Virtual Mode

This demo shows how Virtual Mode helps you improve tree view performance.

In addition to bound and unbound modes, the ASPxTreeView supports Virtual Mode. This mode significantly reduces server load and startup time when you work with complex or dynamically generated hierarchies. In Virtual Mode, the control retrieves data from the server in portions: at startup and when users expand nodes. Child nodes are created and initialized only when their parent node is expanded for the first time. This approach improves server resource usage and removes the need to load the entire hierarchy upfront.

To activate Virtual Mode for the ASPxTreeView, handle its VirtualModeCreateChildren event, which occurs when expanding nodes for the first time. Within the event handler, you need to create a list of TreeViewVirtualNode objects representing child nodes for the currently expanded node. If a child node has no children, set its IsLeaf property to true, to not show the expand button for this node.

In this demo, the ASPxTreeView uses Virtual Mode to display the file/folder tree of the demo's web site.