Question

I’m working on a Windows Forms application in C# with Visual Studio 2010.

• There is a form mainForm.
• mainForm contains a tree view control xmlTreeView.
• There is a self-written class myClass.cs.

Now, myClass needs to access the xmlTreeView. However I don’t know a) how to access the form and b) which way would be best to do that.

I tried to implement an interface following oleksii’s answer but I don’t get it. The main form of the application is defined like this:

public interface IMainForm {
  TreeView treeView { get; }
} 

public partial class mainForm : Form, IMainForm {

  public TreeView treeViewControl {
    get { return myTreeViewControl; }
  }

  // Some code here
  [...]

  RuleTree rt = new RuleTree(); //How do I call this with the IMainForm interface???
}

Another class RuleTree is defined like this:

class RuleTree {
  private readonly IMainForm mainForm;
  public RuleTree(IMainForm mainForm) {
    this.mainForm = mainForm;
  }

}

How do I call the constructor of RuleTree with the IMainForm interface???

Answer 1

I would do the following. Don’t see it as code, it’s just so that you can understand, you can modify it accordingly.

public class MyClass
{
     public void MyMethod(YourTreeViewControl treeview)
     {
          // Do what you need to do here
     }
}

Then in your forms code behind just instantiate MyClass and pass an instance of your treeview to it, something like this:

MyClass myClass = new MyClass();
myClass.MyMethod(tvYourTreeViewControl);

Hope this makes sense 🙂