResolveCore(Name source) { return new NameDto() { FirstName = source.FirstName, LastName = source.LastName }; } }public class NameFormatter : ValueFormatter< NameDto> { protected override string FormatValueCore(NameDto name) { return name.FirstName + name.LastName; } }public class StringFormatter : ValueFormatter< string> { protected override string FormatValueCore(string name) { return name + "-"; } } }

【AutoMapper实现对象转换的几种方式】