[英]Why Automapper not working for base & inherited classes
在MVC应用程序中,有一个从ApplicationUser
基类(ASP.NET Identity)继承的Student类,并且有一个名为StudentViewModel
的ViewModel
,如下所示:
实体类别:
public class ApplicationUser : IdentityUser<int, ApplicationUserLogin,
ApplicationUserRole, ApplicationUserClaim>, IUser<int>
{
public string Name { get; set; }
public string Surname { get; set; }
//code omitted for brevity
}
public class Student: ApplicationUser
{
public int? Number { get; set; }
}
ViewModel:
public class StudentViewModel
{
public int Id { get; set; }
public int? Number { get; set; }
//code omitted for brevity
}
我使用以下方法通过在控制器StudentViewModel
映射到ApplicationUser
来更新Student:
[HttpPost]
[ValidateAntiForgeryToken]
public JsonResult Update([Bind(Exclude = null)] StudentViewModel model)
{
//Mapping StudentViewModel to ApplicationUser ::::::::::::::::
var student = (Object)null;
Mapper.Initialize(cfg =>
{
cfg.CreateMap<StudentViewModel, Student>()
.ForMember(dest => dest.Id, opt => opt.Ignore())
.ForAllOtherMembers(opts => opts.Ignore());
});
Mapper.AssertConfigurationIsValid();
student = Mapper.Map<Student>(model);
//::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
//Then I want to pass the mapped property to the UserManager's Update method:
var result = UserManager.Update(student);
//code omitted for brevity
}
使用此方法时,遇到错误:
无法从用法中推断出方法'UserManagerExtensions.Update(UserManager,TUser)'的类型参数。 尝试显式指定类型参数。
有解决的办法吗?
您遇到的错误与AutoMapper
无关。
问题是由于以下行,您的student
变量属于object
类型
var student = (Object)null;
而应该是Student
。
删除上面的行并使用
var student = Mapper.Map<Student>(model);
或将其更改为
Student student = null;
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