How to cast a generic class on more generic types-CodePudding

I've found only older answers to this question, that's why I try it again in the hope, that there is a solution.

I have a generic class that takes objects of classes which implement a specific interface. I can easily write a class implementing the interface on a variable of the type of this interface.

What I can't do is, creating a generic class that takes an instance of a class and write it on a variable of the same generic class that needs its class to only implement the interface.

public interface IBar {}

public class Foo : IBar {}

public class MyClass<T> where T : IBar 
{
    public T Value { get; set; }
}

// works 
IBar fooAsBar = new Foo();

// visual studio / compiler says no...
MyClass<IBar> classWithFooAsBar = new MyClass<Foo>();

Is there any way so I can convert MyClass in some way to MyClass? In the case were I need it, I only need to access the Value property and everything else does not matter for me.

CodePudding user response：

As the comments mentioned, it is basically not possible for goot reasons. What I did to achiv my goal was to create a wrapper class:

public interface IBar {}

public class Foo : IBar {}

public class MyClass<T> where T : IBar 
{
    public T Value { get; }
}

public class MyWrapper
{
    public IBar Value { get; }

    public MyWrapper(IBar myBar)
    {
        this.Value = myBar;
    }
}

// works 
IBar fooAsBar = new Foo();

// visual studio / compiler says yes...
MyWrapper classWithFooAsBar = new MyWrapper(new Foo());
IBar myBar = classWithFooAsBar.Value;