C# 使用自定义映射自动映射展平多个复杂对象
因此,除了通常的DTO到业务映射器之外,我还有一些东西,我正在尝试用最少的映射代码来映射它们 设置C# 使用自定义映射自动映射展平多个复杂对象,c#,automapper,emitmapper,C#,Automapper,Emitmapper,因此,除了通常的DTO到业务映射器之外,我还有一些东西,我正在尝试用最少的映射代码来映射它们 设置 public class Target { public string propA { get; set; } public string propB { get; set; } public string propC { get; set; } public string propD { get; set; } public string propE {
public class Target {
public string propA { get; set; }
public string propB { get; set; }
public string propC { get; set; }
public string propD { get; set; }
public string propE { get; set; }
public List<KeyValuePair> Tokens { get; set; }
}
public class Source {
public SomeClass SomeClass { get; set; }
public AnotherClass AnotherClass { get; set; }
}
public class SomeClass {
public string propA { get; set; }
public string propB { get; set; }
public string propDifferent { get; set; }
public List<KeyValuePair> Tokens { get; set; }
}
public class AnotherClass {
public string propC { get; set; }
public string propD { get; set; }
public List<KeyValuePair> Tokens { get; set; }
}
注意:我使用Name.ToLowerInvariant()
来匹配AccountID
->AccountID
和类似内容
用法
AutoMapper.Mapper.CreateMap<Source, Target>()
.FlattenNested<Source, SomeClass, Target>()
.FlattenNested<Source, AnotherClass, Target>()
.ForMember(dest => dest.propE, opt => opt.MapFrom(src => src.propDifferent));
public class Customer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public Address Address { get; set; }
}
public class Address
{
public string City { get; set; }
public string Street { get; set; }
}
public class CustomerDto
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string City { get; set; }
public string Street { get; set; }
}
public class CustomerProfile : Profile
{
protected override void Configure()
{
var nestedMap = CreateMap<Address, CustomerDto>()
.IgnoreAllNonExisting();
CreateMap<Customer, CustomerDto>()
.FlattenNested(s => s.Address, nestedMap);
}
}
[TestFixture]
public class CustomerProfileTests
{
[Test]
public void Test()
{
Mapper.Initialize(c => c.AddProfile<CustomerProfile>());
Mapper.AssertConfigurationIsValid();
}
}
AutoMapper.Mapper.CreateMap()
.ForMember(dest=>dest.propE,opt=>opt.MapFrom(src=>src.propDifferent));
我在
IMappingExpression
中发现了一些其他属性,我可能能够大量使用和清理这些属性。将在我找到它们时更新。要使用BeforeMap实例化对象:
更新:
Mapper.CreateMap<Source, Target>()
.BeforeMap(( Source, Target) => {
Source.SomeClass = new SomeClass();
Source.AnotherClass = new AnotherClass();
})
.AfterMap(( Source, Target) => {
Target.SomeClass = Mapper.Map<AnotherClass, Target>(Target);
Target.AnotherClass = Mapper.Map<SomeClass, Target>(Target);
})
Mapper.CreateMap()
.BeforeMap((源、目标)=>{
Source.SomeClass=新的SomeClass();
Source.AnotherClass=新的AnotherClass();
})
.AfterMap((源、目标)=>{
Target.SomeClass=Mapper.Map(Target);
Target.AnotherClass=Mapper.Map(目标);
})
这将允许您在映射单个对象属性之前映射父对象
我想我在你的基类名称中迷失了方向,但是你可以调用mapper.Map属性来映射对象
更新2:
基于此代码:
Mapper.CreateMap<Source, Target>()
.ForMember(dest => **dest**, opt => opt.MapFrom(src => src.SomeClass))
.ForMember(dest => **dest**, opt => opt.MapFrom(src => src.AnotherClass));
Mapper.CreateMap()
.ForMember(dest=>**dest**,opt=>opt.MapFrom(src=>src.SomeClass))
.ForMember(dest=>**dest**,opt=>opt.MapFrom(src=>src.AnotherClass));
Dest正在尝试解析一个对象。如果您只想解析这些对象上的属性,那么我建议您指定它们
Mapper.CreateMap<Source, Target>()
.ForMember(dest => dest.propA, opt => opt.MapFrom(src => src.SomeClass.propA
.ForMember(dest => dest.propB, opt => opt.MapFrom(src => src.SomeClass.propB
.ForMember(dest => dest.propC, opt => opt.MapFrom(src => src.AnotherClass.propC
