AutoMapper在源属性的情况下将目标设置为null [英] AutoMapper set destination to null on condition of source property

问题描述

我正在两个对象之间进行映射，并且根据源的条件，我希望目标为空.

I'm mapping between two objects and based on a condition of the source I would like the destination to be null.

例如，以下是这些类:

public class Foo
{
    public int Code { get; set; }
    public string Name { get; set; }

}

public class Bar
{
    public string Name { get; set; }
    public string Type { get; set; }
}

我的地图:

Mapper.CreateMap<Foo, Bar>()
            .AfterMap((s, d) => { if (s.Code != 0) d = null; });

但是它似乎忽略了AfterMap.尽管具有所有默认属性，但Bar已初始化.

But it seems to ignore the AfterMap. Bar is initialised although with all default properties.

如何基于不等于0的Code来使映射器返回null?

How can I get the mapper to return null based on Code not being equal to 0?

谢谢

推荐答案

一种可能的方法是-

class Converter : TypeConverter<Foo, Bar>
{
    protected override Bar ConvertCore(Foo source)
    {
        if (source.Code != 0)
            return null;
        return new Bar();
    }
}


static void Main(string[] args)
    {
        Mapper.CreateMap<Foo, Bar>()
            .ConvertUsing<Converter>();


        var bar = Mapper.Map<Bar>(new Foo
        {
            Code = 1
        });
        //bar == null true
    }

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