C# 属性名称不同时如何指定映射规则
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How to specify mapping rule when names of properties differ
提问by Thomas.Benz
I am a newbie to the Automapper framework. I have a domain class and a DTO class as follows:
我是 Automapper 框架的新手。我有一个域类和一个 DTO 类，如下所示：
public class Employee
{
public long Id {get;set;}
public string Name {get;set;}
public string Phone {get;set;}
public string Fax {get;set;}
public DateTime DateOfBirth {get;set;}
}
public class EmployeeDto
{
public long Id {get;set;}
public string FullName {get;set;}
public DateTime DateOfBirth {get;set;}
}
Note: The name of property "Name" of Employeeclass is not the same as that of property "FullName" of EmployeeDtoclass.
注意：类的属性“ Name”的名称与Employee类的属性“ FullName”的名称不同EmployeeDto。
And here's the code to map the Employeeobject to EmployeeDto:
这是将Employee对象映射到的代码EmployeeDto：
Mapper.CreateMap<Employee, EmployeeDto>(); // code line (***)
EmployeeDto dto = Mapper.Map<Employee, EmployeeDto>(employee);
My question is: If I want to map Employee(source class) to EmployeeDto(destination class), how can I specify the mapping rule? In other words, how should I do more with code line (***) above?
我的问题是：如果我想将Employee（源类）映射到EmployeeDto（目标类），我该如何指定映射规则？换句话说，我应该如何对上面的代码行（***）做更多的事情？
采纳答案by Thomas.Benz
Never mind, I myself found a solution:
没关系，我自己找到了一个解决方案：
Mapper.CreateMap<Employee, EmployeeDto>()
.ForMember(dest => dest.FullName, opt => opt.MapFrom(src => src.Name));
回答by ebol2000
Just to roll the comments above into an updated approach using Automapper 8.1+...
只是为了使用 Automapper 8.1+ 将上面的评论滚动到更新的方法中......
var mapConfig = new MapperConfiguration(
cfg => cfg.CreateMap<Employee, EmployeeDto>()
.ForMember(dest => dest.FullName, opt => opt.MapFrom(src => src.Name))
);
Then you would build the mapper using the mapConfig:
然后您将使用 mapConfig 构建映射器：
var mapper = mapConfig.CreateMapper();
回答by Pranay DevOps
We can also specify on Class attributes for mapping
我们还可以指定用于映射的类属性
From https://docs.automapper.org/en/stable/Conventions.html#attribute-support
来自https://docs.automapper.org/en/stable/Conventions.html#attribute-support
Attribute Support
AddMemberConfiguration().AddName<SourceToDestinationNameMapperAttributesMember>();* Currently is always onLooks for instances of SourceToDestinationMapperAttribute for Properties/Fields and calls user defined isMatch function to find member matches.
MapToAttribute is one of them which will match the property based on name provided.
public class Foo { [MapTo("SourceOfBar")] public int Bar { get; set; } }
属性支持
AddMemberConfiguration().AddName<SourceToDestinationNameMapperAttributesMember>();* 当前始终开启查找属性/字段的 SourceToDestinationMapperAttribute 实例，并调用用户定义的 isMatch 函数来查找成员匹配项。
MapToAttribute 是其中之一，它将根据提供的名称匹配属性。
public class Foo { [MapTo("SourceOfBar")] public int Bar { get; set; } }
