Wpf drop down list

Wpf drop down list DEFAULT

WPF - Combobox



A combobox is a selection control that combines a non-editable textbox and a drop-down listbox that allows users to select an item from a list. It either displays the current selection or is empty if there is no selected item. The hierarchical inheritance of ComboBox class is as follows −

Hierarchical of Combobox

Commonly Used Properties of ComboBox

Sr.No.Property & Description
1

Background

Gets or sets a brush that provides the background of the control. (Inherited from Control)

2

BorderThickness

Gets or sets the border thickness of a control. (Inherited from Control)

3

FontFamily

Gets or sets the font used to display text in the control. (Inherited from Control)

4

FontSize

Gets or sets the size of the text in this control. (Inherited from Control)

5

FontStyle

Gets or sets the style in which the text is rendered. (Inherited from Control)

6

FontWeight

Gets or sets the thickness of the specified font. (Inherited from Control)

7

Foreground

Gets or sets a brush that describes the foreground color. (Inherited from Control)

8

GroupStyle

Gets a collection of GroupStyle objects that define the appearance of each level of groups. (Inherited from ItemsControl)

9

Header

Gets or sets the content for the control's header.

10

Height

Gets or sets the suggested height of a FrameworkElement. (Inherited from FrameworkElement)

11

HorizontalAlignment

Gets or sets the horizontal alignment characteristics that are applied to a FrameworkElement when it is composed in a layout parent, such as a panel or items control. (Inherited from FrameworkElement)

12

IsDropDownOpen

Gets or sets a value that indicates whether the drop-down portion of the ComboBox is currently open.

13

IsEditable

Gets a value that indicates whether the user can edit text in the text box portion of the ComboBox. This property always returns false.

14

IsEnabled

Gets or sets a value indicating whether the user can interact with the control. (Inherited from Control)

15

Margin

Gets or sets the outer margin of a FrameworkElement. (Inherited from FrameworkElement)

16

Name

Gets or sets the identifying name of the object. When a XAML processor creates the object tree from XAML markup, run-time code can refer to the XAML-declared object by this name. (Inherited from FrameworkElement)

17

Opacity

Gets or sets the degree of the object's opacity. (Inherited from UIElement)

18

SelectedIndex

Gets or sets the index of the selected item. (Inherited from Selector)

19

SelectedItem

Gets or sets the selected item. (Inherited from Selector)

20

SelectedValue

Gets or sets the value of the selected item, obtained by using the SelectedValuePath. (Inherited from Selector)

21

Style

Gets or sets an instance Style that is applied for this object during layout and rendering. (Inherited from FrameworkElement)

22

VerticalAlignment

Gets or sets the vertical alignment characteristics that are applied to a FrameworkElement when it is composed in a parent object such as a panel or items control. (Inherited from FrameworkElement)

23

Width

Gets or sets the width of a FrameworkElement. (Inherited from FrameworkElement)

24

ItemsSource

Gets or sets an object source used to generate the content of the ItemsControl. (Inherited from ItemsControl)

Commonly Used Methods of ComboBox

Sr.No.Method & Description
1

Arrange

Positions child objects and determines a size for a UIElement. Parent objects that implement custom layout for their child elements should call this method from their layout override implementations to form a recursive layout update. (Inherited from UIElement)

2

FindName

Retrieves an object that has the specified identifier name. (Inherited from FrameworkElement)

3

Focus

Attempts to set the focus on the control. (Inherited from Control)

4

GetValue

Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject)

5

IndexFromContainer

Returns the index to the item that has the specified, generated container. (Inherited from ItemsControl)

6

OnDragEnter

Called before the DragEnter event occurs. (Inherited from Control)

7

OnDragLeave

Called before the DragLeave event occurs. (Inherited from Control)

8

OnDragOver

Called before the DragOver event occurs. (Inherited from Control)

9

OnDrop

Called before the Drop event occurs. (Inherited from Control)

10

OnKeyDown

Called before the KeyDown event occurs. (Inherited from Control)

11

OnKeyUp

Called before the KeyUp event occurs. (Inherited from Control)

12

OnLostFocus

Called before the LostFocus event occurs. (Inherited from Control)

