自动触发器和开放泛型

Question

我正在尝试使用Automapper的开放泛型，如https://github.com/AutoMapper/AutoMapper/wiki/Open-Generics所述，以执行用户和帐户之间的映射。

public class User
{
    public Guid UserId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime Dob { get; set; }
}
public class Account
{
    public Guid UserId { get; set; }
    public string FirstName { get; set; }
}

我创建了Source和Destination

public class Source<T>
{
    public T Value { get; set; }
}
public class Destination<T>
{
    public T Value { get; set; }
}

我想在AccountService

中执行映射

public class AccountService
{
    private User user1 = new User{FirstName = "James", LastName = "Jones", Dob = DateTime.Today, UserId = new Guid("AC482E99-1739-46FE-98B8-8758833EB0D2")};
    static AccountService()
    {
        Mapper.CreateMap(typeof(Source<>), typeof(Destination<>));
    }
    public T GetAccountFromUser<T>()
    {
        var source = new Source<User>{ Value = user1 };
        var destination = Mapper.Map<Source<User>, Destination<T>>(source);
        return destination.Value;
    }
}

但是我得到了一个异常

缺少类型映射配置或不支持映射。

映射类型:User -> Account opengeneric . console . models .User ->OpenGenerics.Console.Models.Account

目的路径:Destination ' 1.Value.Value

源值:opengeneric . console . models . user

我确认https://github.com/AutoMapper/AutoMapper/wiki/Open-Generics中的方法适用于int和double

编辑这对我来说可能是一个解决方案，虽然有点乱。

    var mappingExists = Mapper.GetAllTypeMaps().FirstOrDefault(m => m.SourceType == typeof (User) && m.DestinationType == typeof (T));
    if (mappingExists == null)
        Mapper.CreateMap<User, T>();

Answer 1

对于封闭泛型，类型参数也需要能够被映射。添加这个:

Mapper.CreateMap<User, Account>();