Implementing IComponent

Article:		Implementing Custom Data Bindable Classes: CollectionBase
Subject:		Implementing IComponent
Date:		2003-06-12 08:45:12
From:		jamesstill

Someone wrote to me and asked if it were possible to interact with this custom collection at design time. To do it you have to turn the class into a component. It's not as hard as it sounds really. You just have to implement IComponent in addition to CollectionBase: public class Products : CollectionBase, IComponent { IComponent requires you to write two things, a virtual method for Dispose() and an accessor for Site. Microsoft recommends that consumers of components explicitly call Dispose() rather than leaving them to the GC to cleanup. So put a public event in the Products class for the method to call: public event EventHandler Disposed; ... public virtual void Dispose() { if (Disposed != null) Disposed(this, EventArgs.Empty); } You'll also have to implement the Site property and return an ISite to the caller. I won't go into that here but you can find an example on MSDN at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemcomponentmodelicomponentclasstopic.asp.

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Implementing IComponent
2003-12-18 11:36:56 anonymous2 [Reply | View]

I bet you could use it as a base for a custom control, but you would just have to provide the designer for it, which to me is the most difficult part of developing a custom control.