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C# accessing GUI object outside of the mainform class

Posted on 2011-02-23
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Last Modified: 2012-05-11
Experts:

I have a MainForm class and a UI class.  The UI class is meant to handle things like populating tables and handling actions of the UI.  The item I'm trying to add objects to is a list and is defined in the MainForm class as "CompsList".

I tried to access that list with the code:

this.CompsList.Items.Add(...);

I get an error on the THIS statement, and if I remove that, I get a message stating CompsList doesn't exist.

How can I access the object to add or remove items when I want to?
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Question by:piattnd
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Expert Comment

by:Mike Tomlinson
ID: 34962582
CompsList in MainForm would need to Public.  Then, you'd have to pass a REFERENCE to MainForm into your UI Class so that it can access it.
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Author Comment

by:piattnd
ID: 34962700
public System.Windows.Forms.ListView CompsList;

That is the code that creates the list view in MainForm.  I tried to then use this line of code to execute the add of the list view item:

CompsList.Items.Add(listViewItem1);

Still getting an error saying CompsList isn't found.  Pardon the ignorance here, but I'm still not sure what I'm missing.  I understand what's going on, just not sure why or how you're meaning to get around it.
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Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 34962760
I assume MainForm creates an instance of the UI Class?

One way to do it:
public partial class MainForm : Form
    {

        public UIClass uc = new UIClass();
        public System.Windows.Forms.ListView CompsList;

        public MainForm()
        {
            InitializeComponent();
            uc.MyMainForm = this; // <--- pass reference to our MainForm into UIClass
        }

    }

    public class UIClass
    {

        public MainForm MyMainForm;

        private void Foo()
        {
            MyMainForm.CompsList.Items.Add(...)
        }
    }

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Author Closing Comment

by:piattnd
ID: 34963994
Worked perfectly AND I think it actually makes sense!  Great thorough answer, just a lack of brain power on my part!

Thanks.
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