自动映射器：检索DTO映射

Question

Assuming I have registered DTO's (which implement IBaseDto) to map to entities (which implement IUpdateEntity)

Now when I have a generic TEntity (currentItem), I want to find the correct DTO type it is mapped to. I have the following code:

  var mappings = Mapper.GetAllTypeMaps();
  var typeMap = mappings.FirstOrDefault(m => m.DestinationType == typeof (TEntity) &&   m.SourceType == typeof(BaseDto));
  if (typeMap != null)
  {
     var sourceType = typeMap.SourceType;

     var dto = currentItem.Map().To<sourceType>(); //map the entity to it's DTO
     var request = new SaveServiceRequest<sourceType> { Entity = currentItem }; // create a SaveServiceRequest
     SaveItem(request); //save the DTO
  }

Now the problem I'm having is on the line where I try to map the currentItem to a DTO. VS/Resharper says It cannot resolve the symbol "sourceType". What am I missing here?

Answer 1

You cannot pass generic type parameters as runtime arguments they need to be set at compile time. Your code does not set the type parameter to the value in the sourceType variable, it is telling the compiler that the type is called sourceType so you are getting a compilation error as you have not defined a type called sourceType.