Question

What’s a more elegant way of having the code below where i want to return a derived class based on the type of another class.

            if (option_ is Rectangle)             {                 modelInputs = new Foo();             }             else if (option_ is Circle)             {                 modelInputs = new Bar();             }             else if (option_ is Triangle)             {                 modelInputs = new Bar2();             } 

Answer 1

Have Rectangle, Circle and Triangle implement IHasModelInput:

interface IHasModelInput {     IModelInput GetModelInput(); } 

then you can do

IModelInput modelInputs = option_.GetModelInput();