Deriving from a component and implementing IDisposable properly

Question

I have a Visual Studio 2008 C# .NET 2.0 CF project with an abstract class derived from Component. From that class, I derive several concrete classes (as in my example below). But, when I go to exit my Form, though the Form's Dispose() member is called and components.Dispose() is called, my components are never disposed. Can anybody suggest how I can fix this design? ``` public abstract class SomeDisposableComponentBase : Component { private System.ComponentModel.IContainer components; protected SomeDisposableComponentBase() { Initializecomponent(); } protected SomeDisposableComponentBase(IContainer container) { container.Add(this); Initializecomponent(); } private void InitializeComponent() { components = new System.ComponentModel.Container(); } protected abstract void Foo(); #region IDisposable Members bool disposed_; /// Warning 60 CA1063 : Microsoft.Design : Ensure that 'SomeDisposableComponentBase.Dispose()' is declared as public and sealed.* public void Dispose() { // never calle…

Accepted Answer

`SomeDisposableComponentBase` should override `Component.Dispose(Boolean)`.

You also need to delete the `SomeDisposableComponentBase.Dispose()` method (that takes no arguments), because it hides the `Component.Dispose` implementation, so they're treated as different methods, depending on how you declare your variables:

```
using (Component component = new SomeDisposableComponent()) {
    // Calls Component.Dispose upon exiting the using block
}

using (SomeDisposableComponentBase component = new SomeDisposableComponent()) {
    // Calls SomeDisposableComponentBase.Dispose upon existing the using block
}
```

Deriving from a component and implementing IDisposable properly

Solution

Problem