WPF Keyboard input UI thread issue?

[Studlyami]

I have a simple application which includes a default window (named Window1) with no additional xaml.

Window1 consists of a timerclass object which contains a timer running at 60hrz.

        
public Window1()
        {//in Window1.xaml.cs
            MainTimerClass = new TimerClass(); //my timer class object
        }

The Timer class consists of an object which handles keyboard operations
Keyboard class is defined as below.

 class KeyboardHandle
    {
        public KeyboardHandle()
        {
        }

        public void ProcessKeyboardEvent(ref Hashtable MappedKeyTable)
        {
            foreach (DictionaryEntry de in MappedKeyTable)
            {
                Key TempKey = (Key)de.Key;
                if(Keyboard.IsKeyDown(TempKey))
                {
                    int pq = (int)de.Value;
                }
            }
        }

The Timer calls the ProcessKeyboard Event 60 times a second. When i hit the line of code Keyboard.IsKeyD own(TempKey)) i get the runtime exception "The calling thread must be STA, because many UI components require this"

Basically I want my code to check a given set of keyboard keys to see if they are pressed or not. I saw that the GUI element of WPF runs on a different thread and I have to use the Dispatcher.Invo ke methods, but 1.) Why is the keyboard tied to a UI thread? two How can I use the dispatcher.Invo ke to get the keyboard state? Any ideas on how to do this? I could just use windows hooks or Wnd_Proc, but I would prefer not to... Any ideas/suggestions? Let me know if you need anything else posted.