Question

我有一个看起来像这样的StudentClassViewModel：

    public int StudentId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string SchoolName { get; set; }

    public int ClassId { get; set; }
    public string ClassName{ get; set; }
    public string ClassSubject { get; set; }

前4个属性来自学生表，后3个来自CLass表。我正在使用AutoMapper进行映射，我希望了解如何从ViewModel映射到两个表，理论是VM将数据从View返回到Controller，我想将其从VM映射到2个单独的保存表。

我认为它应该在'CreateMap'配置中，例如：

        Mapper.CreateMap<StudentClassViewModel, Student>()
            .ForMember(x => x.ClassId, y => y.Some how map to the Class table)
            .ForMember(x => x.ClassName, y => y.Some how map to the Class table)
            .ForMember(x => x.ClassSubject, y => y.Some how map to the Class table));

我也完全错过了自动映射的意义，无论哪种方式，请告诉我。

Answer 1

如果您可以控制目标对象，那么可以将Class属性添加到Student类，让AutoMapper为您处理映射：

public class StudentClassViewModel
{
    public int StudentId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string SchoolName { get; set; }

    public int ClassId { get; set; }
    public string ClassName { get; set; }
    public string ClassSubject { get; set; }
}

public class Class
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Subject { get; set; }
}

public class Student
{
    public int StudentId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string SchoolName { get; set; }

    public Class Class { get; set; }
}

Mapper.CreateMap<StudentClassViewModel, Student>();

var student = AutoMapper.Mapper.Map<StudentClassViewModel>(viewModel);

Answer 2

如果这两个表完全分开，则没有简单的方法。但是，如果学生和班级之间存在关系，就像学生参加班级一样：

public class Class
{
    public long Id {get; set;}
    public string Name {get; set;}
    public string Subject {get; set;}
}

public class Student
{
    public string FullName {get; set;}
    public Class Class {get; set;}
}

您可以映射如下：

Mapper.CreateMap<StudentClassViewModel, Student>()
    .ForMember(x => x.ClassId, y => y.Student.Class.Id)
    .ForMember(x => x.ClassName, y => y.Student.Class.Name)
    .ForMember(x => x.ClassSubject, y => y.Student.Class.Subject));

自动映射 - 将多个表映射到一个ViewModel

2 个答案: