Too many items in the ComboBox of WPF causes slow loading.

Source: Internet
Author: User
[WFP problem] too many items in the WPF ComboBox may cause slow loading.
Zhou yinhui One of my colleagues encountered a crashing problem when loading the font list: because the system may have many fonts (several hundred items may exist), it is very slow to display the font list using ComboBox, 3 ~ 5 seconds. This is because ComboBox draws each item in the list when expanding the list. To avoid this problem, we can use virtualizingstackpanel to replace the default project panel stackpanel of ComboBox:
<ComboBox X: Name = "comboboxfontlist"
Verticalalignment = "TOP">
<ComboBox. itemspanel>
<Itemspaneltemplate>
<Virtualizingstackpanel/>
</Itemspaneltemplate>
</ComboBox. itemspanel>
</ComboBox> The speed is as fast as loading a small number of projects, because it only draws the currently displayed items. For more information about virtualizingstackpanel, see here: http://msdn.microsoft.com/en-us/library/system.windows.controls.virtualizingstackpanel.aspx

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