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Asked: 2026-05-25T01:46:46+00:00

In my constructor of a class, I call a virtual member. Whether this should

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In my constructor of a class, I call a virtual member. Whether this should or should not be done is out of scope for my question.

WORKS (can call in my constructor):

 protected void DoSomething();
 protected virtual void DoSomething();

DOES NOT WORK

 protected override void DoSomething();

The DOES NOT WORK part is located in the same library, the derived class has the same visibility, etc. As soon as I override the (virtual or abstract) DoSomething defined in class A in my Class B, I get a MissingMethodException as soon as the method is executed.

Does anyone have an idea why?

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1 Answer

  1. Editorial Team

    After lots of debugging, trying, etc, it seems that a class I used inside the method derived from an interface with this definition:

    public interface IMyInterface<out TValueInterface>

    It seems you cannot use covariant type parameters, otherwise you will get this exception.

    For more information, see this blog post.

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