13

ReadLocalValue

Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject)

14

SetBinding

Attaches a binding to a FrameworkElement, using the provided binding object. (Inherited from FrameworkElement)

15

SetValue

Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject)

Commonly Used Events of ComboBox

Sr.No.Event & Description
1

DragEnter

Occurs when the input system reports an underlying drag event with this element as the target. (Inherited from UIElement)

2

DragLeave

Occurs when the input system reports an underlying drag event with this element as the origin. (Inherited from UIElement)

3

DragOver

Occurs when the input system reports an underlying drag event with this element as the potential drop target. (Inherited from UIElement)

4

DragStarting

Occurs when a drag operation is initiated. (Inherited from UIElement)

5

Drop

Occurs when the input system reports an underlying drop event with this element as the drop target. (Inherited from UIElement)

6

DropCompleted

Occurs when a drag-and-drop operation is ended. (Inherited from UIElement)

7

DropDownClosed

Occurs when the drop-down portion of the ComboBox closes.

8

DropDownOpened

Occurs when the drop-down portion of the ComboBox opens.

9

GotFocus

Occurs when a UIElement receives focus. (Inherited from UIElement)

10

IsEnabledChanged

Occurs when the IsEnabled property changes. (Inherited from Control)

11

KeyDown

Occurs when a keyboard key is pressed while the UIElement has focus. (Inherited from UIElement)

12

KeyUp

Occurs when a keyboard key is released while the UIElement has focus. (Inherited from UIElement)

13

LostFocus

Occurs when a UIElement loses focus. (Inherited from UIElement)

14

SelectionChanged

Occurs when the currently selected item changes. (Inherited from Selector)

15

SizeChanged

Occurs when either the ActualHeight or the ActualWidth property changes value on a FrameworkElement. (Inherited from FrameworkElement)

Example

  • Let’s create a new WPF project with the name WPFComboBoxControl.

  • Drag two comboboxes and two textboxes from a toolbox and set the following properties in the properties window.

ControlsPropertyValue
Combobox1isEditableFalse
NamecomboBox
Width90
Combobox2isEditableTrue
NamecomboBox1
Width90
Textbox1NametextBox
Width300
Textbox2NametextBox1
Width300
  • Now switch to XAML window in which you will see the XAML tags for comboboxes and textboxes.

  • Add some more properties combobox items and selection event, as shown in the following XAML code.

<Window x:Class = "WPFComboBoxControl.MainWindow" xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d = "http://schemas.microsoft.com/expression/blend/2008" xmlns:mc = "http://schemas.openxmlformats.

Here is the C# code in which the selection changed events are implemented.

using System.Windows; using System.Windows.Controls; namespace WPFComboBoxControl { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void Combo_SelectionChanged(object sender, SelectionChangedEventArgs e) { textBox.Text = comboBox.SelectedItem.ToString(); } private void Combo1_SelectionChanged(object sender, SelectionChangedEventArgs e) { textBox1.Text = comboBox1.SelectedItem.ToString(); } } }

When you compile and execute the above code, it will produce the following window. When you select an item, it will be displayed on the textbox.

select an item

We recommend that you execute the above example code and try some other properties and events of the combobox control.

wpf_controls.htm

Sours: https://www.tutorialspoint.com/wpf/wpf_combobox.htm

The ComboBox control

List controls:

The ComboBox control is in many ways like the ListBox control, but takes up a lot less space, because the list of items is hidden when not needed. The ComboBox control is used many places in Windows, but to make sure that everyone knows how it looks and works, we'll jump straight into a simple example:

In the screenshot, I have activated the control by clicking it, causing the list of items to be displayed. As you can see from the code, the ComboBox, in its simple form, is very easy to use. All I've done here is manually add some items, making one of them the default selected item by setting the IsSelected property on it.

Custom content

In the first example we only showed text in the items, which is pretty common for the ComboBox control, but since the ComboBoxItem is a ContentControl, we can actually use pretty much anything as content. Let's try making a slightly more sophisticated list of items:

For each of the ComboBoxItem's we now add a StackPanel, in which we add an Image and a TextBlock. This gives us full control of the content as well as the text rendering, as you can see from the screenshot, where both text color and image indicates a color value.

