With the code below my treeview never populates.
Can anyone see waht I'm doing wrong?
thanks
public class FouList
{
public string Source { get; set; }
public List<FouData> ListOfFou { get; set; }
}
public struct FouData
{
public string Name { get; set; }
}
<Window.Resources>
<HierarchicalDataTemplate DataType="{x:Type local:FouList}"
ItemsSource="{Binding Path=ListOfFou}">
<Border BorderBrush="Black"
BorderThickness="2"
CornerRadius="10">
<TextBlock Margin="10,0,0,0"
Text="{Binding Source}"></TextBlock>
</Border>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type local:FouData}">
<Border BorderBrush="Black"
BorderThickness="2"
CornerRadius="10">
<TextBlock Margin="10,0,0,0"
Text="{Binding Name}"></TextBlock>
</Border>
</HierarchicalDataTemplate>
</Window.Resources>
<TreeView Margin="26,0,35,12" Name="treeView1" Height="298"
ItemsSource="{Binding Path=FouList}" VerticalAlignment="Top"/>
FouList FL = new FouList();
//code to populate FL
//I've debugged and can see it populating correctly
treeView1.DataContext = FL;
ItemsSource binding of treeView1 is incorrect. I suppose you intend to bind to the property ListOfFou, not to FouList.
<TreeView Margin="26,0,35,12" Name="treeView1" Height="298"
ItemsSource="{Binding Path=ListOfFou}" VerticalAlignment="Top"/>
I would try either changing your
List<FouData> ListOfFou { get; set; }
to
ObservableCollection<FouData> ListOfFou { get; set; }
or propagating the change with NotifyPropertyChanged("ListOfFou");
Related
Foreach treeview-item i got an own datagrid. Treeview-items and datagrids are filled by binding.
On textboxes i got a binding to the selected item of the datagrids. But the binding on these textboxes only works with the first datagrid. Every other datagrid doesn't transfer the selecteditem to the textboxes:
Here is the treeview with the datagrid:
<TreeView ItemsSource="{Binding Path=PlaceList}">
<TreeView.ItemTemplate>
<DataTemplate>
<TreeViewItem Header="{Binding Path=Name}">
<DataGrid ItemsSource="{Binding MachinesInPlace, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectionUnit="FullRow"
SelectedItem="{Binding SelectedMachine, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
AutoGenerateColumns="True"
IsSynchronizedWithCurrentItem="True"
SelectionMode="Single">
</DataGrid>
</TreeViewItem>
</DataTemplate>
</TreeView.ItemTemplate>
</TreeView>
Here is the textbox:
<TextBox Text="{Binding PlaceList/SelectedMachine.Name, ValidatesOnDataErrors=True}" />
I am working with MvvmLight. My ViewModel holds the PlaceList:
public ObservableCollection<PlaceModel> PlaceList { get; set; } = new ObservableCollection<PlaceModel>();
public ObjectInspectorViewModel()
{
PlaceList = PlaceModel.GetPlaces(BaseResourcePaths.PlacesCsv);
}
That s my place-model:
public class PlaceModel
{
public int Id { get; set; }
public string Name { get; set; } = "_CurrentObjectName";
public string Length { get; set; }
public string Width { get; set; }
public string Height { get; set; }
public ObservableCollection<MachineModel> MachinesInPlace { get; set; }
public MachineModel SelectedMachine { get; set; }
public static ObservableCollection<PlaceModel> GetPlaces(string filepath)
{
[...]
}
}
I tried something out but at last i dont know how to fix the bug. What s the problem? My suggestion is the property ''SelectedMachine'' inside the place-model...
Here is an example-project (with the additional solution of Sebastian Richter). It shows the problems: https://www.file-upload.net/download-12370581/DatagridTreeViewError.zip.html
I'm quiet sure you forget to implement INotifyPropertyChanged in you class PlaceModel. The problem is after you changed the selection, the Property Placemodel.SelectedMachine will be updated but no event will be fired to populate this change in the View.
Because you use MVVM Light you can derive from ObservableObject which already implements this Interface.
