Question

So I have a program in which I am telling the user whether two skeletons match, but the thing is that I need to access the label via a class. The error I keep getting is

Error1  An object reference is required for the
non-static field, method, or property 
'WpfApplication1.MainWindow.matchLabel'

Here’s what I have in my code:

The static Label

static Label matching
    {
        get { return matchLabel; } //errors here
        set { matchLabel = value; } //and here
    }

The Class

private class Scan
    {
        private void Start()
        {
            Skeleton skeleton = new Skeleton();

            if (PersonDetected == true)
            {
                int SkeletonID2 = skeleton.TrackingId;

                if (SkeletonID1 == SkeletonID2)
                {
                    matching.Content = "Your IDs are Matching!";
                }

                else if (SkeletonID2 != SkeletonID1)
                {
                    matching.Content = "Your IDs don't Match.";
                }
            }
        }

        private void Stop()
        {
            if (PersonDetected == true)
            {
                matching.Content = "Scan Aborted";
            }
        }
    }

Basically I want to know how to make the label in wpf static, or if there is another way to do this.
Thanks in advance

Answer 1

I think that you could use another approach, like @Daniel said, using UI elements on multiple threads is a bad idea.

If my understanding is correct, you just want to notify to the user the result from your domain logic, the way I would do it is simple, create an event:

public event Action<string> MyEvent = delegate { };

            if (SkeletonID1 == SkeletonID2)
            {
                this.MyEvent("Your IDs are Matching!");
            }

            else if (SkeletonID2 != SkeletonID1)
            {
                this.MyEvent("Your IDs don't Match.");
            }

 if (PersonDetected == true)
            {
                this.MyEvent("Scan Aborted");
            }

In your WPF view

this.MydomainComponent.MyEvent += (x) => { this.matchLabel.Content = x; };