Data binding the ComboBox

As you can see from the first examples, manually defining the items of a ComboBox control is easy using XAML, but you will likely soon run into a situation where you need the items to come from some kind of data source, like a database or just an in-memory list. Using WPF data binding and a custom template, we can easily render a list of colors, including a preview of the color:

It's actually quite simple: In the Code-behind, I obtain a list of all the colors using a Reflection based approach with the Colors class. I assign it to the ItemsSource property of the ComboBox, which then renders each color using the template I have defined in the XAML part.

Each item, as defined by the ItemTemplate, consists of a StackPanel with a Rectangle and a TextBlock, each bound to the color value. This gives us a complete list of colors, with minimal effort - and it looks pretty good too, right?

IsEditable

In the first examples, the user was only able to select from our list of items, but one of the cool things about the ComboBox is that it supports the possibility of letting the user both select from a list of items or enter their own value. This is extremely useful in situations where you want to help the user by giving them a pre-defined set of options, while still giving them the option to manually enter the desired value. This is all controlled by the IsEditable property, which changes the behavior and look of the ComboBox quite a bit:

As you can see, I can enter a completely different value or pick one from the list. If picked from the list, it simply overwrites the text of the ComboBox.

As a lovely little bonus, the ComboBox will automatically try to help the user select an existing value when the user starts typing, as you can see from the next screenshot, where I just started typing "Co":

By default, the matching is not case-sensitive but you can make it so by setting the IsTextSearchCaseSensitive to True. If you don't want this auto complete behavior at all, you can disable it by setting the IsTextSearchEnabled to False.

Working with ComboBox selection

A key part of using the ComboBox control is to be able to read the user selection, and even control it with code. In the next example, I've re-used the data bound ComboBox example, but added some buttons for controlling the selection. I've also used the SelectionChanged event to capture when the selected item is changed, either by code or by the user, and act on it.

Here's the sample:

The interesting part of this example is the three event handlers for our three buttons, as well as the SelectionChanged event handler. In the first two, we select the previous or the next item by reading the SelectedIndex property and then subtracting or adding one to it. Pretty simple and easy to work with.

In the third event handler, we use the SelectedItem to select a specific item based on the value. I do a bit of extra work here (using .NET reflection), because the ComboBox is bound to a list of properties, each being a color, instead of a simple list of colors, but basically it's all about giving the value contained by one of the items to the SelectedItem property.

In the fourth and last event handler, I respond to the selected item being changed. When that happens, I read the selected color (once again using Reflection, as described above) and then use the selected color to create a new background brush for the Window. The effect can be seen on the screenshot.

If you're working with an editable ComboBox (IsEditable property set to true), you can read the Text property to know the value the user has entered or selected.

This article has been fully translated into the following languages: Is your preferred language not on the list? Click hereto help us translate this article into your language!

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Sours: https://www.wpf-tutorial.com/list-controls/combobox-control/
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ComboBox Class

AddChild(Object)

Adds the specified object as the child of the ItemsControl object.

(Inherited from ItemsControl) AddHandler(RoutedEvent, Delegate)

Adds a routed event handler for a specified routed event, adding the handler to the handler collection on the current element.

(Inherited from UIElement) AddHandler(RoutedEvent, Delegate, Boolean)

Adds a routed event handler for a specified routed event, adding the handler to the handler collection on the current element. Specify as to have the provided handler be invoked for routed event that had already been marked as handled by another element along the event route.

(Inherited from UIElement) AddLogicalChild(Object)

Adds the provided object to the logical tree of this element.

(Inherited from FrameworkElement) AddText(String)

Adds the specified text string to the ItemsControl object.

(Inherited from ItemsControl) AddToEventRoute(EventRoute, RoutedEventArgs)

Adds handlers to the specified EventRoute for the current UIElement event handler collection.

(Inherited from UIElement) AddVisualChild(Visual)

Defines the parent-child relationship between two visuals.

(Inherited from Visual) ApplyAnimationClock(DependencyProperty, AnimationClock)

Applies an animation to a specified dependency property on this element. Any existing animations are stopped and replaced with the new animation.

(Inherited from UIElement) ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)

Applies an animation to a specified dependency property on this element, with the ability to specify what happens if the property already has a running animation.

