WPF/VB.NET how to set TabControl Resources Template at runtime

Question

I have built this TabControl

<Window x:Class="_ViewData"...>

<TabControl ItemContainerStyle="{StaticResource TabItemStyleVM}" x:Name="tc" Margin="1" SelectedIndex="0" Height="545"
ItemsSource="{Binding Path=TabItems}"
SelectedItem="{Binding Path=SelectedTabItem}"
IsSynchronizedWithCurrentItem="True">
<TabControl.Resources>
<DataTemplate x:Key="0">
<my:MainControl x:Name="MainControl" DataContext="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}, AncestorLevel=1}, Path=DataContext.MyData}"/>
</DataTemplate>
<DataTemplate x:Key="1">
<my:Details1Control x:Name="Details1Control" DataContext="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}, AncestorLevel=1}, Path=DataContext.MyData}"/>
</DataTemplate>
...
</TabControl.Resources>
</TabControl>
...
</Window>

I wish to set content of <DataTemplate x:Key="2"> at runtime, depending over some condition. Eg:

Public Class _ViewData

Private Sub _DatiGenerali_Loaded(ByVal sender As System.Object, ByVal e As RoutedEventArgs) Handles Me.Loaded
If [user.profile] = "1" Then
[set tc.DataTemplate(1) = "Details1Control.xaml"]
Else
[set tc.DataTemplate(1) = "Details2Control.xaml"]
End If

End Sub
End Class

is there a way to get it?

Answer 1

Hi,@Antonio C . Welcome Microsoft Q&A.
Do you want the following effect? If not, could you show your complete code that reproduces the problem and explain the problem in detail?

 <Window.Resources>  
        <DataTemplate x:Key="Tab1Template">  
            <Grid>  
                <Rectangle Fill="AliceBlue"/>  
                <ContentPresenter Content="{Binding }"/>  
            </Grid>  
        </DataTemplate>  
        <DataTemplate x:Key="Tab2Template">  
            <Grid>  
                <Rectangle Fill="Pink"/>  
                <ContentPresenter Content="{Binding}"/>  
            </Grid>  
        </DataTemplate>  
        <local:TabItemTemplateSelector  x:Key="TabItemTemplateSelector"  Tab1Template="{StaticResource Tab1Template}"  Tab2Template="{StaticResource Tab2Template}" />  
    </Window.Resources>  
    <Grid>  
        <TabControl Name="tb" SelectedIndex="0" ItemsSource="{Binding Tabs}"  ContentTemplateSelector="{StaticResource TabItemTemplateSelector}" >  
        </TabControl>  
  
    </Grid>  

Codebehind:

Public Partial Class MainWindow  
    Inherits Window  
  
    Public Sub New()  
        InitializeComponent()  
        DataContext = New MainVM()  
    End Sub  
End Class  
  
Public Class TabItemVM  
    Public Property Name As String  
  
    Public Overrides Function ToString() As String  
        Return Name  
    End Function  
End Class  
  
Public Class MainVM  
    Public Property Tabs As ObservableCollection(Of TabItemVM)  
  
    Public Sub New()  
        Tabs = New ObservableCollection(Of TabItemVM)() From {  
            New TabItemVM() With {  
                .Name = "Tab1"  
            },  
            New TabItemVM() With {  
                .Name = "Tab2"  
            }  
        }  
    End Sub  
End Class  
  
Public Class TabItemTemplateSelector  
    Inherits DataTemplateSelector  
  
    Public Property Tab1Template As DataTemplate  
    Public Property Tab2Template As DataTemplate  
  
    Public Overrides Function SelectTemplate(ByVal item As Object, ByVal container As DependencyObject) As DataTemplate  
        If item Is Nothing Then Return Nothing  
        Dim tabItem = TryCast(item, TabItemVM)  
        If tabItem.Name = "Tab1" Then Return Tab1Template  
        If tabItem.Name = "Tab2" Then Return Tab2Template  
        Return MyBase.SelectTemplate(item, container)  
    End Function  
End Class  

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