c# change form strings on another thread

Question

My code which changes caption of navigation bar items:

OverviewOrgan_NavBarHelper cNavBarHelper = new OverviewOrgan_NavBarHelper(Organization);

foreach (NavBarItem item in GetNavigationBar.Items)
{                       
    string cCaption = cNavBarHelper.UpdateNavBarItemCaption(item);
    item.Caption = cCaption;
}

now it is on the main thread, but I have to move it to another thread. As I know that UI should not be changed from another threat, then it is made, so I thought about using BackgroundWorker. In fact, that I'm not in working with threads, can someone suggest the best solution for my task?

score 5 · Answer 1 · edited May 23 '17 at 11:56

5

You can use Invoke to update the UI from another thread.

Take a look at this post: How to update the GUI from another thread in C#?

For Example:

MethodInvoker NavBarItemInvoker = (delegate
{
   OverviewOrgan_NavBarHelper cNavBarHelper = new OverviewOrgan_NavBarHelper(Organization);

   foreach (NavBarItem item in GetNavigationBar.Items)
   {                       
       string cCaption = cNavBarHelper.UpdateNavBarItemCaption(item);
       item.Caption = cCaption;
   }
});

if (InvokeRequired)
{
   Invoke(NavBarItemInvoker);
}
else
{
    NavBarItemInvoker();
}

edited May 23 '17 at 11:56

Community

1
1

answered Jan 04 '13 at 10:24

HaemEternal

2,229
6
31
50

NavBarItem not have invoke method – Edgar Jan 04 '13 at 10:27
You can let an other thread run code on the main thread. Look at the link he gave you. – Laurence Jan 04 '13 at 10:29
1

The NavBarItem does not have Invoke, but the NavBar itself - which is the owner of the item. Otherwise you can find the topmost form using Application.OpenForms and call Invoke on that form. Refer to [How to get main form](http://stackoverflow.com/questions/1000847/how-to-get-the-handle-of-the-topmost-form-in-a-winform-app) – Matthias Jan 04 '13 at 10:38

score 2 · Answer 2 · answered Jan 04 '13 at 10:27

2

I think you should use a dispatcher for that

read more about it in this article: http://msdn.microsoft.com/en-us/magazine/cc163328.aspx

answered Jan 04 '13 at 10:27

Moriya

7,750
3
35
53

I use Windows Forms, not WPF – Edgar Jan 04 '13 at 10:29

score 2 · Accepted Answer · edited May 23 '17 at 11:43

2

have a look at the first answer in this thread. It explains how to use a BackgroundWorker.

But the problem will be, that the items of you navigationbar are created whithin the UI-Thread (assuming that you are using WPF) and those cannot be manipulated from another thread.

Why do you have to do it in another thread?

edited May 23 '17 at 11:43

Community

1
1

answered Jan 04 '13 at 10:46

medasocles

61
5

c# change form strings on another thread

3 Answers3