WEBfactory 2010

<UserControl x:Class="ClientSDKExample.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White" VerticalAlignment="Center" HorizontalAlignment="Center">
        <StackPanel Orientation="Horizontal">
            <StackPanel Orientation="Vertical" Margin="2">
                <TextBlock Text="Register and Read" FontWeight="Bold"></TextBlock>
                <TextBlock Name="SignalValueLabel"></TextBlock>
            </StackPanel>
            <StackPanel Orientation="Vertical" Margin="2">
                <TextBlock Text="Write" FontWeight="Bold"></TextBlock>
                <TextBox Name="SignalInput" KeyUp="SignalInput_KeyUp"></TextBox>
            </StackPanel>
            <StackPanel Orientation="Vertical" Margin="2">
                <TextBlock Text="Internationalization" FontWeight="Bold"></TextBlock>
                <TextBlock Name="SymbolicTextLabel"></TextBlock>
                <Button Name="ENButton" Content="EN" Click="ENButton_Click"></Button>
                <Button Name="DEButton" Content="DE" Click="DEButton_Click"></Button>
            </StackPanel>
        </StackPanel>
    </Grid>
</UserControl>

<UserControl
	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
	xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
	x:Class="ClientSDKExample.MainPage"
	Width="640" Height="480">

	<Grid x:Name="LayoutRoot" Background="White">
		<TextBlock HorizontalAlignment="Left" Margin="135,198,0,0" TextWrapping="Wrap" Text="Register and Read" 
		VerticalAlignment="Top" FontWeight="Bold"/>
		<TextBlock x:Name="SignalValueLabel" HorizontalAlignment="Left" Margin="135,219,0,0" TextWrapping="Wrap" 
		Text="TextBlock" VerticalAlignment="Top"/>
		<TextBlock HorizontalAlignment="Left" Margin="257,198,0,0" TextWrapping="Wrap" Text="Write" VerticalAlignment="Top" 
		FontWeight="Bold"/>
		<TextBox x:Name="SignalInput" HorizontalAlignment="Left" Height="23" Margin="257,219,0,0" TextWrapping="Wrap" 
		Text="TextBox" VerticalAlignment="Top" Width="120" KeyUp="SignalInput_KeyUp"/>
		<TextBlock HorizontalAlignment="Left" Margin="388,198,0,0" TextWrapping="Wrap" Text="Internationalization" 
		VerticalAlignment="Top" FontWeight="Bold"/>
		<TextBlock x:Name="SymbolicTextLabel" HorizontalAlignment="Left" Margin="388,219,0,0" TextWrapping="Wrap" 
		Text="TextBlock" VerticalAlignment="Top"/>
		<Button x:Name="ENButton" Content="EN" HorizontalAlignment="Left" Margin="388,240,0,0" VerticalAlignment="Top" 
		Width="75" Click="ENButton_Click"/>
		<Button x:Name="DEButton" Content="DE" HorizontalAlignment="Left" Margin="388,267,0,0" VerticalAlignment="Top" 
		Width="75" Click="DEButton_Click"/>
	</Grid>
</UserControl>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using WFSilverlight.Core;

namespace ClientSDKExample
{
    public partial class MainPage : UserControl, IDisposable
    {
        public MainPage()
        {
            InitializeComponent();
            Loaded += UserControl_Loaded; //register to the Loaded event of the UserControl
        }

        private WFConnector wfConnector;
        private const string SignalName = "Setpoint 2";
        private string[] MySymbolicTexts = new string[] { "SymbolicText" };

        //REGISTER and READ operations start here
        private void UserControl_Loaded(object sender, RoutedEventArgs e) //here is what happens when the UserControl is loaded
        {
            if (!System.ComponentModel.DesignerProperties.GetIsInDesignMode(this)) //the next code will happen only at run time
            {
                wfConnector = new WFConnector(false); //initializing new connector instance
                wfConnector.RegisterSignalChangedHandler("", SignalName, SignalChanged); 
			//registering to the signal changed event handler
                wfConnector.RegisterLanguageChangedHandler(MySymbolicTexts, OnLanguageChanged); 
			//registering to the language changed event handler
            }
        }

        void SignalChanged(string name, object value) //the delegate method from the RegisterSignalChangedHandler event handler
        {
            if (value != null)
            {
                SignalValueLabel.Text = value.ToString(); //write the value to the label if it is not null
            }
        }
        
        //WRITE operations start here
        private void SignalInput_KeyUp(object sender, KeyEventArgs e) 
	//the Key Up event handler method for the SignalInput text bock
        {
            if (e.Key == Key.Enter) //checking if the Entery key is pressed used
            {
                wfConnector.WriteSignal("", SignalName, SignalInput.Text, WriteSignalHandler); 
		//writing the value to the signal            }
        }

        private void WriteSignalHandler(Exception error, int[] results) //validating the write operation
        {
            var errorCode = results == null ? 0 : results.FirstOrDefault();

            if (!IsWritingSuccessful(error, results)) //displaying the error code if the writing is not succesful
            {
                string errorMessage = error != null
                                            ? error.Message
                                            : "Write failed with error code: " + errorCode;

                MessageBox.Show(errorMessage); //
            }
        }

        private bool IsWritingSuccessful(Exception error, IEnumerable<int> results) 
	//the method that checks if any error code returned when writing
        {
            var errorCode = results == null ? 0 : results.FirstOrDefault();
            return error == null && errorCode == 0;
        }

        //INTERNATIONALIZATION operations start here
        private void OnLanguageChanged(string[] symbolicNames, string[] translationTexts)
	// the method that writes the translations to the SymbolicTextLabel
        {
            SymbolicTextLabel.Text = translationTexts[0];
        }
        
        private void ENButton_Click(object sender, RoutedEventArgs e)
        {
            wfConnector.SetLanguageId(9); //setting the English language on the Click event
        }

        private void DEButton_Click(object sender, RoutedEventArgs e)
        {
            wfConnector.SetLanguageId(7); //setting the German language on the Click event
        }

        //DISPOSE section starts here
        public void Dispose() //the Dispose method from IDisposable
        {
            DisposeConnector();
        }

        private void DisposeConnector()
        {
            if (wfConnector == null) return; //checking if the connector is null
            wfConnector.UnregisterSignalChangedHandler("", SignalName, SignalChanged); 
		//unregistering from the signal changed event handler
            wfConnector.UnregisterLanguageChangedHandler(MySymbolicTexts, OnLanguageChanged); 
		//unregistering from the language changed event handler

            wfConnector.Dispose(); //disposing the connector
            wfConnector = null; //setting the connector to null so it won't be disposed again
        }  
    }
}