Hi~~~

I look up many samples about XmlDataProvider.
But I found a problem.



If I add a XmlDataProvider in XML and want to C# code to access it. It
doesn't work.
But if I add a control or menu and assign this XmlDataProvider to its
DataContext.
Then the code works.

<!-- Sample XML -->
<XmlDataProvider x:Key="menuData">
<x:XData>
<Items xmlns="">
<Item Title="Foo..." GroupName="First Group">
<Item Title="A"/>
<Item Title="B"/>
<Item Title="C"/>
</Item>
<Item Title="Crimp" GroupName="Another Group" />
<Item Title="Splange" GroupName="Another Group" />
<Item Title="Frobnicate..." GroupName="Another One" />
<Item Title="Do stuff" GroupName="First Group" />
<Item Title="Mangle" GroupName="First Group" />
</Items>
</x:XData>
</XmlDataProvider>
....
<Menu DataContext="{StaticResource menuData}"/> <!-- if i remove this
line, then code doesn't work -->



// Code
XmlDataProvider xdp = FindResource("menuData") as XmlDataProvider;
if( xdp.Data == null )
MessageBox.Show("Data is not loaded");


I guess there's some initialized actions for XmlDataProvider by XAML
intrepreter.
But I can't find the mappings code or what should I write to let the
XmlDataProvider works.

Thank you for reading

BR,

HolaMan

In what method are you accessing the XmlDataProvider? If you're accessing it
in the Window/Page's constructor, then the data might not be loaded yet -
you're better off accessing it in a Loaded event handler.

"HolaMan" wrote:

> Hi~~~
>
> I look up many samples about XmlDataProvider.
> But I found a problem.
>
> If I add a XmlDataProvider in XML and want to C# code to access it. It
> doesn't work.
> But if I add a control or menu and assign this XmlDataProvider to its
> DataContext.
> Then the code works.
>
> <!-- Sample XML -->
> <XmlDataProvider x:Key="menuData">
> <x:XData>
> <Items xmlns="">
> <Item Title="Foo..." GroupName="First Group">
> <Item Title="A"/>
> <Item Title="B"/>
> <Item Title="C"/>
> </Item>
> <Item Title="Crimp" GroupName="Another Group" />
> <Item Title="Splange" GroupName="Another Group" />
> <Item Title="Frobnicate..." GroupName="Another One" />
> <Item Title="Do stuff" GroupName="First Group" />
> <Item Title="Mangle" GroupName="First Group" />
> </Items>
> </x:XData>
> </XmlDataProvider>
> ....
> <Menu DataContext="{StaticResource menuData}"/> <!-- if i remove this
> line, then code doesn't work -->
>
>
>
> // Code
> XmlDataProvider xdp = FindResource("menuData") as XmlDataProvider;
> if( xdp.Data == null )
> MessageBox.Show("Data is not loaded");
>
>
> I guess there's some initialized actions for XmlDataProvider by XAML
> intrepreter.
> But I can't find the mappings code or what should I write to let the
> XmlDataProvider works.
>
> Thank you for reading
>
> BR,
>
> HolaMan
>
>

Hi Josh

Thanks for your reply.
I know that all initilization of XAML will be completed after Loaded.
But the key point it that if the XmlDataProvider doesn't link to any
DataContext or Controls at XAMLs, the XmlDataProvider will not be
initlized.

So my question is if I want to use code to initilize, what should I do?

Thanks :-D