AutoMapper 8.0构造使用重大更改

Question

I use AutoMapper in my code and I have a generic wrapper that initializes the mapper. The code runs since long without any problems. After upgrading to AutoMapper 8 my custom converters are ignored. The responsible code for setting the converters is the following:

new MapperConfiguration(cfg =>
   cfg.CreateMap(mySource, myTarget).ConstructUsing(myConverter);

This piece of code does not build with AutoMapper 8, because I have to use expressions. There is even an upgrade guid provided, but I cant manage to get it running again.

I just expected to convert it to

new MapperConfiguration(cfg =>
   cfg.CreateMap(mySource, myTarget).ConstructUsing(expr => myConverter);

but the converter is ignored.

Answer 1

I resolved a similar issue by extracting the myConverter method into a separate class that inherits from ITypeConverter:

public class MyConverter : ITypeConverter<MySourceType, MyDestinationType>
{
    public MyDestinationType Convert(MySourceType source, MyDestinationType destination, ResolutionContext context)
    {
        // Conversion logic here
    }
}

You can then replace the mapping config with the following:

cfg.CreateMap(mySource, myTarget).ConvertUsing<MyConverter>();

or

cfg.CreateMap<MySourceType, MyDestinationType>().ConvertUsing<MyConverter>();