(Inherited from UIElement) ApplyTemplate()

Builds the current template's visual tree if necessary, and returns a value that indicates whether the visual tree was rebuilt by this call.

(Inherited from FrameworkElement) Arrange(Rect)

Positions child elements and determines a size for a UIElement. Parent elements call this method from their ArrangeCore(Rect) implementation (or a WPF framework-level equivalent) to form a recursive layout update. This method constitutes the second pass of a layout update.

(Inherited from UIElement) ArrangeCore(Rect)

Implements ArrangeCore(Rect) (defined as virtual in UIElement) and seals the implementation.

(Inherited from FrameworkElement) ArrangeOverride(Size)

Called to arrange and size the content of a Control object.

(Inherited from Control) BeginAnimation(DependencyProperty, AnimationTimeline)

Starts an animation for a specified animated property on this element.

(Inherited from UIElement) BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)

Starts a specific animation for a specified animated property on this element, with the option of specifying what happens if the property already has a running animation.

(Inherited from UIElement) BeginInit()

Indicates that the initialization of the ItemsControl object is about to start.

(Inherited from ItemsControl) BeginStoryboard(Storyboard)

Begins the sequence of actions that are contained in the provided storyboard.

(Inherited from FrameworkElement) BeginStoryboard(Storyboard, HandoffBehavior)

Begins the sequence of actions contained in the provided storyboard, with options specified for what should happen if the property is already animated.

(Inherited from FrameworkElement) BeginStoryboard(Storyboard, HandoffBehavior, Boolean)

Begins the sequence of actions contained in the provided storyboard, with specified state for control of the animation after it is started.

(Inherited from FrameworkElement) BringIntoView()

Attempts to bring this element into view, within any scrollable regions it is contained within.

(Inherited from FrameworkElement) BringIntoView(Rect)

Attempts to bring the provided region size of this element into view, within any scrollable regions it is contained within.

(Inherited from FrameworkElement) CaptureMouse()

Attempts to force capture of the mouse to this element.

(Inherited from UIElement) CaptureStylus()

Attempts to force capture of the stylus to this element.

(Inherited from UIElement) CaptureTouch(TouchDevice)

Attempts to force capture of a touch to this element.

(Inherited from UIElement) CheckAccess()

Determines whether the calling thread has access to this DispatcherObject.

(Inherited from DispatcherObject) ClearContainerForItemOverride(DependencyObject, Object)

Returns an item container to the state it was in before PrepareContainerForItemOverride(DependencyObject, Object).

(Inherited from Selector) 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) 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) ContainerFromElement(DependencyObject)

Returns the container that belongs to the current ItemsControl that owns the given element.

(Inherited from ItemsControl) EndInit()

Indicates that the initialization of the ItemsControl object is complete.

(Inherited from ItemsControl) Equals(Object)

Determines whether a provided DependencyObject is equivalent to the current DependencyObject.

(Inherited from DependencyObject) FindCommonVisualAncestor(DependencyObject)

Returns the common ancestor of two visual objects.

(Inherited from Visual) FindName(String)

Finds an element that has the provided identifier name.

(Inherited from FrameworkElement) FindResource(Object)

Searches for a resource with the specified key, and throws an exception if the requested resource is not found.

(Inherited from FrameworkElement) Focus()

Attempts to set focus to this element.

(Inherited from UIElement) GetAnimationBaseValue(DependencyProperty)

Returns the base property value for the specified property on this element, disregarding any possible animated value from a running or stopped animation.

(Inherited from UIElement) GetBindingExpression(DependencyProperty)

Returns the BindingExpression that represents the binding on the specified property.

(Inherited from FrameworkElement) GetContainerForItemOverride()

Creates or identifies the element used to display the specified item.

GetHashCode()

Gets a hash code for this DependencyObject.

(Inherited from DependencyObject) GetLayoutClip(Size)

Returns a geometry for a clipping mask. The mask applies if the layout system attempts to arrange an element that is larger than the available display space.

(Inherited from FrameworkElement) GetLocalValueEnumerator()

Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject.

(Inherited from DependencyObject) GetTemplateChild(String)

Returns the named element in the visual tree of an instantiated ControlTemplate.

