Unity - How to pass null in the constructor parameter for nullable int

问题

I have a class that takes nullable int as parameter.

public class Test
{
    public Test(int? p)
    {
        // ......
    }

    // ......
}

How do I resolve it using unity (passing null as parameter)?

myContainer.RegisterType<Test>(new InjectionConstructor(10));

This works passing 10 as value, but if I pass null, it throws exception.

回答1:

Edited to use generics:

Try to use InjectionParameter instead:

container.RegisterType<Test>(new InjectionConstructor(new InjectionParameter<int?>(null)));

回答2:

Use an InjectionParameter<T> of the correct type, i.e.

container.RegisterType<Test>(new InjectionConstructor(new InjectionParameter<int?>(null)));

This has been tested in visual studio.

来源：https://stackoverflow.com/questions/18570168/unity-how-to-pass-null-in-the-constructor-parameter-for-nullable-int