如何根据 TabControl 中选定的选项卡使用特定的 class？

Question

I have a TabControl with the TabPages named foo , bar , abd baz in the Main form. When a user changes to the bar tab I want it to use the code in the bar.cs class, when a user changes to the baz tab, I want to run the code in the baz.cs class, etc. Kind of like an "all-in-one" form in the sense that it has multiple different functionalities but I don't want all the code to be in one single class.

How can I achieve this? Is this even the proper way of doing something like this?

Answer 1

If you're just looking to break up the code so you don't have one enormous Form then a standard approach is to break the contents of each tab page out into a custom User Control (a reusable composite control).

1. In Visual Studio, add a new item to your project and select "User Control".
2. Use the designer to add whatever controls/logic/events/properties you want.
3. Build your project. After the build is complete, you should see your new UserControl in the VS Toolbox, probably near the top.
4. Drag your control onto the desired TabPage in your Form. Set its Dock property to Full so it fills the tab control.

Answer 2

Maybe I'm not understanding the question, but it seems rather straightforward to me that you can subscribe to the SelectedIndexChanged event, instantiate the appropriate class, and run the code.

private void OnSelectedIndexChanged(object sender, EventArgs e)
{
    switch (myTabControl.SelectedTab.Name)
    {
        case "foo":
        {
            var o = new foo();
            o.RunCode();
            break;
        }
        case "bar":
        {
            var o = new bar();
            o.RunCode();
            break;
        }
        case "baz":
        {
            var o = new baz();
            o.RunCode();
            break;
        }

    }
}