IDisposable with Multiple Levels of Inheritance

Question

Suppose you have the following inheritance chain:

class A : IDisposable
{
    public void Dispose()...
    protected virtual void Dispose(bool disposing)...
}

class B : A
{
    // Virtual or Override for B?
}

class C : B
{
    protected override void Dispose(bool disposing)...
}

If A, B, and C each have their own private IDisposable resources, how should B declare Dispose(bool)?

Answer 1

You should override, not hide:

class A : IDisposable
{
    public void Dispose() {
      Dispose(true);
      GC.SuppressFinalize(this); // <- May be excluded
    }

    protected virtual void Dispose(Boolean disposing)... // <- "disposing" recommended by Microsoft
}

class B : A
{
    protected override void Dispose(Boolean disposing) {
      // Dispose here all private resources of B
      ...
      base.Dispose(disposing);
    }
}

class C : B
{
    protected override void Dispose(Boolean disposing) {
      // Dispose here all private resources of C
      ...
      base.Dispose(disposing);
    }
}