So change your PlaceModel to following code:
public class PlaceModel : ObservableObject
{
private MachineModel _selectedMachine;
public int Id { get; set; }
public string Name { get; set; } = "_CurrentObjectName";
public string Length { get; set; }
public string Width { get; set; }
public string Height { get; set; }
public ObservableCollection<MachineModel> MachinesInPlace { get; set; }
public MachineModel SelectedMachine
{
get
{
return _selectedMachine;
}
set
{
// raises Event PropertyChanged after setting value
Set(ref _selectedMachine, value);
}
}
public static ObservableCollection<PlaceModel> GetPlaces(string filepath)
{
[...]
}
Edit:
I guess the binding doesn't know which element to bind to from your ObservableCollection (many to one relation) because you set it as the reference in your TextBox.
So try to remove the SelectedMachine property from the Model and add it back to the ViewModel:
class ViewModel : ViewModelBase
{
...
private MachineModel _selectedMachine;
public MachineModel SelectedMachine
{
get
{
return _selectedMachine;
}
set
{
// raises Event PropertyChanged after setting value
Set(ref _selectedMachine, value);
}
}
...
}
Also change your XAML to following code (I used your example project):
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="2*"></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<!-- Row #1 -->
<Grid>
<!-- TreeView und DataGrids-->
<TreeView ItemsSource="{Binding Path=PlaceList}">
<TreeView.ItemTemplate>
<DataTemplate>
<TreeViewItem Header="{Binding Path=Name}">
<DataGrid ItemsSource="{Binding MachinesInPlace, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding DataContext.SelectedMachine, RelativeSource={RelativeSource AncestorType=Window},Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
</TreeViewItem>
</DataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Grid>
<!-- Row #2 -->
<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition Width="2*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<Label Grid.Row="0"
Content="ID" />
<!-- Textboxen aktualisieren nur bei Auswahl der ersten Datagrid -->
<TextBox Grid.Column="2"
Grid.Row="0"
Text="{Binding SelectedMachine.Id, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
<Label Grid.Row="1"
Content="Name" />
<TextBox Grid.Column="2"
Grid.Row="1"
Text="{Binding SelectedMachine.Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
</Grid>
</Grid>
The key was to set the correct DataContext for SelectedItem. For this i used following XAML code:
<DataGrid ItemsSource="{Binding MachinesInPlace, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding DataContext.SelectedMachine, RelativeSource={RelativeSource AncestorType=Window},Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
With this the your example project updates the TextBoxes correctly.
I cannot get the View to bind correctly to the ViewModel. When it displays, it only shows the string version of the ViewModel.
I have seen: Setting Window.Content to ViewModel - simple data template not working. But the link is no longer available.
I'm trying to use https://msdn.microsoft.com/en-us/magazine/dd419663.aspx, as a template.
MainWindow.xaml
<Window x:Class="DemoApp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:DemoApp.ViewModel"
xmlns:vw="clr-namespace:DemoApp.View">
<Window.Resources>
<DataTemplate DataType="{x:Type vm:TestViewModel}">
<vw:TestView/>
</DataTemplate>
<DataTemplate x:Key="ClosableTabItemTemplate">
<DockPanel Width="120">
<Button
Command="{Binding Path=CloseCommand}"
Content="X"
Cursor="Hand"
DockPanel.Dock="Right"
VerticalContentAlignment="Bottom"
Width="16" Height="16"/>
<ContentPresenter
Content="{Binding Path=DisplayName}"
VerticalAlignment="Center"/>
</DockPanel>
</DataTemplate>
<DataTemplate x:Key="WorkspacesTemplate">
<TabControl
IsSynchronizedWithCurrentItem="True"
ItemsSource="{Binding}"
ItemTemplate="{StaticResource ClosableTabItemTemplate}"
Margin="4" />
</DataTemplate>
</Window.Resources>
<DockPanel>
<Border
Grid.Column="2"
Style="{StaticResource MainBorderStyle}">
<HeaderedContentControl
Content="{Binding Path=Workspaces}"
ContentTemplate="{StaticResource WorkspacesTemplate}"
Header="Workspaces"
Style="{StaticResource MainHCCStyle}" />
</Border>
</DockPanel>
</Window>
MainWindowViewModel.cs
// ommitted for clarity. This is directing to the view model correctly. It's the binding between View and ViewModel that is not
TestView.xaml
public class TestViewModel : WorkspaceViewModel, INotifyPropertyChanged,
{
public Model.Test _test;
public string DisplayName {get; set;}
public class TestViewModel(Model.Test t)
{
DisplayName = "Test Display Name";
_model = t;
}
// INofifyPropertyChanged Members removed for clarity
}
Test.cs
public class Test
{
public string FirstName {get; set;}
public string LastName {get; set;}
public static DisplayTest()
{
return new Test();
}
}
Displays:
DemoApp.ViewModel.TestViewModel;
However, when I go to the MainWindow.xaml and actually type in into a DockPanel, it will display correctly...
