CODEWITHSUNDEEP
wpfxamlcomboboxlistboxitemssource
atava
atava

Reputation: 77

DisplayMemberPath not working with direct items?

I have a ListBox (or a ComboBox, I've tried both) where the items are added directly through ListBoxItem (ComboBoxItem) elements.

The data are CultureInfo objects coming from two ObjectDataProvider resources in the element (or in some place above). The CultureInfo.GetCultureInfo static method is called.

In a word, I would like to have a ListBox/ComboBox populated with some CultureInfo entries.

The data binding works fine, but on setting DisplayMemberPath to one of the CultureInfo properties (such as DisplayName - I would like "English" to be displayed, not "en-US") nothing happens. Oddly, if I try with ComboBox and select one of the items, DisplayMemberPath works on the selected value (which is shown in the text box), but not on the dropdown list.

My question is: am I missing something? Or does DisplayMemberPath not work with direct items and only when ItemsSource is bound to a collection (just a guess)?

<ListBox x:Name="LangListBox" DisplayMemberPath="DisplayName">
    <ListBox.Resources>
        <ObjectDataProvider x:Key="EngCultureInfoProvider" ObjectType="{x:Type Globalization:CultureInfo}" MethodName="GetCultureInfo">
            <ObjectDataProvider.MethodParameters>
                <System:String>en-US</System:String>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
        <ObjectDataProvider x:Key="ItaCultureInfoProvider" ObjectType="{x:Type Globalization:CultureInfo}" MethodName="GetCultureInfo">
            <ObjectDataProvider.MethodParameters>
                <System:String>it-IT</System:String>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
    </ListBox.Resources>
    <ListBoxItem Content="{Binding Source={StaticResource EngCultureInfoProvider}}"/>
    <ListBoxItem Content="{Binding Source={StaticResource ItaCultureInfoProvider}}"/>
</ListBox>

ListBox

ComboBox

Note: using ItemTemplate does not work either.

...
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding DisplayName}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
...

Upvotes: 2

Views: 170

Answers (1)

ASh
ASh

Reputation: 35681

Currently each ListBoxItem displays result of ToString() method on CultureInfo object.

DisplayMemberPath and ItemTemplate don't work for items, because ListBoxItem are added directly, not created by ListBox.

Add DisplayName in binding path: 

<ListBoxItem Content="{Binding Source={StaticResource EngCultureInfoProvider}, Path=DisplayName}"/>
<ListBoxItem Content="{Binding Source={StaticResource ItaCultureInfoProvider}, Path=DisplayName}"/>

or

create default Style for ListBoxItem with custom ContentTemplate:

<ListBox x:Name="LangListBox" DisplayMemberPath="DisplayName">
    <ListBox.Resources>
        <Style TargetType="ListBoxItem">
            <Setter Property="ContentTemplate">
                <Setter.Value>
                    <DataTemplate DataType="{x:Type Globalization:CultureInfo}">
                        <TextBlock Text="{Binding DisplayName}"/>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </ListBox.Resources>
    <ListBoxItem Content="{Binding Source={StaticResource EngCultureInfoProvider}}"/>
    <ListBoxItem Content="{Binding Source={StaticResource ItaCultureInfoProvider}}"/>
</ListBox>

Upvotes: 2

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