Develop Reference

HeaderedContentControl header template not being used

I'm fairly new to WPF and am working with some legacy code, not sure how to use the HeaderedContentControl Header. I'd like to put in a StackPanel and customize the look of a header, just not sure how to do that.
Could someone give me some guidance on what to do next?
I have this xaml and the HeaderTemplate is never used.
<UserControl x:Class="PEC.Admin.WindowsControls.Program.Views.ProgramProductEnrichmentColorsView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:commonControls="clr-namespace:ManagerConsole.Common.Controls;assembly=ManagerConsole.Common.Controls"
xmlns:program="clr-namespace:PEC.Admin.ViewModel.Program;assembly=PEC.Admin.ViewModel.Program"
mc:Ignorable="d"
d:DesignWidth="300"
d:DataContext="{d:DesignInstance program:ProgramProductEnrichmentColorsViewModel}">
<commonControls:ExpanderPanel IsExpanded="{Binding Path=IsExpanded,Mode=TwoWay}">
<HeaderedContentControl.HeaderTemplate> <!-- this never gets used... -->
<DataTemplate>
<StackPanel>
<Label Content="{Binding Path=Header}"></Label>
</StackPanel>
</DataTemplate>
</HeaderedContentControl.HeaderTemplate>
<StackPanel HorizontalAlignment="Stretch"
VerticalAlignment="Top"
Width="Auto"
Margin="3"
Background="White">
<TextBlock Text="Source Type:"
Margin="0,5,0,0" />
<TextBox IsReadOnly="True"
IsTabStop="False"
Background="LightGray"
BorderThickness="0"
Text="{Binding Path=SourceTypeName, Mode=OneTime}" />
</StackPanel>
</commonControls:ExpanderPanel>
</UserControl>

HeaderTemplate is applied. To verify it - set a background to the Label in HeaderTemplate.
HeaderTemplate doesn't display anything though, because binding is incorrect. Template is applied to the data set in Header property, which currently has null value.
So change code as in the example below (I tried with Expander, hopefully it will work for custom commonControls:ExpanderPanel):
<Expander IsExpanded="{Binding Path=IsExpanded, Mode=TwoWay}"
Header="{Binding ComplexObject}">
<HeaderedContentControl.HeaderTemplate>
<DataTemplate>
<StackPanel>
<Label Background="Green" Content="{Binding PropertyOfTheObject}"/>
</StackPanel>
</DataTemplate>
</HeaderedContentControl.HeaderTemplate>
</Expander>
Header is a dependency property and can be set via Binding. Header becomes a source for bindings in a HeaderTemplate. Or it can be some constant (Header="Click to expand"), resource (Header="{StaticResource ExpandTitle}") or complex content, e.g.:
<Expander.Header>
<TextBlock Text="Click to expand"/>
</Expander.Header>

c# wpf access object defined in references

A simple scenario to show my question:
<Window.Resources>
<DataTemplate x:Key=myTemplate>
<Grid x:Name="myGrid">
<TextBox x:Name="myTextbox" />
</Grid>
</DataTemplate>
<Window.Resources>
<Window>
<Grid x:Name="mainGrid">
<ContentControl x:Name="myContent" Source="{Binding}" ContentTemplate="{StaticResource myTemplate}" />
</Grid>
</Window>
How do I access TextBox 'myTextbox' from C# code?

Use the method
frameworktemplate.FindName where framework element is your data template

How to load usercontrol in Mainwindow in MVVM WPF?