Thank you!!
UPDATE:
MainWindowViewModel.cs Properties
public ReadOnlyCollection<CommandViewModel> Commands
{
get
{
if (_commands == null)
{
List<CommandViewModel> cmds = this.CreateCommands();
_commands = new ReadOnlyCollection<CommandViewModel>(cmds);
}
return _commands;
}
}
public ObservableCollection<WorkspaceViewModel> Workspaces
{
get
{
if (_workspaces == null)
{
_workspaces = new ObservableCollection<WorkspaceViewModel>();
_workspaces.CollectionChanged += this.OnWorkspacesChanged;
}
return _workspaces;
}
}
In the View there was a Data Context Declared. This was confusing the binding it looks like. Once the Data Context in the View was removed and the MainWindowResourses kept the data context, the view is displayed as it should.
How do I wrap or otherwise display long strings in my listview control. I have been unsuccessful in wrapping, or otherwise displaying long text in my bound ListView control. My xaml page is basically a BOUND FlipView with an ItemTemplate that contains two bound textBlocks and a bound ListView. I can get the TextBlocks to wrap but not the listviewitems. It would seem like such a simple thing yet it eludes me.
Here is a portion of my xaml:
<Page.Resources>
<DataTemplate x:DataType="data:MydataObject" x:Key="MydataObjectTemplate">
<StackPanel HorizontalAlignment="Stretch" Height="596" Width="982">
<TextBlock Name="txtDataObjectId" Text="{Binding dataObject.Id}" Visibility="Collapsed" TextWrapping="WrapWholeWords"/>
<TextBlock FontSize="24" Text="{x:Bind dataObject}" HorizontalAlignment="Center" TextWrapping="WrapWholeWords"/>
<ListView ItemsSource ="{x:Bind theObjectDetails, Mode=OneWay }"
HorizontalAlignment="Stretch"
BorderBrush="Black"
BorderThickness="1"/>
</StackPanel>
</DataTemplate>
</Page.Resources>
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<StackPanel HorizontalAlignment="Stretch">
<ComboBox x:Name="cboCategory" Header="Category" SelectionChanged="cboCategory_SelectionChanged" />
<FlipView x:Name="FlipView1"
ItemsSource="{x:Bind MydataObjects, Mode=OneWay }"
ItemTemplate="{StaticResource MydataObjectTemplate}"
BorderBrush="Black"
BorderThickness="1"/>
</StackPanel>
</Grid>
//c#
public class mydataObject
{
public int Id { get; set; }
public dataObject theObject { get; set; }
public List<dataObjectDetails> theObjectDetails { get; set; }
public override string ToString()
{
return this.theObject.Subject;
}
}
public class dataObjectDetails
{
public int Id { get; set; }
public int dodId{ get; set; }
public string bodyText { get; set; }
public override string ToString()
{
return bodyText ;
}
}
Give the ListView an ItemTemplate, which puts the content in a TextBlock that wraps the text:
<ListView
ItemsSource="{x:Bind theObjectDetails, Mode=OneWay}"
HorizontalAlignment="Stretch"
>
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<TextBlock
Text="{Binding bodyText}"
TextWrapping="WrapWholeWords"
/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
I am trying to create an application in which i require to display employees and their departments in the treeview kind of structure as below :
Employee1
Department
Dept1
Dept2
Employee2
Department
Dept3
Dept4
how could i do this with WPF ?
