Virtual Mode

In addition to bound and unbound modes, the TreeView extension can operate in a Virtual Mode, which greatly reduces both the server load and start-up time when working with complex or dynamically created data. In a virtual mode, a tree is created on demand. In this instance, child nodes are created and initialized when their parent node is expanded.

To implement a virtual mode for the TreeView extension, you should use a specifically parameterized BindToVirtualData method. The method's parameter refers to the delegate method that can be declared as a static method within a model class. Within this delegate method, create a list of business objects that correspond to the child nodes owned by the processed node.

In this demo, the TreeView extension uses this data binding method to display the file/folder tree of this demo's website.