(Inherited from FrameworkElement) GetType()

Gets the Type of the current instance.

(Inherited from Object) GetUIParentCore()

Returns an alternative logical parent for this element if there is no visual parent.

(Inherited from FrameworkElement) GetValue(DependencyProperty)

Returns the current effective value of a dependency property on this instance of a DependencyObject.

(Inherited from DependencyObject) GetVisualChild(Int32)

Overrides GetVisualChild(Int32), and returns a child at the specified index from a collection of child elements.

(Inherited from FrameworkElement) HitTestCore(GeometryHitTestParameters)

Implements HitTestCore(GeometryHitTestParameters) to supply base element hit testing behavior (returning GeometryHitTestResult).

(Inherited from UIElement) HitTestCore(PointHitTestParameters)

Implements HitTestCore(PointHitTestParameters) to supply base element hit testing behavior (returning HitTestResult).

(Inherited from UIElement) InputHitTest(Point)

Returns the input element within the current element that is at the specified coordinates, relative to the current element's origin.

(Inherited from UIElement) InvalidateArrange()

Invalidates the arrange state (layout) for the element. After the invalidation, the element will have its layout updated, which will occur asynchronously unless subsequently forced by UpdateLayout().

(Inherited from UIElement) InvalidateMeasure()

Invalidates the measurement state (layout) for the element.

(Inherited from UIElement) InvalidateProperty(DependencyProperty)

Re-evaluates the effective value for the specified dependency property.

(Inherited from DependencyObject) InvalidateVisual()

Invalidates the rendering of the element, and forces a complete new layout pass. OnRender(DrawingContext) is called after the layout cycle is completed.

(Inherited from UIElement) IsAncestorOf(DependencyObject)

Determines whether the visual object is an ancestor of the descendant visual object.

(Inherited from Visual) IsDescendantOf(DependencyObject)

Determines whether the visual object is a descendant of the ancestor visual object.

(Inherited from Visual) IsItemItsOwnContainer(Object)

Determines if the specified item is (or is eligible to be) its own container.

(Inherited from ItemsControl) IsItemItsOwnContainerOverride(Object)

Determines if the specified item is (or is eligible to be) its own .

Measure(Size)

Updates the DesiredSize of a UIElement. Parent elements call this method from their own MeasureCore(Size) implementations to form a recursive layout update. Calling this method constitutes the first pass (the "Measure" pass) of a layout update.

(Inherited from UIElement) MeasureCore(Size)

Implements basic measure-pass layout system behavior for FrameworkElement.

(Inherited from FrameworkElement) MeasureOverride(Size)

Called to remeasure a control.

(Inherited from Control) MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object) MoveFocus(TraversalRequest)

Moves the keyboard focus away from this element and to another element in a provided traversal direction.

(Inherited from FrameworkElement) OnAccessKey(AccessKeyEventArgs)

Provides class handling for when an access key that is meaningful for this element is invoked.

(Inherited from UIElement) OnAlternationCountChanged(Int32, Int32)

Invoked when the AlternationCount property changes.

(Inherited from ItemsControl) OnApplyTemplate()

Called when ApplyTemplate() is called.

OnChildDesiredSizeChanged(UIElement)

Supports layout behavior when a child element is resized.

(Inherited from UIElement) OnContextMenuClosing(ContextMenuEventArgs)

Invoked whenever an unhandled ContextMenuClosing routed event reaches this class in its route. Implement this method to add class handling for this event.

(Inherited from FrameworkElement) OnContextMenuOpening(ContextMenuEventArgs)

Invoked whenever an unhandled ContextMenuOpening routed event reaches this class in its route. Implement this method to add class handling for this event.

(Inherited from FrameworkElement) OnCreateAutomationPeer()

Provides an appropriate ComboBoxAutomationPeer implementation for this control, as part of the WPF infrastructure.

OnDisplayMemberPathChanged(String, String)

Invoked when the DisplayMemberPath property changes.

(Inherited from ItemsControl) OnDpiChanged(DpiScale, DpiScale)

Called when the DPI at which this View is rendered changes.

