I have an xml file that looks something like this
<Data>
<NumberID>23423</NumberID>
<NumberID>34234</NumberID>
<NumberID>45435</NumberID>
</Data>
How do I display a specific node on a textbox control? Currently I'm trying to show the second "NumberID" from my XML file:
<Window.Resources>
<XmlDataProvider x:Key="RoutingData"
Source="/RoutingLogic.xml"
XPath="Data/NumberID[2]"/>
</Window.Resources>
...
<TextBox Text="{Binding ElementName=RoutingData}">
But it's now showing anything. What am I doing wrong?
I figured it out. I changed the binding info to this:
<Window.Resources>
<XmlDataProvider x:Key="RoutingData"
Source="/RoutingLogic.xml"
XPath="Data"/>
</Window.Resources>
...
<TextBox Text="{Binding Source={StaticResource RoutingData}, XPath=NumberID[2]}"/>
Related
I'm having some problems with data binding in XAML and WPF. Specifically, I'm trying to bind data from an XmlDataProvider to a ListBox.
The problem is this, when I'm in design mode in Visual Studio 2010, the xml items show up correctly, but when I run the app the listbox is just empty.
Here is what my xaml looks like. I'm not using any code behind, so this is all there is:
<Window x:Class="WpfTest9_Binding.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="309" Width="622">
<Window.DataContext>
<XmlDataProvider XPath="Servers">
<x:XData>
<Servers>
<Server name="Server01" active="true" />
<Server name="Server02" active="false" />
<Server name="Testserver01" active="true" />
<Server name="Testserver02" active="true" />
</Servers>
</x:XData>
</XmlDataProvider>
</Window.DataContext>
<Grid>
<ListBox ItemsSource="{Binding XPath=*}" Margin="12">
<ListBox.ItemTemplate>
<DataTemplate>
<Border CornerRadius="5" Margin="5" BorderThickness="2" BorderBrush="#FFC14343">
<StackPanel Orientation="Horizontal" Margin="5">
<CheckBox IsChecked="{Binding XPath=#active}" />
<Label Content="{Binding XPath=#name}" />
</StackPanel>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Window>
Like I said above, the strange thing is that it looks like it's working while in design mode, but it fails to fill the listbox when I run the application. I'm not getting any error messages or warnings either.
What's wrong?
Ok, the solution was surprisingly simple.
As pointed out in this post, Listbox content not being populated with content from xml when using XmlDataProvider , all I had to do was to add an empty namespace attribute to the xml element. Like this:
<Servers xmlns="">
<Server name="Server01" active="true" />
<!-- ... -->
</Servers>
I am new to WPF programming. Please help me here.
I want the data entered in textboxes to be updated in the xml file. Here is my code.
xaml:
<Window.Resources>
<XmlDataProvider x:Key="credential_data" Source="Credentials.xml" XPath="/Credentials/MB"/>
</Window.Resources>
<StackPanel DataContext="{Binding Source={StaticResource credential_data}}">
<TextBox Height="23" Name="textBox5" Width="188" Text="{Binding XPath=Hostname, Mode=TwoWay}"/>
<TextBox Height="23" Name="textBox6" Width="188" Text="{Binding XPath=Port, Mode=TwoWay}"/>
</StackPanel>
Here is Credentials.xml :
<?xml version="1.0" encoding="utf-8"?>
<Credentials>
<MB>
<Hostname>10.111.123.234</Hostname>
<Port>8080</Port>
</MB>
</Credentials>
What is happening now is that any updates in the xml file gets reflected in the textboxes but any changes in textbox.text does not update the xml file.
where am I going wrong?? :(
Thanks.
Sorry for not giving you a full example, but this CodeProject already has a tutorial project that does exactly what you want
I have a UI in a window, which is bound to an XML file. I need to update the UI whenever I manually go and change my XML file.
Following is the WAML file:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<XmlDataProvider x:Key="dataSource" Source="Data/Media.xml">
</XmlDataProvider>
</Window.Resources>
<Grid>
<ListBox Name="listBox1" DataContext="{Binding Source={StaticResource dataSource}, XPath=/Media/Book/#Title, Mode=OneWay}" />
</Grid>
</Window>
The following is the XML file:
<?xml version="1.0" encoding="utf-8" ?>
<Media>
<Book Author='John' Title='Fish are my aaaa friends' />
<Book Author='Dave' Title='Fish are my enemies' />
<Book Author='Jane' Title='Fish are my food' />
</Media>
I have a window object in the service layer. To initialise it, I did the following:
winobj.DataContext = node.OuterXml; winobj.Show(); where node is my XML string which I get from the server. If I ask you to update this winobj or reset its datacontext so that the UI is updated, how will you do it?
My UI is bound in the following way.
<Window.Resources>
<XmlDataProvider x:Key="Data" XPath="//WindowUpdate" />
</Window.Resources>
<Label Content="{Binding Source={StaticResource Data},
XPath=Window/Children/Label[#id\=\'lblInterval\']/#text}" ...
You could use a FileSystemWatcher to catch changes to the file, how you change the data is up to you (e.g. expose a bindable property and change that).
Sorry for this, I've just started programming with wpf. I can't seem to figure out why the following xaml displays "System.Xml.XmlElement" instead of the actual xml node content. This is displayed 5 times in the listbox whenever I run it. Not sure where I'm going wrong...
<Window x:Class="TestBinding.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Window.Resources>
<XmlDataProvider x:Key="myXmlSource" XPath="/root">
<x:XData>
<root xmlns="">
<name>Steve</name>
<name>Arthur</name>
<name>Sidney</name>
<name>Billy</name>
<name>Steven</name>
</root>
</x:XData>
</XmlDataProvider>
<DataTemplate x:Key="shmooga">
<TextBlock Text="{Binding}"/>
</DataTemplate>
</Window.Resources>
<Grid>
<ListBox ItemTemplate="{StaticResource shmooga}"
ItemsSource="{Binding Source={StaticResource myXmlSource}, XPath=name}">
</ListBox>
</Grid>
</Window>
Any help would be very much appreciated. Thanks!
Your ItemsSource Binding is returning the collection of 'name' elements. These are of type XmlElement. This is done because it allows bindings to get at other properties of the XmlElement, but means that if you textually display the result of the binding then you get System.Xml.XmlElement rather than the textual content.
To get the textual content, add an additional XPath to your ItemTemplate binding to specify that the TextBlock.Text property should bind specifically to the text of the element, not the element object itself:
<DataTemplate x:Key="shmooga">
<TextBlock Text="{Binding XPath=text()}"/> <!-- Note XPath on Binding -->
</DataTemplate>
Is it possible to bind something to a property of a control in a data template entirely in XAML? The following code is a simplified version of the problem I'm running into. I'd like the text of the TextBlock (displayName) to be updated as the user types in the TextBox located in the DataTemplate.
<Window x:Class="WpfApplication4.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:WpfApplication4="clr-namespace:WpfApplication4"
Title="Window1" Height="300" Width="300">
<Window.Resources>
<DataTemplate DataType="{x:Type WpfApplication4:Foo}">
<TextBox Text="{Binding Path=Name}" />
</DataTemplate>
<WpfApplication4:Foo x:Key="testObject" Name="This is a test" />
</Window.Resources>
<StackPanel>
<TextBlock x:Name="displayName" Margin="5" />
<ContentControl x:Name="contentControl" Margin="5" Content="{StaticResource testObject}" />
</StackPanel>
No, at least, not from XAML. You could write code to traverse the visual tree and find the element you want to bind to, but that would be nasty.
But in your particular example, would it not make sense to just bind the TextBlock to the same data object (Foo instance)?