How to start an internationalized WPF-Project in SharpDevelop 4.2?

Question

I want to create a Software, where the User can choose between several Languages.

As a start i want to learn how to handle Internationalization, since i have never

Answer 1

If you created two ResourceDictionary files you can binding by DynamicResource.

Example:

First resource file (Lang.en-US.xaml):

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:system="clr-namespace:System;assembly=mscorlib">

    <system:String x:Key="Username">Username:</system:String>
    <system:String x:Key="Password">Password:</system:String>
    <system:String x:Key="close">Close</system:String>
    <system:String x:Key="login">Login</system:String>        
</ResourceDictionary>

Second resource file (Lang.pl-PL.xaml):

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:system="clr-namespace:System;assembly=mscorlib">

    <system:String x:Key="Username">Login:</system:String>
    <system:String x:Key="Password">Hasło:</system:String>
    <system:String x:Key="close">Zamknij</system:String>
    <system:String x:Key="login">Zaloguj</system:String>
</ResourceDictionary>

Set default language in Application resources:

 <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Lang.en-US.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
 </Application.Resources>

Let's say that we have ComboBox like below:

<ComboBox Name="cbLang" Margin="2" SelectionChanged="cbLang_SelectionChanged" >
                <ComboBoxItem Content="English" Tag="en-US" />
                <ComboBoxItem Content="Polish" Tag="pl-PL" />
  </ComboBox>

Code-behind SelectionChanged:

 private void cbLang_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
        {
            ResourceDictionary dict = new ResourceDictionary();

            switch (((sender as ComboBox).SelectedItem as ComboBoxItem).Tag.ToString())
            {
                case "en-US":
                    dict.Source = new Uri("Lang.en-US.xaml", UriKind.Relative);
                    break;
                case "pl-PL":
                    dict.Source = new Uri("Lang.pl-PL.xaml", UriKind.Relative);
                    break;
                default:
                    break;
            }
            this.Resources.MergedDictionaries.Add(dict);
        }

And you can binding like this:

 <TextBlock Text="{DynamicResource Username}" VerticalAlignment="Center" />