.ForMember(dest => dest.propD, opt => opt.MapFrom(src => src.AnotherClass.propD
Mapper.CreateMap()
.FormMember(dest=>dest.propA,opt=>opt.MapFrom(src=>src.SomeClass.propA
.FormMember(dest=>dest.propB,opt=>opt.MapFrom(src=>src.SomeClass.propB
.FormMember(dest=>dest.propC,opt=>opt.MapFrom(src=>src.AnotherClass.propC
.ForMember(dest=>dest.propD,opt=>opt.MapFrom(src=>src.AnotherClass.propD
这就是我解决类似问题的方法:
public static IMappingExpression<TSource, TDestination> FlattenNested<TSource, TNestedSource, TDestination>(
this IMappingExpression<TSource, TDestination> expression,
Expression<Func<TSource, TNestedSource>> nestedSelector,
IMappingExpression<TNestedSource, TDestination> nestedMappingExpression)
{
var dstProperties = typeof(TDestination).GetProperties().Select(p => p.Name);
var flattenedMappings = nestedMappingExpression.TypeMap.GetPropertyMaps()
.Where(pm => pm.IsMapped() && !pm.IsIgnored())
.ToDictionary(pm => pm.DestinationProperty.Name,
pm => Expression.Lambda(
Expression.MakeMemberAccess(nestedSelector.Body, pm.SourceMember),
nestedSelector.Parameters[0]));
foreach (var property in dstProperties)
{
if (!flattenedMappings.ContainsKey(property))
continue;
expression.ForMember(property, opt => opt.MapFrom((dynamic)flattenedMappings[property]));
}
return expression;
}
publicstaticimappingexpression(
这个IMappingExpression表达式,
表达式嵌套选择器,
IMappingExpression嵌套的映射表达式)
{
var dstProperties=typeof(tdestinition).GetProperties().Select(p=>p.Name);
var flattedMappings=nestedMappingExpression.TypeMap.GetPropertyMaps()
.Where(pm=>pm.IsMapped()&&!pm.IsIgnored())
.ToDictionary(pm=>pm.DestinationProperty.Name,
pm=>Expression.Lambda(
表达式.MakeMemberAccess(nestedSelector.Body,pm.SourceMember),
nestedSelector.Parameters[0]);
foreach(dstProperties中的var属性)
{
如果(!FlattedMappings.ContainsKey(属性))
继续;
expression.ForMember(属性,opt=>opt.MapFrom((动态)flattedMappings[property]);
}
返回表达式;
}
用法
AutoMapper.Mapper.CreateMap<Source, Target>()
.FlattenNested<Source, SomeClass, Target>()
.FlattenNested<Source, AnotherClass, Target>()
.ForMember(dest => dest.propE, opt => opt.MapFrom(src => src.propDifferent));
public class Customer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public Address Address { get; set; }
}
public class Address
{
public string City { get; set; }
public string Street { get; set; }
}
public class CustomerDto
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string City { get; set; }
public string Street { get; set; }
}
public class CustomerProfile : Profile
{
protected override void Configure()
{
var nestedMap = CreateMap<Address, CustomerDto>()
.IgnoreAllNonExisting();
CreateMap<Customer, CustomerDto>()
.FlattenNested(s => s.Address, nestedMap);
}
}
[TestFixture]
public class CustomerProfileTests
{
[Test]
public void Test()
{
Mapper.Initialize(c => c.AddProfile<CustomerProfile>());
Mapper.AssertConfigurationIsValid();
}
}
公共类客户
{
公共字符串名{get;set;}
公共字符串LastName{get;set;}
公共广播地址{get;set;}
}
公共课堂演讲
{
公共字符串City{get;set;}
公共字符串Street{get;set;}
}
公共类CustomerDto
{
公共字符串名{get;set;}
公共字符串LastName{get;set;}
公共字符串City{get;set;}
公共字符串Street{get;set;}
}
公共类CustomerProfile:配置文件
{
受保护的覆盖无效配置()
{
var nestedMap=CreateMap
虽然它不是通用的解决方案,但对于简单的情况应该足够了
优点是:
您可以使用AutoMapper创建嵌套映射,这样您就可以依赖受信任的代码,还可以使用RecognizePrefixes
等内容
由于需要指定嵌套特性选择器,因此当具有多个相同类型的嵌套特性时,可以避免可能出现的歧义
你确定吗?我在BeforeMap
Target
中得到了同样的错误,没有SomeClass
或AnotherClass
,只有平面属性。从错误来看,似乎只有非平面顶级属性可以映射为平面属性。谢谢,但这正是我想要避免的。我有硬连线的个人pr属性手动现在,但我想利用“自动映射”!:)谢谢。虽然我现在正试图摆脱自动映射。