c# - Convert derived class to base class

Question

I'm trying to refresh my memory but can't find answers with Google.

public class BaseClass
{
    public virtual void DoSomething()
    {
        Trace.Write("base class");
    }
}

public class DerivedClass : BaseClass
{
    public override void DoSomething()
    {
        Trace.Write("derived class");
    }
}

If I create an instance of derived class, how do I convert it to it's base class so that when DoSomething() is called, it uses the base class's method only?

A dynamic cast still calls the derived class's overridden method:

DerivedClass dc = new DerivedClass();

dc.DoSomething();

(dc as BaseClass).DoSomething();

Output: "derived class"

Answer 1

Although this sounds irrational but it works

 DerivedClass B = new DerivedClass();

BaseClass bc = JsonConvert.DeserializeObject<BaseClass>(JsonConvert.SerializeObject(B));