Change the TextBlock Text present in a DataTemplate

Question

I have a DataTemplate in which I have a Grid layout with 2 RowDefinitions. I have a TextBox in the first row and a ComboBox in the second row.

I have defined the DataTemplate in my ResourceDictionary.

This is the code for the DataTemplate:

<DataTemplate x:Key="myDataTemplate">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>
        <TextBox Name ="txtChannelDescription" Grid.Row="0" Margin="1,1,1,1"/>
        <ComboBox Name="cmbChannelTag" Grid.Row="1" IsReadOnly="True" Margin="1,1,1,1"/>
    </Grid>
</DataTemplate>

I am using this DataTemplate in code behind as:
(DataTemplate)FindResource("myDataTemplate")

How do I set the Value of TextBox.Text and the ItemSource of the ComboBox at runtime? I am using the DataTemplate as template for DataGridTemplateColumn.Header.

Answer 1

Create a custom data type that suits your purpose (with properties named ChannelDescription and ChannelTag in this example) and then bind the values to your DataTemplate :

<DataTemplate x:Key="myDataTemplate" DataType="{x:Type NamespacePrefix:YourDataType}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>
        <TextBox Text="{Binding ChannelDescription}" Grid.Row="0" Margin="1,1,1,1"/>
        <ComboBox ItemsSource="{Binding ChannelTag}" Grid.Row="1" IsReadOnly="True" 
            Margin="1,1,1,1"/>
    </Grid>
</DataTemplate>

It would be used like this:

In your view model, you would have a collection property, lets say called Items :

public ObservableCollection<YourDataType> Items { get; set; }

(Your property should implement the INotifyPropertyChanged interface unlike this one)

In your view, you would have a collection control, lets say a ListBox :

<ListBox ItemsSource="{Binding Items}" ItemTemplate="{StaticResource myDataTemplate}" />

Then each item in the collection control will have the same DataTemplate , but the values would come from the instances of type YourDataType in the Items collection.