What's the easiest way to generate code dynamically in .NET 4.5?

Question

I\'m writing a specific kind of object-mapper. Basically I want to convert from a DataTable that has the fields a, b and c

Answer 1

Sometimes a 3rd party library is the easiest way to do it, AutoMapper will do exactly what you want with just a few lines of code

//This just needs to be run once, maybe in a static constructor somewhere.
Mapper.CreateMap();



//This line does your mapping.
List myBusinessObject = 
    Mapper.Map>(myDataTable.CreateDataReader());

If your source data does not exactly match your business object all you need to do is add some setup info to CreateMap.

class MyBusinessObject
{
    public int Answer;
    public string Question { get; set; }
}

//In some static constructor somewhere, this maps "a" to "Answer" and "b" to "Question".
Mapper.CreateMap()
      .ForMember(dto => dto.Answer, opt => opt.MapFrom(rdr => rdr["a"]))
      .ForMember(dto => dto.Question, opt => opt.MapFrom(rdr => rdr["b"]));