The correct way to do this is to use a HierarchicalDataTemplate. The most basic one I can imagine is the following:
<UserControl.Resources>
<HierarchicalDataTemplate
x:Key="RecursiveData" DataType="TreeViewItem" ItemsSource="{Binding Items}">
</HierarchicalDataTemplate>
</UserControl.Resources>
Which can be used in the XAML as follows:
<TreeView ItemTemplate="{StaticResource RecursiveData}" />
Of course you can customize the template at will with styles and subcomponents.
Note that the ItemSource of your TreeView needs to actually provide nested TreeViewItems where each TreeViewItem contains it's subitems in Items.
If you've structure like this:
public ObservableCollection<ChartOfAccount> ChartOfAccounts { get; set; }
public class ChartOfAccount
{
public Book Book { get; set; }
public List<LedgerHierarchy> ControlLedgers { get; set; }
}
public class LedgerHierarchy
{
public ControlLedger ControlLedger { get; set; }
public ObservableCollection<Ledger> Ledgers { get; set; }
}
you could bind directly in TreeView like this:
<TreeView ItemsSource="{Binding ChartOfAccounts}"
BorderThickness="0"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ItemContainerStyle="{StaticResource treeStyle}">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding ControlLedgers}">
<TextBlock Text="{Binding Book.Name}"/>
<HierarchicalDataTemplate.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Ledgers}">
<TextBlock Text="{Binding ControlLedger.Name}"/>
<HierarchicalDataTemplate.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}"/>
</DataTemplate>
</HierarchicalDataTemplate.ItemTemplate>
</HierarchicalDataTemplate>
</HierarchicalDataTemplate.ItemTemplate>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
instead of creating HierarchicalDataTemplate in Control.Resource.
I have a window MainWindow.xaml and
private static Tutorial tutorial; there.
Also I have class Structure.cs where I describe child types
public class Tutorial
{
public string Name { get; set; }
public IList<Chapter> Chapters = new List<Chapter>();
}
public class Chapter
{
public string Name { get; set; }
public IList<Unit> Units = new List<Unit>();
}
public class Unit
{
public string Name { get; set; }
public IList<Frame> Frames = new List<Frame>();
...
}
I want to bind tutorial structure to treeview. How can I do this?
I tried this way.
<TreeView Grid.Row="2" x:Name="treeViewStruct" Margin="5,0,5,0" Background="LemonChiffon" BorderBrush="Bisque" BorderThickness="1" ScrollViewer.VerticalScrollBarVisibility="Auto" IsTextSearchEnabled="True" Cursor="Hand">
<TreeView.Resources>
<HierarchicalDataTemplate DataType = "{x:Type Structure:Chapter}"
ItemsSource = "{Binding Path=Units}">
<TextBlock Text="{Binding Path=Name}"/>
</HierarchicalDataTemplate>
<DataTemplate DataType="{x:Type Structure:Unit}">
<TextBlock Text="{Binding Path=Name}"/>
</DataTemplate>
</TreeView.Resources>
</TreeView>
It doesn't work.
Please, help! I'm a newbie in WPF. I need dynamic tree
so that when I add a chapter or a unit in the object tutorial, tree is updated.
And for this way of binding please throw the idea how can I get a collection item, when I selected some tree node.
This may help :
<HierarchicalDateTemplate DataType = "{x:Type local:Tutorial}"
ItemsSource="{Binding Chapters}">
<TextBlock Text="{Binding Name}"/>
</HierarchicalDateTemplate>
<HierarchicalDateTemplate DataType = "{x:Type local:Chapter}"
ItemsSource="{Binding Units}"
<TextBlock Text="{Binding Name}"/>
</HierarchicalDateTemplate>
<DateTemplate DataType = "{x:Type local:Unit}"
<TextBlock Text="{Binding Name}"/>
</DateTemplate>