How to Expose Listbox in UserControl in CustomTaskPane VSTO C#

问题

I am creating an application level add-in for Word 2010 using C# VSTO. I created a User Control, placed controls within it, and then used the User Control to add a Custom Task Pane:

UserControl myUserControl;
myUserControl = new PageElementsPane();
mytaskPane = this.CustomTaskPanes.Add
    (myUserControl, "Page Elements", doc.ActiveWindow);

So far so good. However, the User Control contains a listbox that I have not been able to access after the Custom Task Pane is added to the Custom Task Pane collection.

I have tried setting the Modifiers property on the listbox to Public. I have tried exposing the listbox on the User Control as a Public Property:

 public partial class PageElementsPane: UserControl
 {
    public ListBox ElementsPaneListBox
    {
        get { return lbxListbox; }
    }
 }

Additionally, I looked at this SO post:

Working with ListBox elements in a user control

I hoped I could adapt it, but my listbox IntelliSense does not have FindControl, offering FindForm instead. Is there a way to access the listbox within the User Control by somehow interpreting the Custom Task Pane as a form? Any help is greatly appreciated.

回答1:

It appears my foreach (and hence my cast) was not correct (per Eugene Astafiev's question in the comment above). I found this SO Post that suggesting looping with type Control instead of UserControl. I did this and all was good. Here is the code:

foreach (Control lbxControl in myUserControl.Controls)
{
    if (lbxControl is ListBox)
    {
        ((ListBox)lbxControl).SelectedIndex = 1;
    }
}

来源：https://stackoverflow.com/questions/30631473/how-to-expose-listbox-in-usercontrol-in-customtaskpane-vsto-c-sharp

标签

ms-word

vsto