TaskbarItemInfo Class
Represents information about how the taskbar thumbnail is displayed.
Assembly: PresentationFramework (in PresentationFramework.dll)
System.Windows.Threading::DispatcherObject
System.Windows::DependencyObject
System.Windows::Freezable
System.Windows.Shell::TaskbarItemInfo
| Name | Description | |
|---|---|---|
![]() | TaskbarItemInfo() | Initializes a new instance of the TaskbarItemInfo class. |
| Name | Description | |
|---|---|---|
![]() | CanFreeze | Gets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.) |
![]() | DependencyObjectType | Gets the DependencyObjectType that wraps the CLR type of this instance. (Inherited from DependencyObject.) |
![]() | Description | Gets or sets the text for the taskbar item tooltip. |
![]() | Dispatcher | Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.) |
![]() | IsFrozen | Gets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.) |
![]() | IsSealed | Gets a value that indicates whether this instance is currently sealed (read-only).(Inherited from DependencyObject.) |
![]() | Overlay | Gets or sets the image that is displayed over the program icon in the taskbar button. |
![]() | ProgressState | Gets or sets a value that indicates how the progress indicator is displayed in the taskbar button. |
![]() | ProgressValue | Gets or sets a value that indicates the fullness of the progress indicator in the taskbar button. |
![]() | ThumbButtonInfos | Gets or sets the collection of ThumbButtonInfo objects that are associated with the Window. |
![]() | ThumbnailClipMargin | Gets or sets a value that specifies the part of the application window's client area that is displayed in the taskbar thumbnail. |
| Name | Description | |
|---|---|---|
![]() | CheckAccess() | Determines whether the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.) |
![]() | ClearValue(DependencyProperty^) | Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.) |
![]() | ClearValue(DependencyPropertyKey^) | Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.) |
![]() | Clone() | |
![]() | CloneCurrentValue() | |
![]() | CoerceValue(DependencyProperty^) | Coerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.(Inherited from DependencyObject.) |
![]() | Equals(Object^) | Determines whether a provided DependencyObject is equivalent to the current DependencyObject.(Inherited from DependencyObject.) |
![]() | Freeze() | |
![]() | GetAsFrozen() | |
![]() | GetCurrentValueAsFrozen() | |
![]() | GetHashCode() | Gets a hash code for this DependencyObject.(Inherited from DependencyObject.) |
![]() | GetLocalValueEnumerator() | Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.) |
![]() | GetType() | |
![]() | GetValue(DependencyProperty^) | Returns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.) |
![]() | InvalidateProperty(DependencyProperty^) | Re-evaluates the effective value for the specified dependency property(Inherited from DependencyObject.) |
![]() | ReadLocalValue(DependencyProperty^) | Returns the local value of a dependency property, if it exists. (Inherited from DependencyObject.) |
![]() | SetCurrentValue(DependencyProperty^, Object^) | Sets the value of a dependency property without changing its value source. (Inherited from DependencyObject.) |
![]() | SetValue(DependencyProperty^, Object^) | Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.) |
![]() | SetValue(DependencyPropertyKey^, Object^) | Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.) |
![]() | ShouldSerializeProperty(DependencyProperty^) | Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.(Inherited from DependencyObject.) |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
![]() | VerifyAccess() | Enforces that the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.) |
| Name | Description | |
|---|---|---|
![]() ![]() | DescriptionProperty | Identifies the Description dependency property. |
![]() ![]() | OverlayProperty | Identifies the Overlay dependency property. |
![]() ![]() | ProgressStateProperty | Identifies the ProgressState dependency property. |
![]() ![]() | ProgressValueProperty | Identifies the ProgressValue dependency property. |
![]() ![]() | ThumbButtonInfosProperty | Identifies the ThumbButtonInfos dependency property. |
![]() ![]() | ThumbnailClipMarginProperty | Identifies the ThumbnailClipMargin dependency property. |
The TaskbarItemInfo class provides a managed wrapper for Windows 7 taskbar functionality. For more information about the Windows shell and native taskbar APIs, see Taskbar Extensions. TaskbarItemInfo is exposed as the Window::TaskbarItemInfo dependency property on a Window.
The Windows 7 taskbar provides enhanced functionality that enables you to use the taskbar item to communicate status to a user and expose common tasks when the window is minimized or hidden. The functionality that is exposed by the TaskbarItemInfo class is unavailable in versions of Windows earlier than Windows 7. Applications that use the TaskbarItemInfo class can still run in earlier versions of Windows; however, these taskbar enhancements are unavailable in the earlier versions.
In Windows 7, some taskbar functionality might be unavailable, depending on the user's settings. For example, taskbar functionality is unavailable if Windows Aero is disabled or if the application is started with elevated permissions. Your application should provide other ways to interact with the user that do not depend on the enhanced taskbar functionality in Windows 7.
Program icons in the notification area, which is at the far right of the taskbar, are typically used to communicate application status to a user. By default, the Windows 7 taskbar hides program icons in the notification area. However, you can set the Overlay property to add an image to the taskbar button to communicate status, such as online status in a messaging application. The overlay image lets users see the application status even if they cannot see the program icon in the notification area. You can also display the progress of running tasks in the taskbar button by setting the ProgressState and ProgressValue properties.
