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WPF, Delegates and Threads

November 8th, 2008 Elze Leave a comment Go to comments

Introduction:
When I started programming for the .NET Micro Framework one of the things that where a bit difficult to grab was how to update WPF UI elements (Like a text control) from a thread.

It has all to do with thread safety. Threads run (semi) simultainus and so there is the change that you access the same variable at the same time. When you have you’re own variables that you want make "Thread-Safe" you can use the lock statement (MSDN). When you’re developing for WPF you can use the Dispatcher and DispatcherTimer to  "Thread-Safe" access UI controls.

What is the Dispatcher?
You could look as a queue. The WPF thread constant looks at this queue for commands it can execute. You just have to push you’re command (=function) to this queue to execute it thread safe. So let’s look at how you can add you’re function to the queue.

Where are going to use the the default "Hello World" program that is created when you create a WPF solution. Also where making a simple thread that updates the Textbox with a random number ( Trough the Math.Random() ) function.

First we must make the Textbox and the new thread available outside the CreateWindow() command.

So just after public class Program : Microsoft.SPOT.Application add these lines:

private Text text;
private Thread UpdateText;

The first allows us to change the textbox content from our thread and the second will be our thread.

Becouse we already declared the text control you have to change the following line:

// Create a single text control.
text = new Text();

Creating a function and a delegate:
Now we have to define our delegate. You could look at a delegate as a function description. The allow you to make pointers to functions. Their also used for Events. (Delegates and Events in C# / .NET). This delegate is needed for adding our function to the WPF queue.

This is our delegate. It’s a function requiring one String, this is the new content for our textbox and it doesn’t return something:

// Delegate for changing the textbox
public delegate void ChangeTextBoxDelegate(String NewText);

And next we are going to make the actual function. It’s a simple function that places the String in the textbox and marks it as ‘dirty’:

// Actual function that changes the textbox
public void ChangeTextBox(String NewText)
{
    // Change content and mark as ‘dirty’
    text.TextContent = NewText;
    text.Invalidate();
}


Creating the thread:
Now we’ve made our delegate and function that we can add to the WPF queue for changing  the textbox we start building our thread. The thread contains an endless loop wherein it makes a string from a random number and places the function we’ve created with the new string as parameter on the WPF queue. Here is the thread:

// Thread that wants to update text control
public void UpdateTextThread()
{
    while (true)
    {
        // Create a sample text
        String TextForTextBox = Microsoft.SPOT.Math.Random(1000).ToString();

        // Invoke ChangeTextBox with 1 parameter (TextForTextBox)
       this.Dispatcher.BeginInvoke(new ChangeTextBoxDelegate(ChangeTextBox)new  object[] { TextForTextBox });

       // Sleep for a second
       Thread.Sleep(1000);
    }
} 

The interesting part of this thread is the BeginInvoke command. It places our function on the WPF queue with an parameter array that contains the String that we want to place in the textbox. You can see how our delegate is used for discribing our function.

The full program:
We’ve completed our program. Only the thread start isn’t handled but you’ll find it in the code. 

using System;
using System.Threading;

using Microsoft.SPOT;
using Microsoft.SPOT.Input;
using Microsoft.SPOT.Presentation;
using Microsoft.SPOT.Presentation.Controls;

namespace MFWindowApplication1
{
    public class Program : Microsoft.SPOT.Application
    {
        private Text text;
        private Thread UpdateText;

        public static void Main()
        {
            Program myApplication = new Program();

            Window mainWindow = myApplication.CreateWindow();

            // Create the object that configures the GPIO pins to buttons.
            GPIOButtonInputProvider inputProvider = new GPIOButtonInputProvider(null);

            // Start the application
            myApplication.Run(mainWindow);
        }

        private Window mainWindow;

        public Window CreateWindow()
        {
            // Create a window object and set its size to the
            // size of the display.
            mainWindow = new Window();
            mainWindow.Height = SystemMetrics.ScreenHeight;
            mainWindow.Width = SystemMetrics.ScreenWidth;

            // Create a single text control.
            text = new Text();

            text.Font = Resources.GetFont(Resources.FontResources.small);
            text.TextContent = Resources.GetString(Resources.StringResources.String1);
            text.HorizontalAlignment = Microsoft.SPOT.Presentation.HorizontalAlignment.Center;
            text.VerticalAlignment = Microsoft.SPOT.Presentation.VerticalAlignment.Center;

            // Add the text control to the window.
            mainWindow.Child = text;

            // Connect the button handler to all of the buttons.
            mainWindow.AddHandler(Buttons.ButtonUpEvent, new ButtonEventHandler(OnButtonUp), false);

            // Set the window visibility to visible.
            mainWindow.Visibility = Visibility.Visible;

            // Attach the button focus to the window.
            Buttons.Focus(mainWindow);

            // Thread that updates the text control
            UpdateText = new Thread(new ThreadStart(UpdateTextThread));
            UpdateText.Start();

            return mainWindow;
        }

        // Delegate for changing the textbox
        public delegate void ChangeTextBoxDelegate(String NewText);

        // Actual function that changes the textbox
        public void ChangeTextBox(String NewText)
        {
            // Change content and mark as ‘dirty’
            text.TextContent = NewText;
            text.Invalidate();
        }

        // Thread that wants to update text control
        public void UpdateTextThread()
        {
            while (true)
            {
                // Create a sample text
                String TextForTextBox = Microsoft.SPOT.Math.Random(1000).ToString();

                // Invoke ChangeTextBox with 1 parameter (TextForTextBox)
                this.Dispatcher.BeginInvoke(new ChangeTextBoxDelegate(ChangeTextBox), new object[] { TextForTextBox });

                // Sleep for a second
                Thread.Sleep(1000);
            }
        }

        private void OnButtonUp(object sender, ButtonEventArgs e)
        {
            // Print the button code to the Visual Studio output window.
            Debug.Print(e.Button.ToString());
        }
    }
}

  

 

 

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  1. snupi
    November 10th, 2008 at 11:12 | #1

    good information about the dispatcher is also available on msdn blog ‘Using the Dispatcher’ -> http://blogs.msdn.com/netmfteam/archive/2008/03/04/using-the-dispatcher.aspx

  2. November 10th, 2008 at 11:25 | #2

    Thanks snupi for you’re comment. I used this page when learning WPF. I made a link of “DispatcherTimer” to the link you provided

  3. October 24th, 2009 at 13:55 | #3

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  8. Hemang
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  9. August 12th, 2010 at 05:23 | #9

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  10. Ken
    January 15th, 2011 at 23:27 | #10

    You can also do like this:

    Dispatcher.BeginInvoke(delegate(object args)
    {
    mytextbox.TextContent = “MY TEXT (from the other thread)”;

    return null;

    }, null);

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