Vista - Window.Loaded

Hi!

I noticed that my Window.Loaded eventhandler is triggered twice. When I
remove the event wiring from the Xaml the handler is not being called so I
know I didn't trigger the Loaded method by hand.

Anybody any clue or suggestion what is going on?

Thanks!

Erno
----
WPF tutorials: http://blogs.infosupport.com/ernow/articles/1878.aspx

I'm seeing something similar to this, too, for example, in MyApp.xaml
with the following code:

<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Styles.xaml"/>
..
..
..

Error at element 'ResourceDictionary' in markup file 'Window1.xaml' :
Item has already been added. Key in dictionary: 'lbiDataTemplate1' Key
being added: 'lbiDataTemplate1'.

I've found that if I rebuild the project, everything works and I don't
get the error. It can happen after a minor edit of an unrelated XAML
file in the project.

Greg


Erno wrote:
> Hi!
>
> I noticed that my Window.Loaded eventhandler is triggered twice. When I
> remove the event wiring from the Xaml the handler is not being called so I
> know I didn't trigger the Loaded method by hand.
>
> Anybody any clue or suggestion what is going on?
>
> Thanks!
>
> Erno
> ----
> WPF tutorials: http://blogs.infosupport.com/ernow/articles/1878.aspx
>
>
>

Solved, I think. I forgot to REMOVE one of the old "<?Mapping" PIs from
a XAML file after making the described changes for Feb CTP.

Greg

Greg K wrote:
> I'm seeing something similar to this, too, for example, in MyApp.xaml
> with the following code:
>
> <Application.Resources>
> <ResourceDictionary>
> <ResourceDictionary.MergedDictionaries>
> <ResourceDictionary Source="Styles.xaml"/>
> ..
> ..
> ..
>
> Error at element 'ResourceDictionary' in markup file 'Window1.xaml' :
> Item has already been added. Key in dictionary: 'lbiDataTemplate1' Key
> being added: 'lbiDataTemplate1'.
>
> I've found that if I rebuild the project, everything works and I don't
> get the error. It can happen after a minor edit of an unrelated XAML
> file in the project.
>
> Greg
>
>
> Erno wrote:
>> Hi!
>>
>> I noticed that my Window.Loaded eventhandler is triggered twice. When
>> I remove the event wiring from the Xaml the handler is not being
>> called so I know I didn't trigger the Loaded method by hand.
>>
>> Anybody any clue or suggestion what is going on?
>>
>> Thanks!
>>
>> Erno
>> ----
>> WPF tutorials: http://blogs.infosupport.com/ernow/articles/1878.aspx
>>
>>
>>

Greg,

I don't see how this relates to 'my' problem...

Cheers

Erno

"Greg K" <gregk@smudgeybear.com> wrote in message
news:%23muyfKIOGHA.1288@TK2MSFTNGP09.phx.gbl...
> I'm seeing something similar to this, too, for example, in MyApp.xaml with
> the following code:
>
> <Application.Resources>
> <ResourceDictionary>
> <ResourceDictionary.MergedDictionaries>
> <ResourceDictionary Source="Styles.xaml"/>
> .
> .
> .
>
> Error at element 'ResourceDictionary' in markup file 'Window1.xaml' : Item
> has already been added. Key in dictionary: 'lbiDataTemplate1' Key being
> added: 'lbiDataTemplate1'.
>
> I've found that if I rebuild the project, everything works and I don't get
> the error. It can happen after a minor edit of an unrelated XAML file in
> the project.
>
> Greg
>
>
> Erno wrote:
>> Hi!
>>
>> I noticed that my Window.Loaded eventhandler is triggered twice. When I
>> remove the event wiring from the Xaml the handler is not being called so
>> I know I didn't trigger the Loaded method by hand.
>>
>> Anybody any clue or suggestion what is going on?
>>
>> Thanks!
>>
>> Erno
>> ----
>> WPF tutorials: http://blogs.infosupport.com/ernow/articles/1878.aspx
>>
>>

Erno,

Granted it may not be related, but you mentioned that your Window.Loaded
event handler was being called twice, and from the error message I
posted, my DataTemplate is being merged twice into the
ResourceDictionary in Application.Resources. Both your problem and mine
appear to happen on startup as well, and I assume your app was working
as well unchanged with Jan/Dec CTP.

If you leave the Loaded event wired, does the problem still occur if you
do a complete project rebuild, then run it ?

