How to use PreCondition with ProjectTo

[cuongdo926]

I have a PostDto class that has some count properties such as CommentCount, and AnswerCount...
How can I use ProjectTo with PreCondition or is there any way to do it with AutoMapper?

// query
PostSet.AsNoTracking().ProjectTo<PostDto>({ postType : 'Post' })
PostSet.AsNoTracking().ProjectTo<PostDto>({ postType : 'Question' })

// map configuration
string postType = null;
configuration.CreateMap<Post, PostDto>()
    .ForMember(x => x.AnswerCount, opt =>
    {
        opt.PreCondition((Post _) => postType == 'Post);
        opt.MapFrom(x => x.Answers.Count());
    })
    .ForMember(x => x.CommentCount, opt =>
    {
        opt.PreCondition((Post _) => postType == 'Question');
        opt.MapFrom(x => x.Comments.Count());
    })
    ;

Below are 2 worked solutions but I wonder if there is any way to use with AutoMapper:

• Add different DTO classes with exact properties used for ProjectTo
• Project with same DTO class using Select but the code is messy with many manual map and many conditions to get proper Select

[lbargaoanu]

https://docs.automapper.org/en/latest/Queryable-Extensions.html#supported-mapping-options