开放泛型

Open Generic

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

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

// Create the mapping
var configuration = new MapperConfiguration(
  cfg => cfg.CreateMap(typeof(Source<>), typeof(Destination<>))
);

不用为封闭泛型定义映射, AutoMapper 会自动将开放泛型映射作用到封闭分型中.

var source = new Source<int> { Value = 10 };
var dest = mapper.Map<Source<int>, Destination<int>>(source);
dest.Value.ShouldEqual(10);

由于 C# 的参数必须是封闭泛型, 因此开放泛型在定义时使用 typeof.

也可以创建开放泛型类型转换:

var configuration = new MapperConfiguration(cfg => {
   cfg.CreateMap(typeof(Source<>), typeof(Destination<>))
     .ConvertUsing(typeof(Converter<>))
});

开放泛型的类型转换支持多泛型参数

var configuration = new MapperConfiguration(cfg => {
   cfg.CreateMap(typeof(Source<>), typeof(Destination<>))
     .ConvertUsing(typeof(Converter<,>))
});