The Windows 7 taskbar displays a thumbnail of the application when you move the mouse pointer over the taskbar button. By default the whole application window is shown. You can specify a particular part of the window to display in the thumbnail by setting the ThumbnailClipMargin property. You can also specify a Description that is displayed in a tooltip above the taskbar thumbnail. The tooltip is displayed even when the thumbnail cannot be seen because of user settings.
You can add buttons to the taskbar thumbnail to provide access to common tasks without switching to the application window. For example, Window Media Player provides Play, Pause, Forward, and Back buttons that let you control media playback from the taskbar thumbnail when the application is minimized. Buttons in the taskbar thumbnail are represented by ThumbButtonInfo objects and are contained in the ThumbButtonInfos collection.
The following illustration shows the enhanced features of the Windows 7 taskbar.

Windows Taskbar Enhanced Features
The following example shows how to create a TaskbarItemInfo in markup. The TaskbarItemInfo contains a collection of ThumbButtonInfo objects that provide access to the Play and Stop commands from the taskbar item.
<Window.TaskbarItemInfo> <TaskbarItemInfo x:Name="taskBarItemInfo1" Overlay="{StaticResource ResourceKey=StopImage}" ThumbnailClipMargin="80,0,80,140" Description="Taskbar Item Info Sample"> <TaskbarItemInfo.ThumbButtonInfos> <ThumbButtonInfoCollection> <ThumbButtonInfo DismissWhenClicked="False" Command="MediaCommands.Play" CommandTarget="{Binding ElementName=btnPlay}" Description="Play" ImageSource="{StaticResource ResourceKey=PlayImage}"/> <ThumbButtonInfo DismissWhenClicked="True" Command="MediaCommands.Stop" CommandTarget="{Binding ElementName=btnStop}" Description="Stop" ImageSource="{StaticResource ResourceKey=StopImage}"/> </ThumbButtonInfoCollection> </TaskbarItemInfo.ThumbButtonInfos> </TaskbarItemInfo> </Window.TaskbarItemInfo>
The following markup and code shows the previous example in its full context. The application uses a BackgroundWorker to count from 0 to 100 and displays its progress in the user interface. The task can be started and stopped from the taskbar preview. The progress is displayed in the taskbar button.
<Window x:Class="Shell_TaskbarItemSample.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="300" Width="300"> <Window.Resources> <DrawingImage x:Key="PlayImage"> <DrawingImage.Drawing> <DrawingGroup> <DrawingGroup.Children> <GeometryDrawing Brush="Green" Geometry="F1 M 50,25L 0,0L 0,50L 50,25 Z "/> </DrawingGroup.Children> </DrawingGroup> </DrawingImage.Drawing> </DrawingImage> <DrawingImage x:Key="StopImage"> <DrawingImage.Drawing> <DrawingGroup> <DrawingGroup.Children> <GeometryDrawing Brush="Gray" Geometry="F1 M 0,0L 50,0L 50,50L 0,50L 0,0 Z "/> </DrawingGroup.Children> </DrawingGroup> </DrawingImage.Drawing> </DrawingImage> </Window.Resources> <Window.CommandBindings> <CommandBinding Command="MediaCommands.Play" Executed="StartCommand_Executed" CanExecute="StartCommand_CanExecute"/> <CommandBinding Command="MediaCommands.Stop" Executed="StopCommand_Executed" CanExecute="StopCommand_CanExecute"/> </Window.CommandBindings> <Window.TaskbarItemInfo> <TaskbarItemInfo x:Name="taskBarItemInfo1" Overlay="{StaticResource ResourceKey=StopImage}" ThumbnailClipMargin="80,0,80,140" Description="Taskbar Item Info Sample"> <TaskbarItemInfo.ThumbButtonInfos> <ThumbButtonInfoCollection> <ThumbButtonInfo DismissWhenClicked="False" Command="MediaCommands.Play" CommandTarget="{Binding ElementName=btnPlay}" Description="Play" ImageSource="{StaticResource ResourceKey=PlayImage}"/> <ThumbButtonInfo DismissWhenClicked="True" Command="MediaCommands.Stop" CommandTarget="{Binding ElementName=btnStop}" Description="Stop" ImageSource="{StaticResource ResourceKey=StopImage}"/> </ThumbButtonInfoCollection> </TaskbarItemInfo.ThumbButtonInfos> </TaskbarItemInfo> </Window.TaskbarItemInfo> <Grid> <StackPanel> <TextBlock x:Name="tbCount" FontSize="72" HorizontalAlignment="Center"/> <StackPanel Orientation="Horizontal"> <Button x:Name="btnPlay" Content="Play" Command="MediaCommands.Play" /> <Button x:Name="btnStop" Content="Stop" Command="MediaCommands.Stop" /> </StackPanel> </StackPanel> </Grid> </Window>
Available since 4.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.





