I have a Dictionary acting as sort of a phonebook. It uses a character from the alphabet as a key, and an observable collection of classes as the value. These classes include properties like FirstName, LastName, etc...
It looks like this
Dictionary<char,ObservableCollection<NameClass>> NameDictionary
The goal is to be able to use this dictionary as an itemsource for a listbox, and insert the key into the listbox, followed by every NameClass.FirstName that is in the observable collection for that specific key.
This is a stripped-down version DataTemplate I currently have
<DataTemplate x:Key="HeaderTemplate" >
<TextBlock Text="{Binding Key}"/>
<TextBlock Text="{Binding Value}"/>
</DataTemplate>
This is the ListBox that uses the DataTemplate and NameDictionary as a source.
<ListBox x:Name="NameList"
Style="{StaticResource ListStyle}"
ItemContainerStyle="{StaticResource ContainerStyle}"
ItemsPanel="{StaticResource PanelTemplate}"
ItemTemplate="{StaticResource HeaderTemplate}"
ItemsSource="{Binding NameDictionary, IsAsync=True}"
SelectedValue="{Binding ItemIndex}"
SelectedValuePath="Key">
The xaml I currently have will insert the key and ObservableCollection into the Listbox, but I want it to insert all of the items inside of the ObservableCollection, not the collection itself.
For a visual example, I want to make something that looks like this
Char
NameClass.FirstName
NameClass.FirstName
NameClass.FirstName
Char
NameClass.FirstName
NameClass.FirstName
NameClass.FirstName
But what is currently being inserted is this
Char
ObservableCollection
Char
ObservableCollection
Char
ObservableCollection
I would prefer to use xaml for this, and not code behind. I assume this is not too difficult to do, and I will appreciate any help with this.
Your "HeaderTemplate" does not compile because it lacks a panel which hosts multiple elements. Said that, you can modify it to host another ListBox whose ItemsSource to be bound to Value as follows.
<DataTemplate x:Key="HeaderTemplate">
<StackPanel>
<TextBlock Text="{Binding Key}"/>
<ListBox ItemsSource="{Binding Value}">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding FirstName}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>
</DataTemplate>
Related
Let me explain so I have a wpf application I used a listBox with a template. This template contains a TextBlock and a ComboBox. When running the application, everything goes well, my list is initialized correctly. But then I would like to retrieve the values of my TextBlock and my comboBox and I don't understand how I can achieve this.
I am attaching the part of my XAML code that deals with this listBox :
<ListBox x:Name="ListBoxEnv" Grid.Row="1"
d:ItemsSource="{d:SampleData ItemCount=5}" Width="460"
SelectionChanged="ListBoxEnv_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock x:Name="TxtBlockEnv"
VerticalAlignment="Center" HorizontalAlignment="Left"
Text="{Binding EnvName}"/>
<ComboBox x:Name="ComboBoxEnv"
VerticalAlignment="Center" HorizontalAlignment="Left"
ItemsSource="{Binding EnvListValue}"
Margin="100,2,0,2" Width="200"
SelectionChanged="ComboBoxEnv_SelectionChanged"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
The EnvName property is readonly because it is bound to TextBlock, so you can ignore it. Change binding to: Text="{Binding EnvName, Mode=OneTime}" to save the app resources.
However to extract selected environment in every combo in the list you need to add to ComboBox template: SelectedItem={Binding SelectedEnv} and add new property to SampleData
for example
public MyEnvironmentClass SelectedEnv {get; set;}
How can i represent my collection(list) of Attributes when every Attribute contains his name and list of values? Inner lists(values) usually have different lengths. Im using wpf.
I was trying to use DataGrid but cant bind collection properly
You can use ItemsControl with ItemTemplate property set to the DataTemplate with another ItemsControl, like in the following:
> <ItemsControl ItemsSource="{Binding OuterList}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}" />
<ItemsControl ItemsSource="{Binding InnerList}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
I'm trying to organize the items in a combobox into groups. To do this I've created an object that has project and group name strings. I then set the GroupStyle and ItemTemplate to display these values. However, Currently, only the project string is displayed in the combobox (and the box has a red border, indicating some kind of error).
