using xml in wpf mvvm - wpf

Question

I have a model
private XmlDataProvider _xmlProvider;
public XmlDataProvider XmlProvider
{
get { return _xmlProvider; }
set { _xmlProvider = value; OnPropertyChanged("XmlProvider"); }
}
in the model constructor i read an xml file
var doc = new System.Xml.XmlDocument();
doc.Load("books.xml");
XmlProvider = new XmlDataProvider()
{
Document = doc,
XPath = #"/root"
};
the xml file only has a root and 1 Element
<proba author="probaauthor"/>
in the viewmodel i have a reference to model
private Model _model;
public Model Model
{
get { return _model; }
set
{
_model = value;
OnPropertyChanged("Model");
}
}
in the view:
xmlns:localMvvmxml="clr-namespace:MvvmSamples.Mvvm.SimpleXml"
<Grid.Resources>
<localMvvmxml:ViewModel x:Key="MyXmlProvider"/>
and below I have a stackpanel with a textbox
<StackPanel Orientation="Horizontal" DataContext="{StaticResource MyXmlProvider}" Margin="5">
<TextBox Text="{Binding XPath=/root/proba/#author}" Width="113"></TextBox>
of course its not working, because i could not reach the provider.
So What to write in the TextBox Binding?
thx.
charlie

Answer 1

I am guessing your View is not bound to your Viewmodel possibly. I am guessing when you are performing the {Binding XPath=(location)} It is not knowing that your view is using a Viewmodel for it's binding.
This may help a little bit keeping in mind the namespace declarations for your code may be different.
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:MvvmSamples.Mvvm.ViewModels"
xmlns:vw="clr-namespace:MvvmSamples.Mvvm.View">
<DataTemplate DataType="{x:Type vm:SimpleXMLViewModel}">
<vw:SimpleXML />
</DataTemplate>
Also keep in mind a good example here for MVVM: http://msdn.microsoft.com/en-us/magazine/dd419663.aspx