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ListView::CacheVirtualItems Event

Occurs when the contents of the display area for a ListView in virtual mode has changed, and the ListView determines that a new range of items is needed.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public:
 event CacheVirtualItemsEventHandler^ CacheVirtualItems {
	void add (CacheVirtualItemsEventHandler^ value);
	void remove (CacheVirtualItemsEventHandler^ value);
}

This event only occurs when VirtualMode is true. Handling this event allows the ListView to update the item information held in the cache so that it is readily available. This can improve performance on large lists, or lists whose items are expensive to calculate.

For more information about handling events, see Handling and Raising Events.

The following code example demonstrates the use of this member. In the example, the event handler checks to make sure a cache refresh is really necessary, and then rebuilds the cache. This code example is part of a larger example provided for the VirtualMode property.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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