Here's the xaml for my combobox:
<ComboBox x:Name="comboBoxProjects" Margin="165,90,28,0" Grid.Column="0" VerticalAlignment="Top" Height="25"
IsSynchronizedWithCurrentItem="True" SelectedIndex="0" Style="{StaticResource ComboBoxDefault}"
ItemsSource="{Binding Path=ProjectClientSelections.ProjectGroupItems,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding Path=ProjectClientSelections.SelectedProject, UpdateSourceTrigger=PropertyChanged}">
<ComboBox.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<TextBlock Text="{Binding GroupName}"/>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ComboBox.GroupStyle>
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Project}"/>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
Does anyone see where I'm going wrong?
In GroupStyle, the DataContext is not your item (the type contained in your ItemsSource), but a CollectionViewGroup object, which is formed based on the collection of items that you have grouped. Because of this you have to declare a binding path to one of the properties in CollectionViewGroup, for example, based on your code you probably want to use Name property. See MSDN CollectionViewGroup Class
Change your GroupStyle.HeaderTemplate to this:
<DataTemplate>
<TextBlock Text="{Binding Name}" />
</DataTemplate>
You don't show how you have formed your GroupDescriptions. If you have not grouped the items already, you can do it in following way (assuming the XAML you have provided is contained inside Window and Window's and GroupBox's DataContext is the same):
<Window.Resources>
<CollectionViewSource
Source="{Binding ProjectClientSelections.ProjectGroupItems}"
x:Key="GroupedProjectItems">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription
PropertyName="GroupName" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</Window.Resources>
After this change GroupBox ItemSource binding to the following (directly to CollectionViewSource resource):
ItemsSource="{Binding Source={StaticResource GroupedProjectItems}}"
I have a TreeView that looks like this:
<TreeView Grid.Row="1" x:Name="InspectionResultsTreeView"
ItemsSource="{Binding Source={StaticResource InspectionTypeGroupViewSource}, Path=Groups}"
ItemTemplate="{StaticResource InspectionTypeGroupsTemplate}">
</TreeView>
The ItemsSource is a keyed resource that goes by the name of InspectionTypeGroupViewSource:
<CollectionViewSource x:Key="InspectionTypeGroupViewSource" Source="{Binding Results}">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="Inspection.InspectionType" />
<PropertyGroupDescription PropertyName="Inspection" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
The role of this little thing is to take the ViewModel's Results property:
private ObservableCollection<ICodeInspectionResult> _results;
public ObservableCollection<ICodeInspectionResult> Results
{
get { return _results; }
set { _results = value; OnPropertyChanged(); }
}
...and group it on two levels - first by InspectionType, then by Inspection - the result is a 3-level hierarchy with inspection types, inspections, and then individual inspection results. At this point a screenshot might help visualizing I guess:
So, the ItemTemplate of the InspectionResultsTreeView is another keyed resource, by the name of InspectionTypeGroupsTemplate - that's the bold "inspection type" items:
<HierarchicalDataTemplate x:Key="InspectionTypeGroupsTemplate"
DataType="{x:Type CollectionViewGroup}"
ItemsSource="{Binding Items}"
ItemTemplate="{StaticResource InspectionGroupsTemplate}">
<StackPanel Orientation="Horizontal">
<TextBlock VerticalAlignment="Center"
Text="{Binding Name}"
FontWeight="Bold"
TextWrapping="NoWrap"/>
<TextBlock Margin="4,0,4,0"
VerticalAlignment="Center"
Text="{Binding ItemCount, StringFormat=({0})}"
TextWrapping="NoWrap"/>
</StackPanel>
</HierarchicalDataTemplate>
And the ItemTemplate of that template is an InspectionGroupsTemplate - that's the individual inspections, with the "severity" icons:
<HierarchicalDataTemplate x:Key="InspectionGroupsTemplate"
DataType="{x:Type CollectionViewGroup}"
ItemsSource="{Binding Items}"
ItemTemplate="{StaticResource InspectionResultTemplate}">
<StackPanel Orientation="Horizontal">
<Image Style="{StaticResource IconStyle}"
Source="{Binding Name, Converter={StaticResource InspectionIconConverter}}"