(Inherited from Visual) OnDragEnter(DragEventArgs)

Invoked when an unhandled DragEnter attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.

(Inherited from UIElement) OnDragLeave(DragEventArgs)

Invoked when an unhandled DragLeave attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.

(Inherited from UIElement) OnDragOver(DragEventArgs)

Invoked when an unhandled DragOver attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.

(Inherited from UIElement) OnDrop(DragEventArgs)

Invoked when an unhandled DragEnter attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.

(Inherited from UIElement) OnDropDownClosed(EventArgs)

Reports when a combo box's popup closes.

OnDropDownOpened(EventArgs)

Reports when a combo box's popup opens.

OnGiveFeedback(GiveFeedbackEventArgs)

Invoked when an unhandled GiveFeedback attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.

(Inherited from UIElement) OnGotFocus(RoutedEventArgs)

Invoked whenever an unhandled GotFocus event reaches this element in its route.

(Inherited from FrameworkElement) OnGotKeyboardFocus(KeyboardFocusChangedEventArgs)

Invoked when an unhandled GotKeyboardFocus attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.

(Inherited from UIElement) OnGotMouseCapture(MouseEventArgs)

Invoked when an unhandled GotMouseCapture attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.

(Inherited from UIElement) OnGotStylusCapture(StylusEventArgs)

Invoked when an unhandled GotStylusCapture attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.

(Inherited from UIElement) OnGotTouchCapture(TouchEventArgs)

Provides class handling for the GotTouchCapture routed event that occurs when a touch is captured to this element.

(Inherited from UIElement) OnGroupStyleSelectorChanged(GroupStyleSelector, GroupStyleSelector)

Invoked when the GroupStyleSelector property changes.

(Inherited from ItemsControl) OnInitialized(EventArgs)

Raises the Initialized event. This method is invoked whenever IsInitialized is set to internally.

(Inherited from Selector) OnIsKeyboardFocusedChanged(DependencyPropertyChangedEventArgs)

Invoked when an unhandled IsKeyboardFocusedChanged event is raised on this element. Implement this method to add class handling for this event.

(Inherited from UIElement) OnIsKeyboardFocusWithinChanged(DependencyPropertyChangedEventArgs)

Reports that the IsKeyboardFocusWithin property changed.

OnIsMouseCapturedChanged(DependencyPropertyChangedEventArgs)

Called when the IsMouseCaptured property changes.

OnIsMouseCaptureWithinChanged(DependencyPropertyChangedEventArgs)

Invoked when an unhandled IsMouseCaptureWithinChanged event is raised on this element. Implement this method to add class handling for this event.

(Inherited from UIElement) OnIsMouseDirectlyOverChanged(DependencyPropertyChangedEventArgs)

Invoked when an unhandled IsMouseDirectlyOverChanged event is raised on this element. Implement this method to add class handling for this event.

(Inherited from UIElement) OnIsStylusCapturedChanged(DependencyPropertyChangedEventArgs)

Invoked when an unhandled IsStylusCapturedChanged event is raised on this element. Implement this method to add class handling for this event.

(Inherited from UIElement) OnIsStylusCaptureWithinChanged(DependencyPropertyChangedEventArgs)

Invoked when an unhandled IsStylusCaptureWithinChanged event is raised on this element. Implement this method to add class handling for this event.

(Inherited from UIElement) OnIsStylusDirectlyOverChanged(DependencyPropertyChangedEventArgs)

Invoked when an unhandled IsStylusDirectlyOverChanged event is raised on this element. Implement this method to add class handling for this event.

(Inherited from UIElement) OnItemBindingGroupChanged(BindingGroup, BindingGroup)

Invoked when the ItemBindingGroup property changes.

(Inherited from ItemsControl) OnItemContainerStyleChanged(Style, Style)

Invoked when the ItemContainerStyle property changes.

(Inherited from ItemsControl) OnItemContainerStyleSelectorChanged(StyleSelector, StyleSelector)

Invoked when the ItemContainerStyleSelector property changes.

(Inherited from ItemsControl) OnItemsChanged(NotifyCollectionChangedEventArgs)

Updates the current selection when an item in the Selector has changed.

