How to sum generic numbers in C#? [duplicate]

Answer 1

You can specify a constraint for T that it must be a struct, and perhaps that it implements IConvertable, and then use Convert.

public class NumberContainer
        where T : struct, IConvertible
    {
        public T ValueA { get; private set; }
        public T ValueB { get; private set; }
        public T Total {
            get
            {
                // do type checking here, then:

                return (T)Convert.ChangeType(
                    Convert.ToDouble((object)ValueA) +
                    Convert.ToDouble((object)ValueB), typeof(T));
            } 
        }
    }

However, there's no way with generics to guarantee that T is an integer or floating type at compile time. You can check it at runtime, though, and throw an exception.