Greg

Erno wrote:
> Greg,
>
> I don't see how this relates to 'my' problem...
>
> Cheers
>
> Erno
>
> "Greg K" <gregk@smudgeybear.com> wrote in message
> news:%23muyfKIOGHA.1288@TK2MSFTNGP09.phx.gbl...
>> I'm seeing something similar to this, too, for example, in MyApp.xaml with
>> the following code:
>>
>> <Application.Resources>
>> <ResourceDictionary>
>> <ResourceDictionary.MergedDictionaries>
>> <ResourceDictionary Source="Styles.xaml"/>
>> .
>> .
>> .
>>
>> Error at element 'ResourceDictionary' in markup file 'Window1.xaml' : Item
>> has already been added. Key in dictionary: 'lbiDataTemplate1' Key being
>> added: 'lbiDataTemplate1'.
>>
>> I've found that if I rebuild the project, everything works and I don't get
>> the error. It can happen after a minor edit of an unrelated XAML file in
>> the project.
>>
>> Greg
>>
>>
>> Erno wrote:
>>> Hi!
>>>
>>> I noticed that my Window.Loaded eventhandler is triggered twice. When I
>>> remove the event wiring from the Xaml the handler is not being called so
>>> I know I didn't trigger the Loaded method by hand.
>>>
>>> Anybody any clue or suggestion what is going on?
>>>
>>> Thanks!
>>>
>>> Erno
>>> ----
>>> WPF tutorials: http://blogs.infosupport.com/ernow/articles/1878.aspx
>>>
>>>
>

Wow! A full rebuild cleared that up!

Ok, I'm switching to Always full rebuild...

Thanks Greg!


Erno
----
WPF tutorials: http://blogs.infosupport.com/ernow/articles/1878.aspx




"Greg K" <gregk@smudgeybear.com> wrote in message
news:%23oSgCNMOGHA.1460@TK2MSFTNGP10.phx.gbl...
> Erno,
>
> Granted it may not be related, but you mentioned that your Window.Loaded
> event handler was being called twice, and from the error message I posted,
> my DataTemplate is being merged twice into the ResourceDictionary in
> Application.Resources. Both your problem and mine appear to happen on
> startup as well, and I assume your app was working as well unchanged with
> Jan/Dec CTP.
>
> If you leave the Loaded event wired, does the problem still occur if you
> do a complete project rebuild, then run it ?
>
> Greg
>
> Erno wrote:
>> Greg,
>>
>> I don't see how this relates to 'my' problem...
>>
>> Cheers
>>
>> Erno
>>
>> "Greg K" <gregk@smudgeybear.com> wrote in message
>> news:%23muyfKIOGHA.1288@TK2MSFTNGP09.phx.gbl...
>>> I'm seeing something similar to this, too, for example, in MyApp.xaml
>>> with the following code:
>>>
>>> <Application.Resources>
>>> <ResourceDictionary>
>>> <ResourceDictionary.MergedDictionaries>
>>> <ResourceDictionary Source="Styles.xaml"/>
>>> .
>>> .
>>> .
>>>
>>> Error at element 'ResourceDictionary' in markup file 'Window1.xaml' :
>>> Item has already been added. Key in dictionary: 'lbiDataTemplate1' Key
>>> being added: 'lbiDataTemplate1'.
>>>
>>> I've found that if I rebuild the project, everything works and I don't
>>> get the error. It can happen after a minor edit of an unrelated XAML
>>> file in the project.
>>>
>>> Greg
>>>
>>>
>>> Erno wrote:
>>>> Hi!
>>>>
>>>> I noticed that my Window.Loaded eventhandler is triggered twice. When I
>>>> remove the event wiring from the Xaml the handler is not being called
>>>> so I know I didn't trigger the Loaded method by hand.
>>>>
>>>> Anybody any clue or suggestion what is going on?
>>>>
>>>> Thanks!
>>>>
>>>> Erno
>>>> ----
>>>> WPF tutorials: http://blogs.infosupport.com/ernow/articles/1878.aspx
>>>>
>>>>
>>

I was getting the same problem.

you need to set e.Handled=true at the end of your OnLoaded handler.

private void OnLoaded(object sender, RoutedEventArgs e)
{
...
e.Handled = true;
}

I think that this is a hack or work-around and definitly not the way to do
this.

Full rebuild fixed it for me.


Erno
----
WPF tutorials: http://blogs.infosupport.com/ernow/articles/1878.aspx



"damien morton" <damien.morton@gmail.com> wrote in message
news:1140805758.876996.40500@e56g2000cwe.googlegroups.com...
>I was getting the same problem.
>
> you need to set e.Handled=true at the end of your OnLoaded handler.
>
> private void OnLoaded(object sender, RoutedEventArgs e)
> {
> ...
> e.Handled = true;
> }
>

Full rebuild didnt seem to stop the two OnLoaded events for me.