(Inherited from Selector) OnItemsPanelChanged(ItemsPanelTemplate, ItemsPanelTemplate)

Invoked when the ItemsPanel property changes.

(Inherited from ItemsControl) OnItemsSourceChanged(IEnumerable, IEnumerable)

Called when the source of an item in a selector changes.

(Inherited from Selector) OnItemStringFormatChanged(String, String)

Invoked when the ItemStringFormat property changes.

(Inherited from ItemsControl) OnItemTemplateChanged(DataTemplate, DataTemplate)

Invoked when the ItemTemplate property changes.

(Inherited from ItemsControl)
Sours: https://docs.microsoft.com/en-us/dotnet/api/system.windows.controls.combobox
How to Bind Combo Box and List Box in WPF C#

Getting Started with WPF ComboBox (ComboBoxAdv)

18 Aug 202116 minutes to read

This section provides a quick overview for working with the ComboBox (ComboBoxAdv).

View sample in GitHub.

Assembly deployment

Refer to the control dependencies section to get the list of assemblies or NuGet package that needs to be added as a reference to use the ComboBoxAdv control in any application.

You can find more details about installing the NuGet package in a WPF application in the following link:
How to install nuget packages

Creating Application with ComboBoxAdv control

In this walk through, user will create a WPF application that contains ComboBox control.

  1. Creating project
  2. Adding control via designer
  3. Adding control manually in XAML
  4. Adding control manually in C#
  5. Creating Data Model for sample application
  6. Binding to Data

Creating project

Below section provides detailed information to create new project in Visual Studio to display ComboBoxAdv.

Adding control via designer

The ComboBoxAdv control can be added to the application by dragging it from Toolbox and dropping it in designer. The required assemblies will be added automatically.

Adding control via designer

Adding control manually in XAML

In order to add ComboBoxAdv control manually in XAML, do the below steps,

  1. Add the below required assembly references to the project,

  2. Import Syncfusion WPF schema http://schemas.syncfusion.com/wpf in XAML page or Syncfusion.Windows.Tools.Controls namespace.

  3. Declare ComboBoxAdv in XAML page.

Adding control manually in C#

In order to add ComboBoxAdv control manually in C#, do the below steps,

  1. Add the below required assembly references to the project,

  2. Import ComboBoxAdv namespace Syncfusion.Windows.Tools.Controls.

  3. Create ComboBoxAdv control instance and add it to the page.

Adding items in ComboBoxAdv

Items can be added in the ComboBoxAdv control by following ways.

  1. Adding items by ComboBoxItemAdv.
  2. Adding items by DataBinding.

Add items using ComboBoxItemAdv

The items in ComboBoxAdv can be created by using ComboBoxItemAdv in XAML or C# code.

Adding items by DataBinding

The items in ComboBoxAdv can be added by data binding by following below procedure.

Creating Model and ViewModel data for DataBinding

  1. Create data object class named PopulationInfo and declare properties as shown below,
  1. Create a ViewModel class with several data objects in constructor.

Binding to Data

To bind the ComboBoxAdv to data, bind the collection created in previous step to ItemsSource property in XAML by setting as .

Binding display member

DisplayMemberPath denotes the path to a value on the data object for visual presentation of item to be displayed in combobox drop down list and displays the selected item in ComboBoxAdv.

Displaying WPF ComboBox

View the sample in GitHub

Defining ItemTemplate

You can customize the visualization of data object using the ItemTemplate.

Item template

Selection

ComboBoxAdv supports single and multiple selection of items. By default the selection of items in ComboBoxAdv is single selection. In order to select multiple items in ComboBoxAdv, enable the AllowMultiSelect property and select those multiple items from the drop down list.

MultiSelection

You can select the item or get the index of the selected item by using the SelectedIndex property. When an item is selected in ComboBoxAdv, you can get their information using SelectedItem or SelectedValue property. For multiple selected items, use SelectedItems property. The selection of the items can be handled using SelectionChanged event.

Editing

IsEditable property helps to edit the text in ComboBoxAdv.

Editable

Theme

ComboBoxAdv supports various built-in themes. Refer to the below links to apply themes for the ComboBoxAdv,

Setting theme to WPF comboBoxAdv

See Also

How to filter dropdown items in WPF editable ComboBoxAdv?

