.NET - Set all Entity current values to new values without specifying separate properties

I have two entities, one is the one in the database the other is the new value i received from the controller.

Now i want to update the entity in the Database without specifying all the different properties;

Instead of:

public async Task UpdateFoo(Foo fooNew){
    Foo fooDb = await context.Foo
        .Include(f => f.Child)
        .Where(f => f.Id == 1)
        .FirstOrDefaultAsync();

    fooDb.Value01 = fooNew.Value01;
    fooDb.Value02 = fooNew.Value02;
    fooDb.Child.ValueA = fooNew.Child.ValueA;

    context.SaveChangesAsync()
}

I want to do something like;

public async Task UpdateFoo(Foo fooNew){
    Foo fooDb = await context.Foo
        .Include(f => f.Child)
        .Where(f => f.Id == 1)
        .FirstOrDefaultAsync();

    fooDb = fooNew;

    context.SaveChangesAsync()
}

I tried using CurrentValues.SetValues;

context.Entry(fooDb).CurrentValues.SetValues(fooNew);

This results in an error because of the key being marked as modified;

The property 'Id' on entity type 'Foo' is part of a key and so cannot be modified or marked as modified.

Is there a way to overwrite and save all entity properties (and entity child properties) without specifying them one by one?