Question

这是简单的层次结构：

abstract class Base
{
    public int Id { get; set; }
}

class Derived : Base
{
    public string Name { get; set; }
}

我需要克隆Derived个实例，但我想跳过Id个值。所以，我正在以这种方式配置mapper：

        Mapper
            .CreateMap<Base, Base>()
            .Include<Derived, Derived>()
            .ForMember(_ => _.Id, expression => expression.Ignore());

        var original = new Derived
        {
            Id = 1,
            Name = "John"
        };

        var clone = Mapper.Map<Derived>(original);

        Console.WriteLine(clone.Id == 0); // writes 'False'

无论是ForMember调用，都会映射Id的值。

此配置：

        Mapper
            .CreateMap<Derived, Derived>()
            .ForMember(_ => _.Id, expression => expression.Ignore());

按预期工作，但这不是一个选项，因为它需要为每个派生类型设置ForMember。

Automapper版本是2.2.1。我做错了什么？

Answer 1

您是否尝试Ignore基类映射上的Id属性？

Mapper
    .CreateMap<Base, Base>()
    .ForMember(_ => _.Id, expression => expression.Ignore())
    .Include<Derived, Derived>()
    .ForMember(_ => _.Id, expression => expression.Ignore());

[...]约定具有更高的优先级，忽略属性基类映射[...]

https://github.com/AutoMapper/AutoMapper/wiki/Mapping-inheritance

映射派生类型实例时忽略属性

1 个答案: