AutoMapper自定义映射 [英] AutoMapper Custom Mappings

问题描述

假设我有以下课程

public class foo
{
    public string Value;
}


public class bar
{
    public string Value1;
    public string Value2;
}

现在，我想配置自动映射，如果Value1以"A"开头，则将Value1映射到Value，否则，我想将Value2映射到Value.

Now I want to configure Auto Map, to Map Value1 to Value if Value1 starts with "A", but otherwise I want to map Value2 to Value.

这是我到目前为止所拥有的:

This is what I have so far:

Mapper
    .CreateMap<foo,bar>()
    .ForMember(t => t.Value, 
        o => 
            {
                o.Condition(s => 
                    s.Value1.StartsWith("A"));
                o.MapFrom(s => s.Value1);
                  <<***I want to throw Exception here***>>
            })

但是我知道如何有条件地赋予值1或值2，但不知道如何放置一些自定义代码，调用函数或引发异常

However I know how can I give value 1 or value 2 on Conditional basis but don't know how to put some custom code , call a function or throw an Exception

请指导.

推荐答案

您可以将lambda传递给 ResolveUsing :

You can pass a lambda to ResolveUsing:

.ForMember(f => f.Value, o => o.ResolveUsing(b =>
    {
        if (b.Value1.StartsWith("A"))
        {
            return b.Value1;
        }
        return b.Value2;
    }
));

这篇关于AutoMapper自定义映射的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！