AutoMapper 覆盖源属性

Question

我有以下代码来更新 Student 实体：

using static AutoMapper.Mapper;
...
public void Update(StudentInputDto dto)
{
   Student student = _studentRepository.GetStudent();
   student = Map<Student>(dto); //student.studentnumer is null here :(
   _studentRepository.Update(student);
}

我的学生实体：

public class Student
{
   public Guid studentid { get; set; }
   public string firstname { get; set; }
   public string lastname { get; set; }
   public int age { get; set; }
   public Guid genderid { get; set; }
   public string studentnumber { get; set; }
}

我的 StudentInputDto:

public class StudentInputDto
{
   public string FirstName { get; set; }
   public string LastName { get; set; }
   public int Age { get; set; }
   public Guid GenderId { get; set; }
}

问题是映射后Student.studentnumber为空

我想配置 AutoMapper，以便在映射后保留 Student.studentnumber。怎么做？任何帮助将不胜感激。

我最初的想法是按以下方式配置 AutoMapper：

Mapper.Initialize(cfg => {
   cfg.CreateMap<StudentInputDto, Student>()
      .ForMember(dest => dest.studentnumber, opt => opt.Ignore());
});

但是那个配置，并没有解决问题。

Answer 1

看看Automapper的方法描述。

TDestination Map<TDestination>(object source);

Execute a mapping from the source object to a new destination object. The source type is inferred from the source object.

student = Map<Student>(dto) 将创建一个新的 Student 对象并分配给 student 变量

要映射两个现有对象，请改用 Mapper.Map(dto, student);

TDestination Map<TSource, TDestination>(TSource source, TDestination destination)

Execute a mapping from the source object to the existing destination object.

AutoMapper 覆盖源属性

AutoMapper overrides source properties

.net

c#

mapping

dto

automapper