Question

I want the second calling style should be similar to first calling style. Please see the details in my code. Any help is really appreciated.

Here is the code I am using.

// Calling Style of First Method

            var source = db.ThinkFeeds.Single(tf => tf.ID == 1);
            var target = new MyProduct.UIEntities.ThinkFeed();
            TypeConverter.ConvertBlToUi(source, target);

//Calling Style of Second method. Its really a weird calling style.

        var source = MyProduct.UIEntities.Book.GetBookByID(1);
        var target = new MyProduct.DTOEntities.Book();
        TypeConverter.ConvertUiToDto<MyProduct.UIEntities.Book, MyProduct.DTOEntities.Book, Book>(source, target);

//First Method

    public static void ConvertBlToUi<TBl, TUi>(TBl entitySource, TUi entityTarget)
    {

    }

//Second Method

    public static void ConvertUiToDto<TUi, TDto, TEntity>(TUi uiEntity, TDto dtoEntity)
        where TDto : DTOEntities.MyProductDTO<TEntity, TDto>
        where TEntity : EntityObject
    {

    }

Answer 1

You can’t. Generic Methods, type inference:

The compiler can infer the type parameters based on the method arguments you pass in; it cannot infer the type parameters only from a constraint or return value. Therefore …

The first style you’ve shown is using type inference, but it’s just a convenient shorthand. There are times (as here) where type inference cannot work, and so you have to supply the type parameters explicitly.