c# - AutoMapper，尝试并捕获映射

Question

我已经创建了一个 map ，但是..一些源属性会不时抛出异常(不要问我为什么有人决定让“get”在其为空时抛出异常..但是好吧。 .) 当 AutoMapper 尝试映射属性时，这会导致一些问题，是否有办法 try catch 映射中的异常，如果它进入缓存，则只需为目标属性分配一个默认值？

兄弟， 指数

Answer 1

你考虑过吗

Automapper.Mapper.CreateMap<Source,Dest>().BeforeMap(Action<Source, Dest> beforeMapAction)`

？

来自https://github.com/AutoMapper/AutoMapper/wiki/Before-and-after-map-actions

Occasionally, you might need to perform custom logic before or after a map occurs. These should be a rarity, as it's more obvious to do this work outside of AutoMapper. You can create global before/after map actions:

Mapper.CreateMap<Source, Dest>()
.BeforeMap((src, dest) => src.Value = src.Value + 10)
.AfterMap((src, dest) => dest.Name = "John");

Or you can create before/after map callbacks during mapping:

int i = 10;
Mapper.Map<Source, Dest>(src, opt => {
opt.BeforeMap((src, dest) => src.Value = src.Value + i);
opt.AfterMap((src, dest) => dest.Name = HttpContext.Current.Identity.Name);
});

The latter configuration is helpful when you need contextual information fed into before/after map actions.

首先，您必须将属性添加到忽略列表，然后在 map 之前使用。

AutoMapper.Mapper.CreateMap<Source,Dest>().
ForMember((src => src.PropertyWithException), opt => opt.Ignore()).
BeforeMap((src,dest)=>
{
    try
    {
        dest.PropertyWithException = src.PropertyWithException;
    }
    catch
    {
        dest.PropertyWithException = some_default_value;
    }
});