Inherited Window can not have a name?

Question

I'm having trouble with naming my Window which is inherited from its Base Window, when I try to give a name to my Window I get following error.

The type BaseWindow cannot have a Name attribute. Values types and types without a default constructor can be used as items within ResourceDictionary.

XAML :

<log:BaseWindow 
   x:Class="EtraabMessenger.MainWindow"
   x:Name="main"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
   xmlns:log="clr-namespace:EtraabMessenger.MVVM.View.Controls" 
   xmlns:VMCore="clr-namespace:EtraabMessenger.MVVM.VMCore" 
   VMCore:WindowClosingBehavior.Closing="{Binding DoCloseMainWindowCommand}"
   Height="464" Width="279">

</log:BaseWindow>

EDIT : Here is my BaseWindow class

public abstract class BaseWindow : Window, INotifyPropertyChanged
{
    protected BaseWindow()
    {
        // Note (Important) : This message should register on all windows
        // TODO : I'm planning to move this registeration to BaseWindow class
        Messenger.Register<bool>(GeneralToken.ClientDisconnected, DisconnectFromServer);
    }

    protected abstract void DisconnectFromServer(bool isDisconnected);
    protected abstract void RegisterTokens();
    protected abstract void UnRegisterTokens();

    ....
    ....
    ....

}

Any advice will be helpful.

`Values types and types without a default constructor can be used as items within ResourceDictionary.` - Is that really *"cannot"*? — Robert Harvey, Jul 10 '12 at 18:33
Is the solution as simple as adding a default (empty) constructor to your `BaseWindow` class? — Robert Harvey, Jul 10 '12 at 18:36
@RobertHarvey: Actually there is no 'not' in the message, if other cases citing the error are anything to go by... — H.B., Jul 10 '12 at 18:37
@H.B. I suspect it's a typo, as I would expect to see the word "only" in the original wording. — Robert Harvey, Jul 10 '12 at 18:39

H.B. · Accepted Answer · 2012-07-10T18:53:37.300

25

Your base window apparently, as the error states, needs a public default contructor (one without arguments), it also may not be abstract because an instance of it needs to be created.

edited Jul 10 '12 at 18:53

answered Jul 10 '12 at 18:36

H.B.

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@SaberAmani: The BaseWindow does not matter, you create an instance of an inherted type in XAML, you need a constructor without parameters. Though as this is the root object you might be able to use [`x:Arguments`](http://msdn.microsoft.com/en-us/library/ee795382.aspx) but i do not know for sure. – H.B. Jul 10 '12 at 18:38
@SaberAmani: Wait, of course the base window matters, that is what is instatiated, sorry. – H.B. Jul 10 '12 at 18:41
There is something else, my BaseWindow is a abstract class with protected constructor without any params. – saber Jul 10 '12 at 18:43
@SaberAmani: That doesn't sound good, most things XAML require public members. – H.B. Jul 10 '12 at 18:44
But It's inheritance and I don't think it causes problem, Right ? – saber Jul 10 '12 at 18:45
2

@SaberAmani: It does cause problems as you try to create an instance in XAML, this only works with a public constructor, also it cannot be abstract either, i just tested this. – H.B. Jul 10 '12 at 18:49

Inherited Window can not have a name?

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