How to binding combobox with Dictionary ?

Question

My data source definition as below. Type of FinincialNewsCategories is Dictionary<string, string>

<UserControl.Resources>
        <CollectionViewSource
            x:Name="financialNewsCategoriesViewSource"
            Source="{Binding FinancialNewsCategories}"
            IsSourceGrouped="False"
            d:Source="{Binding FinancialNewsCategories, Source={d:DesignInstance Type=vm:FinancialNewsGroupItemsViewModel, IsDesignTimeCreatable=True}}"/>
    </UserControl.Resources>

And my comboBox binding

<ComboBox x:Name="FinancialNewsCategoryComboBox"
                      DisplayMemberPath="Value"
                      ItemsSource="{Binding Source={StaticResource financialNewsCategoriesViewSource}, Mode=OneWay}"
                      SelectedItem="{Binding SelectedValue, Mode=TwoWay}" />

I have two questions

1. this xaml works fine at Designtime, but shows nothing at Runtime. why ? (If I remove DisplayMemberPath="Value" then I will see type string at runtime)
2. Onece I add SelectedValuePath(for example: SelectedValuePath = "Key") then nothing will show both DesignTime and Runtime. So when and how to use SelectedValuePath attribute ?

I have searched the internet and find many WPF solution to this problem. but nothing works.

Answer 1

Do you mind sending a working reproduction app to me?  MSMALL at Microsoft.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

Answer 2

Hi~ OK~ I'll send you my solution.
(sent from PONPON66 at hotmail  and title as SourceCode)

thanks for your help.

Answer 3

Hi Matt,

Did you receive my mail ?

Answer 4

Yes, I will look at this today.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

Answer 5

I was able to reproduce this on RP but not on RTM bits.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.