Question

i want to create a Window in an ControlLibrary called MyWindow so that i can define a Standard Look for all my new Applications (for example i want to put an Icon in the MyWindow) and some basic logic so i can inherit from that window in other Wpf-Applications.

But if i try to inherit MyWindow in another application i get an error …

Can somebody give me a hint how i can solve this problem?

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i have tow projects:
1. my ControlLib where i define a Base Window
2. A Project where i want to use my Base as the main Window

My Base Window looks like the following:

<Window x:Class="BaseWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Icon="GeoAS.ico"
Title="BaseWindow" Height="300" Width="300"
Background="black">
  <Grid>

  </Grid>
</Window>

This in the Namespace MyControllLib.
I’ve added this Lib as a reference to my Project where i want to use this Window as my Main Window.

I expected to put somthing like this is my Codebehind from the new Window:

Class Window1
Inherits MyControlLib.BaseWindow

End Class

But the compiler put out an error (i have to translate, because the error is in german):
The Baseclass of the Window1-Class has not to be different from the myControlLib.BaseWindow-Baseclass.

I have no idea whats to do

Answer 1

Your BaseWindow class should be in pure code. Like this:

public class BaseWindow : Window
{
    public BaseWindow()
    {
        // Code modified here
        Uri iconUri = new Uri("pack://application:,,,/MyControlLib;component/my.ico", UriKind.RelativeOrAbsolute);
        Icon = BitmapFrame.Create(iconUri);
        Title = "BaseWindow";
        Height = 300;
        Width = 300;
        Background = Brushes.Black;
    }
}

and your derive class can be either in pure code or in xaml and code both. In first case you need to do just this:

public partial class Window1 : BaseWindow
{
    public Window1()
    {
        InitializeComponent();
    }
}

but in second case you need to drive your xaml also, like this:

<local:BaseWindow x:Class="ErrorTemplatePOC.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MyControlLib;assembly=MyControlLib">
</local:BaseWindow>