I have a MainWindow.Xaml file. And one usercontrol PatientWindow.Xaml. How to load the patient window in mainwindow in MVVM architecture?
MainWindow.Xaml
<Window x:Class="PatientAdminTool.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:PatientAdminTool.ViewModel"
xmlns:v="clr-namespace:PatientAdminTool.View"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
ResizeMode="CanResizeWithGrip"
WindowStyle="None"
WindowState="Normal"
Title="PatientAdmin Tools"
Height="750"
Width="1400"
AllowsTransparency="True" MouseLeftButtonDown="OnMouseLeftButtonDown" BorderThickness="1" BorderBrush="#555252" >
<WindowChrome.WindowChrome>
<WindowChrome
CaptionHeight="0"
/>
</WindowChrome.WindowChrome>
</Window>
PatientWindow.xaml
Usercontrol window is mentioned in below
<UserControl x:Class="PatientAdminTool.View.PatientWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:vm="clr-namespace:PatientAdminTool.ViewModel"
xmlns:v="clr-namespace:PatientAdminTool.View"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300" >
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<DockPanel Grid.Row="0" LastChildFill="True" Height="40" Background="#646161" >
<StackPanel DockPanel.Dock="Left" Orientation="Horizontal">
<TextBlock Margin=" 10,5,0,0" HorizontalAlignment="Center" Text="Patients" FontSize="16" TextAlignment="Center" VerticalAlignment="Center" Foreground="#FFFFFF"/>
</StackPanel>
<StackPanel Margin="10,10,0,0" DockPanel.Dock="Right" Background="Transparent" Orientation="Vertical" HorizontalAlignment="Right" VerticalAlignment="Top" Width="50" >
<StackPanel Background="Transparent" Orientation="Horizontal" HorizontalAlignment="Right">
<Button Focusable="False" ToolTip="Close" VerticalAlignment="Center" Background="#646161" BorderThickness="0" BorderBrush="Transparent" Padding="-4" Click="Button_Click" >
<Button.Content>
<Grid Width="45" Height="23">
<TextBlock Foreground="White" Text="r" FontFamily="Marlett" FontSize="20" VerticalAlignment="Center" HorizontalAlignment="Center"/>
</Grid>
</Button.Content>
<Button.Template>
<ControlTemplate TargetType="Button">
<ContentPresenter Content="{TemplateBinding Content}"/>
</ControlTemplate>
</Button.Template>
</Button>
</StackPanel>
</StackPanel>
</DockPanel>
</Grid>
</UserControl>
So I need to load the patient window above of main window using MVVM. Here I need to write load event in corresponding View Model. Please help me to do this.

Just add a ControlPresenter at MainWindow.
<ContentPresenter Content="{Binding YouTypeHere}">
<ContentPresenter.Resources>
<DataTemplate DataType="{x:Type fristViewModel1Type}">
<youControlForViewModel1 />
</DataTemplate>
<DataTemplate DataType="{x:Type secondViewModel2Type}">
<youControlForViewModel2 />
</DataTemplate>
</ContentPresenter.Resources>
</ContentPresenter>
And you could change Views via binding different VM to ContentPresenter.

So you want to open a new child window using MVVM? I assume you would open it from MainWindowViewModel.
Solution 1: without strict MVVM
Sometimes its fine to open it directly from the ViewModel:
private void OnOpenPatientWindowCommandExecute()
{
var o = new PatientWindow();
o.ShowDialog();
}
For this you would have to change PatientWindow from UserControl to a Window.
Solution 2: strict MVVM
The solutions following strict MVVM are a little more complex. In the solution I write here you would have to use a Service, add it to your MainWindowViewModel and bind a control from the view to a Command in the ViewModel. Also, its written as if you are using Dependency Injection, that's why you see the service injected in the constructor. You can avoid this by just instantiating the service in the constructor.
MainWindowViewModel.cs
using Prism.Wpf.Commands; // For easy commands
using PatientAdminTool.Services; // Where you put your new service
public class MainWindowViewModel
{
private IShowDialogService _ShowDialogService;
public MainWindowViewModel(IShowDialogService showDialogService)
{
_ShowDialogService = showDialogService;
// Or do: _ShowDialogService = new ShowDialogService();
// But that's not a good practice and won't let you test
// this ViewModel properly.
OpenPatientWindowCommand = new DelegateCommand(OnOpenPatientWindowCommandExecute);
}
public ICommand OpenPatientWindowCommand { get; private set; }
private void OnOpenPatientWindowCommandExecute()
{
_ShowDialogService.ShowPatientWindow();
}
}
Services\IShowDialogService.cs
public interface IShowDialogService
{
void ShowPatientWindow();
void ShowOtherWindow();
// ...
}
Services\ShowDialogService.cs
public class ShowDialogService : IShowDialogService
{
public void ShowPatientWindow()
{
var patientWindowViewModel = new PatientWindowViewModel();
var patientWindow = new PatientWindow();
patientWindow.DataContext = patientWindowViewModel;
patientWindow.ShowDialog();
}
public void ShowOtherWindow()
{
// Other window ...
}
}
Finally, you make the connection in the View like this:
MainWindow.xaml
<Window
xmlns:vm="clr-namespace:PatientAdminTool.ViewModel">
<Window.DataContext>
<vm:MainWindowViewModel/>
</Window.DataContext>
<Grid>
<Button Command="{Binding OpenPatientCommand}">Open Patient</Button>
</Grid>
</Window>
Haven't tried it in Visual Studio yet but that's the idea.

