![]() ![]() Pressing Ctrl by itself does nothing in most programs. can click any Ctrl shortcut links below to open a page with a full list of uses for each shortcut. Namespace TreeList_UnboundMode_ViaBeforeExpandEvent ) FindNodeByFieldValue - Returns a node by its field value.FindNodeByKeyID - Returns the node by its key field value.FindNodeByID - Returns the node specified by its identifier.TreeListNode.ParentNode - Gets the parent node of the current tree node.TreeListNode.Nodes - Gets the collection of the node’s children.TreeList.Nodes - Provides access to the collection of the TreeList’s root nodes. ![]() TreeList.GetRowCellDisplayText - Returns the text displayed by a specific Tree List cell.TreeList.GetRowCellValue - Retrieves the value stored within the required cell.TreeList.SetRowCellValue - Sets the TreeList cell to a specific value.In this instance, the control is updated only once, by the EndUnboundLoad method. For performance reasons, you can avoid unnecessary updates by enclosing your code with the TreeList.BeginUnboundLoad and TreeList.EndUnboundLoad methods. If you perform multiple subsequent calls to these methods, multiple updates take place. Batch Modifications in CodeĮvery time the TreeList.AppendNode method or another method that modifies the node structure is called, the Tree List control performs an update. To import the previously saved data, use the TreeList.ImportFromXml method.įor more information on data export, see the following help topic: Export and Import Data. To export the data, use the TreeList.ExportToXml method. In unbound mode, you can export nodes and their data to a stream or file in XML format, and then load it later. For child nodes that have their own children, you also need to set the TreeListNode.HasChildren property to true. Handle the TreeList.BeforeExpand event to supply children for expanded nodes. ![]() The control displays expand buttons for these nodes. You can implement dynamic loading as follows:Ĭreate root Tree List nodes at design time, or with the TreeList.AppendNode method.įor nodes that have children, set the TreeListNode.HasChildren property to true. To improve the control’s performance for large volumes of data, you may consider dynamic data loading - create root nodes on form loading and supply child nodes dynamically, on demand, when parent nodes are expanded. You can create all the nodes beforehand (for instance, on form loading).
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