VerticalAlignment="Center" />
<TextBlock Margin="4"
VerticalAlignment="Center"
Text="{Binding Name, Converter={StaticResource InspectionDescriptionConverter}}"
TextWrapping="NoWrap"/>
<TextBlock Margin="0,4,0,4"
VerticalAlignment="Center"
Text="{Binding ItemCount, StringFormat=({0})}"
TextWrapping="NoWrap"/>
</StackPanel>
</HierarchicalDataTemplate>
Lastly, the ItemTemplate of this grouping is an InspectionResultTemplate, which is for each individual inspection result:
<DataTemplate x:Key="InspectionResultTemplate"
DataType="{x:Type inspections:ICodeInspectionResult}">
<StackPanel Orientation="Horizontal">
<TextBlock VerticalAlignment="Center"
Margin="4"
Text="{Binding Name}"
TextWrapping="NoWrap"/>
</StackPanel>
</DataTemplate>
The ICodeInspectionResult interface has a string Name property that I'm using here; this Name is different from the Name that's used in the grouping levels, where it's an object CollectionViewGroup.Name - the underlying type of that Name is that of the grouping, so level 1 is an InspectionType, and level 2 is an Inspection.
The problem is that I'm using more converters than I believe I'd need to, to convert this object Name and access the members I need to access and display... but then, I need to display the number of items in each grouping so the DataType ought to be a CollectionViewGroup... right?
How can I do this without resorting to a converter for everything that needs to be displayed? How is this supposed to be done? Every TreeView / CollectionViewGroup tutorial I could find was a trivial implementation.
You've encountered the iconic problem with XAML: it's almost too structured.
The most idiomatic solution is writing a custom WPF User Control. (How and what you include in it is up you.) The goal of the WPF User Control is to eliminate the duplicate XAML markup and logic. You can include your Converter in the User Control, and eliminate the converters from your main control.
There are plenty of tutorials on creating UserControl objects in WPF, so I'll not go into detail here.
As far as the Converter issue: this is almost the most idiomatic way. Each converter is reusable, and focuses only on one source type. There's not much else you can do about it, except consider merging converters that support the same source type together. (There's a reason the converter has a Type targetType parameter, and an object parameter.)
I have a collection that looks like this:
ObservableDictionary<string, ObservableDictionary<string, SystemStatusItem>> ObservableColoServerStatus
I am working on creating a user control that I would like to bind as follows:
Each key (string) key from the outer dictionary should dynamically create an expander.
Inside that expander is a ListView/DataGrid/some control for displaying a collection of information
Each line in the ListView/DataGrid or whatever will be composed of a combination of the (string) Key and a property from the (object)Value of the inner dictionary.
Ideally it should look and operate similarly to a TreeView however Expanders have been widely used through our UI so I would like to stick to this for consistency.
I am new to WPF and have done a bit of basic data binding before but the nature of this nested relationship is making this really difficult to wrap my head around
Ok, first lets asume that you ObservableDictionary is a collection of items that have a Key property and a Value property. What you want can be done in wpf using data templates, please see this code, try do it in this way:
<ListBox ItemsSource="{Binding ObservableColoServerStatus}">
<ListBox.ItemTemplate>
<DataTemplate>
<Expander Header="{Binding Key}">
<ListBox ItemsSource="{Binding Value}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Key}"/>
<TextBlock Text="{Binding Value}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Expander>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
It is a list box, that has as ItemsSource your ObservableDictionary, then in the item template property you set the template that will use for representing all it itmes. In this case an expander, that have in the header the key a list box that take the elements from the Value of the first dictionary, and then you have set the template again. It is similar. Hope it works for you...