Binding to XPath with prefix in GridViewColumn?

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Jim Hudson - 26 Jul 2007 21:50 GMT

I have a ListView with an ItemSource that is bound to some XML, via {Binding
Xpath=...}. The ListView.View is defined with a GridView. In the individual
GridViewColumn elements, I'd like to specify DisplayMemberBinding, and bind
to the various XML elements. If my XML is specified with the default
namespace, then everyting works like a charm:

<GridViewColumn Header="Name" DisplayMemberBinding="{Binding XPath=name}" />

However, my production XML relies on several namespaces, and so my
production XML element names have a prefix. When I change my XAML code to
use an XmlNamespaceManager, everything ELSE works with the prefixed XPaths,
except for the GridViewColumns. Thus the following:

<GridViewColumn Header="Name" DisplayMemberBinding="{Binding
XPath=cap:name}" />

doesn't work. Found a solution (somewhere on the Internet) that proposed
switching from DisplayMemberBinding to using a CellTemplate, but that didn't
work either.

Any other ideas?

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Jim Hudson

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Walter Wang [MSFT] - 27 Jul 2007 14:20 GMT

Hi Jim,

This is a quick note to let you know that I am performing research on this
issue and will get back to you as soon as possible. I appreciate your
patience.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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Walter Wang [MSFT] - 30 Jul 2007 08:22 GMT

Hi Jim,

I've done some research and following code works on my side:

<Window x:Class="WpfApplication1.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>
<XmlNamespaceMappingCollection x:Key="mapping">
<XmlNamespaceMapping Uri="http://foo" Prefix="foo" />
</XmlNamespaceMappingCollection>

<XmlDataProvider x:Key="Books" Source="Books.xml"
XmlNamespaceManager="{StaticResource mapping}" />
</Window.Resources>
<StackPanel>
<TextBlock>ListView</TextBlock>
<ListView>
<ListView.ItemsSource>
<Binding Source="{StaticResource Books}"
XPath="foo:Books/foo:Book" />
</ListView.ItemsSource>
<ListView.View>
<GridView>
<GridViewColumn Header="Name"
DisplayMemberBinding="{Binding XPath=foo:Name}" />
</GridView>
</ListView.View>
</ListView>
<TextBlock>ListBox</TextBlock>
<ListBox>
<ListBox.ItemsSource>
<Binding Source="{StaticResource Books}"
XPath="foo:Books/foo:Book"/>
</ListBox.ItemsSource>
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding XPath=foo:Name}">
</TextBlock>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>
</Window>

Books.xml

<?xml version="1.0" encoding="utf-8" ?>
<foo:Books xmlns:foo="http://foo">
    <foo:Book>
        <foo:Name>First</foo:Name>
        </foo:Book>
</foo:Books>

Please test this and let me know the result. Thanks.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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Jim Hudson - 03 Aug 2007 21:34 GMT

Your ListView didn't work on my machine. I modified your code, a little, to
make sure that the ListView was doing anything. The modified code is:

<StackPanel>
<TextBlock>ListView</TextBlock>
<ListView ItemsSource="{Binding Source={StaticResource Books},
XPath=foo:Books/foo:Book}" >
<ListView.View>
<GridView>
<GridViewColumn Header="Name1" DisplayMemberBinding="{Binding
XPath=foo:Name}" />
<GridViewColumn Header="Row?" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="A Row" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
<TextBlock>ListBox</TextBlock>
<ListBox ItemsSource="{Binding Source={StaticResource Books},
XPath=foo:Books/foo:Book}" >
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding XPath=foo:Name}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>

I also added 3 more <foo:Book> nodes into Books.xml. When I run the
application, the window looks like this:

----------------------------------------

| ListView
| Name1 Row?
[quoted text clipped - 7 lines]
| Third
| Fourth

----------------------------------

Given that your code works properly on your machine, I have to conclude that
the problem is in the particular release of the .Net 3.0 WPF assemblies
installed on my computer.

Here's where I get a little confused. In my VS2005 project file, the
references for PresentationCore and PresentationFramework both go to dlls in
"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0".
Those DLLs are listed as "Runtime Version v2.0.50727, Version 3.0.0.0".

However, my GAC contains different versions of the same 2 assemblies: the
GAC assemblies are marked as "Product Version 3.0.6912.0 Version 3.0.0.0"
(BTW, I'm doing this testing on a Vista Business 64-bit system).

Have I installed out-of-date copies of the WPF/WCF Framework SDKs?

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Jim Hudson

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Walter Wang [MSFT] - 06 Aug 2007 04:19 GMT

Hi Jim,

After further testing, this looks like an issue of .NET Framework 3.0 but
fixed in .NET Framework 3.5 Beta 2. Please install .NET Framework 3.5 Beta
2 from here:

#Download details: .NET Framework 3.5 Beta 2
http://www.microsoft.com/downloads/details.aspx?familyid=d2f74873-c796-4e60-
91c8-f0ef809b09ee&displaylang=en

We're sorry for the inconvenience caused by this. I'll file a bug for it.

Please note the RTM version of .NET Framework 3.5 is scheduled to be
released at end of 2007; beta 2 of it is also included in VS2008 (aka
Orcas) beta 2, which can be downloaded here:
http://msdn2.microsoft.com/en-us/vstudio/aa700831.aspx

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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Jim Hudson - 06 Aug 2007 13:22 GMT

Thanks for the info, Walter. I'll pass the word about those 2 beta versions
around here at my company.

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Jim Hudson

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Walter Wang [MSFT] - 07 Aug 2007 03:26 GMT

Hi Jim,

Thanks for your quick reply. Please feel free to let me know if you have
any concerns or questions about this issue.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
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that others may learn and benefit from your issue.
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Binding to XPath with prefix in GridViewColumn?

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