Listbox template

Does anybody know why adding a DockPanel and a TextBlock makes it so slow?? The two styles are listed bellow. Style1 keeps the listbox fast. Style2 makes the listbox very slow. I can explain the effect ScrollViewer in Avalon has very generic scrolling functionality built-in: it measures the "blob" inside of it and shows scrollbars.

VirtualStackPanel implements IScrollInfo interface - that means it can scroll its content itself, and can benefit from doing it itself. In particular, it may optimize out layout operations on the items that are outside of the visible viewport of the ScrollViewer.

Though if you're not going to do anything else you might want to just use a StackPanel with vertical orientation because it should probably a little more light weight in the layout department than a DockPanel. Can you try that and see if the performance gets any better? Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.

Privacy policy. Thank you. Microsoft makes no warranties, express or implied, with respect to the information provided here. Gets or sets the DataTemplate used to display each item. A DataTemplate that specifies the visualization of the data objects. The default is null. The following example shows how to create a DataTemplate inline.

Public Class Tasks. InitializeComponent ;. List ;. IsMatch e. Text ;. Imports WpfAppExample2. Class MainWindow. Public Sub New. NewValue is bool. Control sender. Next ;. Private Sub New. RegisterAttached "GiveInitialFocus" ,.

Report and Dashboard Server. BI Dashboard. Office File API. End-User Documentation. Interface Elements for Desktop. Interface Elements for Web. Dashboard for Desktop. Dashboard for Web. Download CHM. Run Demo Item Template Capabilities The item template can consist of any number of text and image elements.

You can display images in all Listbox controls. The dedicated Item Template Designer provides the capability to set up the item template at design time. Dynamic templated item customization at runtime with the BaseListBoxControl. CustomizeItem event. Create multiple item templates and substitute them at runtime with the BaseListBoxControl. Bound and unbound elements in the item template. Unbound elements display static text and images; bound elements display data from underlying data source fields.

Multiple alignment options for template elements, including alignment relative to other elements, and absolute or relative element size specification. Columns list - Displays fields from the data source bound to the ListBox control. Elements list - Displays existing template elements. You can use the buttons at the top of the list to add and delete elements.

You can also drag fields from the Columns list onto the design surface to add elements. Set Up Item Template The item template is based on the common Table Layout concept in which the design surface is divided into logical columns and rows, and the contents are placed in corresponding cells which can be merged if required.

The supported template customization actions include: Drag-and-drop fields from the Columns list onto table cells. When you drop a field onto a cell, it automatically creates a bound template element. Drag-and-drop created elements between cells.