Deriving with "heavy" constructors

[EdgarBM]

Hi, we're creating a class scheme which needs to keep the properties instances from the childs classes on the main base class. To do this we're passing the instance of each class once by each child constructor to the main one, I mean: class child (propertyX A) : base (A) {...} ...this way we pass the instance of one property to the child class when it's instanced so the base class will get it. It works. The only problem is that the VS.NET IDE doesn't shows the child window in the design mode, getting an Exception message explaining that there's no instance of the base object or other strange messages like this. Does anyone knows a solution or a cause? Thank you in advance, Edgar Edgar Berengena Moreno Software Engineer Appeyron Research

[leppie]

Hi, For that too work you are gonna need a default constructor, in fact for any designer to work, you will need the default constructor. The default constructor is a constructor that takes no arguements. In your case, you could do this: public DerivedControl():base("some value here") { this.var1 = default1; this.var2 = default2; } UPDATE: Note this is only really for designer support. At runtime use your own construtors. :) Hope this helps :) MYrc : A .NET IRC client with C# Plugin Capabilities. See http://sourceforge.net/projects/myrc for more info. :-D

[Ryan Cromwell]

You know I was extremely irritated when I had the same problems earlier. Thanks for the tip...