How to define maximum number of items to be shown in combobox dropdown?

Sours: https://help.syncfusion.com/wpf/combobox/getting-started

Drop down list wpf

Binding a WPF ComboBox to a custom list

I have a ComboBox that doesn't seem to update the SelectedItem/SelectedValue.

The ComboBox ItemsSource is bound to a property on a ViewModel class that lists a bunch of RAS phonebook entries as a CollectionView. Then I've bound (at separate times) both the or to another property of the ViewModel. I have added a MessageBox into the save command to debug the values set by the databinding, but the / binding is not being set.

The ViewModel class looks something like this:

The _phonebookEntries collection is being initialised in the constructor from a business object. The ComboBox XAML looks something like this:

I am only interested in the actual string value displayed in the ComboBox, not any other properties of the object as this is the value I need to pass across to RAS when I want to make the VPN connection, hence and are both the Name property of the ConnectionViewModel. The ComboBox is in a applied to an on a Window whose DataContext has been set to a ViewModel instance.

The ComboBox displays the list of items correctly, and I can select one in the UI with no problem. However when I display the message box from the command, the PhonebookEntry property still has the initial value in it, not the selected value from the ComboBox. Other TextBox instances are updating fine and displaying in the MessageBox.

What am I missing with databinding the ComboBox? I've done a lot of searching and can't seem to find anything that I'm doing wrong.


This is the behaviour I'm seeing, however it's not working for some reason in my particular context.

I have a MainWindowViewModel which has a of ConnectionViewModels. In the MainWindowView.xaml file code-behind, I set the DataContext to the MainWindowViewModel. The MainWindowView.xaml has an bound to the collection of ConnectionViewModels. I have a DataTemplate that holds the ComboBox as well as some other TextBoxes. The TextBoxes are bound directly to properties of the ConnectionViewModel using .

The XAML code-behind:

Then XAML:

The TextBoxes all bind correctly, and data moves between them and the ViewModel with no trouble. It's only the ComboBox that isn't working.

You are correct in your assumption regarding the PhonebookEntry class.

The assumption I am making is that the DataContext used by my DataTemplate is automatically set through the binding hierarchy, so that I don't have to explicitly set it for each item in the . That would seem a bit silly to me.


Here is a test implementation that demonstrates the problem, based on the example above.

XAML:

The code-behind:

If you run that example, you will get the behaviour I'm talking about. The TextBox updates its binding fine when you edit it, but the ComboBox does not. Very confusing seeing as really the only thing I've done is introduce a parent ViewModel.

I am currently labouring under the impression that an item bound to the child of a DataContext has that child as its DataContext. I can't find any documentation that clears this up one way or the other.

I.e.,

Window -> DataContext = MainWindowViewModel
..Items -> Bound to DataContext.PhonebookEntries
....Item -> DataContext = PhonebookEntry (implicitly associated)

I don't know if that explains my assumption any better(?).


To confirm my assumption, change the binding of the TextBox to be

And this will show the TextBox binding root (which I'm comparing to the DataContext) is the ConnectionViewModel instance.

Sours: https://stackoverflow.com/questions/561166/binding-a-wpf-combobox-to-a-custom-list
C# WPF Tutorial - ComboBox, ItemSource and Templates

Dropdown list Control for WPF

Display a drop-down list with custom UI. The C1DropDown control makes it easy to customize your dropdown control for WPF.

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Dropdown list Control for WPF

Specialized Drop-down Editors

With DropDown, you have complete control over creating specialized drop-down editors. Attach your logic to the spin buttons and your own drop-down form/editor to the drop-down button. For example, you could place a DataGrid in the drop-down portion and code its row selection event to display a value from that row in the header portion.

Specialized drop-down editors for WPF
Adaptive drop-down layout for WPF

Adaptive Drop-down Layout

You can explicitly set the width and height of the drop-down or have it sized automatically to fit the content.

Expandable Above/Below the Header

Configure the WPF drop-down box to display above or below the header portion, or set the direction preference the control will use if there is enough space available on the form.

Expandable Above/Below Headers for WPF

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Sours: https://www.grapecity.com/componentone/wpf-ui-controls/drop-down-list-wpf

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