Question on inheritance and component classes
I was thinking about inheritance and inheriting from a treenode. Is it possible to create a new class, inherit all from a treenode, and then use the new class to insert a node into a treeview? If so, how would I go about this?
The main reason I want to do this is for more .Tag properties.
Thanks!!
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Re: Question on inheritance and component classes
Taco, I use .NET 2003, but I don't think a ton has changed in this area..
You can use a custom treenode, but you will need to directcast it as the custom class at some points, or you can create a custom class that will sit in the tag of a regular tree node (as a tag is of type object and can hold any .net object)
here is an example. Its in 2003, but 2005 should be able to open it fine.
Re: Question on inheritance and component classes
Ahha, now I see where you need directcast. I have never used that before. Ok, I have tried to add a new node of type treenodeplus to my treeview but it tells me I cannot because of wrong type. I tried ctype once but nothing. If I used directcast on the treenodeplus node to add it into the treeview would that work?
Re: Question on inheritance and component classes
If your TreeNodePlus class inherits the TreeNode class then there is no reason that you should not be able to add it to a TreeView. You have to add a TreeNode to a TreeView's Nodes property and a TreeNodePlus object IS a TreeNode. You should only have to cast the object when you RETRIEVE it from the TreeView because it will be returned as a TreeNode reference. As an example, assume you go to a recruitment company who place programmers. They can place you because you are a VB.NET programmer, which inherits programmer. When someone gets you from the recruitment company they are getting a programmer, so they would need to tell everyone that you are a VB.NET programmer so that people would know that they could use your VB.NET skills.