If it's the only thing you are going to be displaying in the same window, just put your view in there like any other control:
<Window x:Class="PatientAdminTool.MainWindow"
xmlns:v="clr-namespace:PatientAdminTool.View"... >
<WindowChrome.WindowChrome>
<WindowChrome
CaptionHeight="0"/>
</WindowChrome.WindowChrome>
<v:PatientWindow/>
</Window>
Do you have a root ViewModel for your window? If so, you can bind to a PatientViewModel:
<v:PatientWindow DataContext="{Binding PatientViewModel}"/>
If not, it's common to set the first DataContext to a ViewModel in the code-behind like this:
<v:PatientWindow Name="PatientWindowView"/>
and:
public partial class Window
{
public MainWindow()
{
InitializeComponent();
PatientWindowView.DataContext = new PatientWindowViewModel();
}
}
If you want to display more than one View, use a ContentPresenter like Shakra has answered.
If you want to open a new window, use what Alberto Cardona López has suggested.

Multiple usercontrol not reflected while setting DataTemplate to ViewModel in MVVM

I am trying to add two usercontrols in one view
usercontrol working fine which get call in constructor i am implementing INotifyPropertyChanged for 'SelectedViewModel'.
property get updated for second usercontrol but not reflected in view .
thanks in advance
<Window x:Class="MovieBookinGWithUserControl.View.StartupWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MovieBookinGWithUserControl.ViewModel"
xmlns:localview ="clr-namespace:MovieBookinGWithUserControl.View"
Title="StartupWindow" Height="AUTo" Width="Auto">
<Window.Resources>
<DataTemplate DataType="{x:Type local:LoginWIndowViewModel}">
<localview:LoginWindow></localview:LoginWindow>
</DataTemplate>
<DataTemplate DataType="{x:Type local:MovieInfoViewModel }">
<localview:MovieInfo ></localview:MovieInfo>
</DataTemplate>
</Window.Resources>
<Grid>
<DockPanel LastChildFill="True">
<StackPanel x:Name="navigation" DockPanel.Dock="Left" Width="Auto">
</StackPanel>
<ContentControl x:Name="Pages" DockPanel.Dock="Right" Content="{Binding SelectedViewModel,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>
</DockPanel>
</Grid>
</Window>

Contentcontrol doesn't find my datatemplate it's ViewModel

I'm using WPF, MVVM & PRISM.
I got a datatemplate in my View linked to a ViewModel UC2002_RFPBeheren_ViewModel cause the page were this code is included is linked to another ViewModel and I want the Button to have UC2002_RFPBeheren_ViewModel as ViewModel.
The datacontext of this page is UC2002_RFPBeheren_ProjectInfo_ViewModel but I want the SaveButton to use the ViewModel UC2002_RFPBeheren_ViewModel
Here is my code:
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../Resources/RFPModuleResources.xaml" />
<ResourceDictionary>
<DataTemplate x:Key="SaveButton" DataType="{x:Type vm:UC2002_RFPBeheren_ViewModel}">
<Button Command="{Binding SaveRFPCommand}">Save</Button>
</DataTemplate>
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
<ContentControl ContentTemplate="{StaticResource SaveButton}"/>
<Button Command="{Binding CloseTabCommand}">Close</Button>
</StackPanel>
Although the SaveButton displays but don't reacts on my command.
Do I forget something or is there another way to solve this?
Thanks in advance ;) !
=================================================================================
EDIT:
So I made some changes but it still doesn't work.
Code example:
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../Resources/RFPModuleResources.xaml" />
<ResourceDictionary>
<DataTemplate x:Key="SaveButton" DataType="{x:Type vm:UC2002_RFPBeheren_ViewModel}">
<Button Command="{Binding SaveRFPCommand}">Save</Button>
</DataTemplate>
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
I set this property in the ViewModel of the page
public UC2002_RFPBeheren_ViewModel MySaveVM { get; set; }
My stackpanel looks now like this:
<StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
<ContentControl Content="{Binding MySaveVM}" ContentTemplate="{StaticResource SaveButton}"/>
<Button Command="{Binding CloseTabCommand}">Close</Button>
</StackPanel>

