Bind combobox elements to data source

Question

I have a combobox which hosts a textblock child element. I want to bind the textblock inside the combobox to a property called ResultList. I tried the code below, but it doesn't work. What have I missed out?

    <ComboBox x:Name="Test" HorizontalAlignment="Left" Margin="79,42,0,0" VerticalAlignment="Top" Width="344" 
              IsEditable="True">
        <ComboBox.Resources>
            <system:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">0</system:Double>
        </ComboBox.Resources>
        <ComboBox.ItemContainerStyle>
            <Style TargetType="{x:Type ComboBoxItem}" >
                <Setter Property="Background" Value="#FFFFFF"/>
                <Setter Property="BorderThickness" Value="0" />
            </Style>
        </ComboBox.ItemContainerStyle>
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Path=ResultList, Mode=OneWay}" DataContext="{Binding Path=ResultList, Mode=OneWay}" />
            </DataTemplate>
        </ComboBox.ItemTemplate>
    </ComboBox>

where is the `ItemsSource` in you `comboBox` ? I guess you will like to bind `ResultList` to `ItemsSource` instead. — Bolu, Sep 16 '13 at 09:55
What object has the `ResultList` property? How is the `DataContext` and/or `ItemsSource` set on the `ComboBox`? — Sheridan, Sep 16 '13 at 09:58
Yes I can bind to ItemSource, and that works, but how do I then bind this my textblock? — friartuck, Sep 16 '13 at 10:02
I assume by its name that `ResultList` is a list of items, so binding it to a text block doesn't make much sense. If what you are trying to do is display each of the items in the comboBox then like other have pointed out you should bind the `ItemsSource` of your `ComboBox`. In Addition, If you are simply just presenting it as plain text, comboBox does it for you and there is no need to use `DataTemplate` ... — Omri Btian, Sep 16 '13 at 10:03
@Prof, do you mean when bind `ItemsSource` to your `comboBox` you don't know what for the `textblock` to bind with? just use `` — Bolu, Sep 16 '13 at 10:09
Yes, I ResultList is a list of items, so I need to bind my combobox itemsource to ResultList, then bind my Textblock to the comboboxes's ItemSource. I tried But that didn't work. Please explain why? — friartuck, Sep 16 '13 at 10:11

score 1 · Accepted Answer · answered Sep 16 '13 at 10:18

1

So, to sum all the comments up:

You need to bind the list to ItemsSource of comboBox.

<ComboBox x:Name="Test" ItemsSrouce="{Binding ResultList}" ....>

And set TextBlock in the ItemTemplate to something like:

<TextBlock Text="{Binding Path=Age}" ..../> 
<TextBlock Text="{Binding Path=Name}" ..../>

answered Sep 16 '13 at 10:18

Bolu

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Yup I actually just worked it out how to do the fields. You don't even need to specify path – friartuck Sep 16 '13 at 10:22
@Prof, Correct, Just personal pereference, that I like to use `Path` in ItemTemplate – Bolu Sep 16 '13 at 10:24
easy peasy. I am impressed this took only about 25 mins to solve. That everyone – friartuck Sep 16 '13 at 10:29

score 0 · Answer 2 · answered Sep 16 '13 at 10:01

You can't set both the DataContext and the Text property to the same value:

"{Binding Path=ResultList, Mode=OneWay}"

You can try this:

<TextBlock Text="{Binding, Mode=OneWay}" DataContext="{Binding Path=ResultList}" />

But this might be better:

<TextBlock Text="{Binding Path=ResultList, Mode=OneWay}" />

Of course, it is hard to answer when you haven't provided all of the necessary information, such as what has been asked in the comments.

Bind combobox elements to data source

2 Answers2

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