what happens if you set your UV2002_RFPBeheren_ViewModel instance as the content for the ContentPresenter?
<ContentControl Content="{Binding MyUV2002_RFPBeheren_ViewModel}"/>
the DataTemplate just say how your Viewmodel should be displayed, but you have to set the DataContext or Binding to the instance of your viewmodel.
EDIT:
example
public class VMFoo
{
public UV2002_RFPBeheren_ViewModel MySaveVM {get; set;}
}
xaml
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../Resources/RFPModuleResources.xaml" />
<ResourceDictionary>
<DataTemplate x:Key="SaveButton" DataType="{x:Type vm:UC2002_RFPBeheren_ViewModel}">
<Button Command="{Binding SaveRFPCommand}">Save</Button>
</DataTemplate>
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<UserControl.DataContext>
<x:local VMFoo/>
</UserControl.DataContext>
<StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
<ContentControl Content="{Binding MySaveVM}"/>
<Button Command="{Binding CloseTabCommand}">Close</Button>
</StackPanel>
EDIT: Small working sample
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:WpfApplication1="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<ResourceDictionary>
<DataTemplate DataType="{x:Type WpfApplication1:UV2002_RFPBeheren_ViewModel}">
<Button Command="{Binding SaveRFPCommand}">Save</Button>
</DataTemplate>
</ResourceDictionary>
</Window.Resources>
<Grid>
<Grid.DataContext>
<WpfApplication1:VMFoo/>
</Grid.DataContext>
<StackPanel HorizontalAlignment="Right" Orientation="Horizontal">
<ContentControl Content="{Binding MySaveVM}"/>
<Button Command="{Binding CloseTabCommand}">Close</Button>
</StackPanel>
</Grid>
</Window>
Viewmodels
public class VMFoo
{
public VMFoo()
{
this.MySaveVM = new UV2002_RFPBeheren_ViewModel();
}
public UV2002_RFPBeheren_ViewModel MySaveVM { get; set; }
}
public class UV2002_RFPBeheren_ViewModel
{
private DelegateCommand _save;
public ICommand SaveRFPCommand
{
get{if(this._save==null)
{
this._save = new DelegateCommand(()=>MessageBox.Show("success"),()=>true);
}
return this._save;
}
}
}

This is because of the way that ContentControl's work. It is assumed that the things in the ContentTemplate are related to the Content and so the DataContext is set to the Content and therefore that is the DataContext that the button within the template has access to. You haven't specified a Content so the value is null and so the DataContext is explicitly set to null. You can see this in a basic example. One thing you can do is to bind the Content of the ContentControl to the DataContext - see the last contentcontrol in the example.
<StackPanel DataContext="Foo">
<StackPanel.Resources>
<DataTemplate x:Key="withBtn">
<Button Content="{Binding}" />
</DataTemplate>
</StackPanel.Resources>
<Button Content="{Binding}" />
<ContentControl ContentTemplate="{StaticResource withBtn}" />
<ContentControl Content="{Binding}" ContentTemplate="{StaticResource withBtn}" />
</StackPanel>

If you are using MVVM you must expose some instance of UC2002_RFPBeheren_ViewModel within your UC2002_RFPBeheren_ProjectInfo_ViewModel to bind against. Either as a property, or an item of a collection that is a property.
Everything in the view must be ultimately accessible from the ViewModel that is your data context (UC2002_RFPBeheren_ProjectInfo_ViewModel)