TreeNode

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70-505 Study Guide 70-526 Study Guide

1. Forms Controls Add/configure a Form Manage control layout Add/configure a control Use IDE Add controls Configure controls Modify Control Properties Configure controls Create/configure command controls Create/configure text edit controls Create/configure text display controls LinkLabel Control Create List Controls Configure Layout and Functionality Value-setting controls WebBrowser control Date-setting controls Display images NotifyIcon Access keys Create/configure menus Create event handlers 2. Integrating Data 3. Printing/Reporting 4. Enhancing Usability 5. Asynchronous Prog. 6. Forms Controls 7. Configure/Deploy

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Exam 70-526 Preparation Guide: Configure the layout and functionality of a Windows Form to display a list of items

Contents 1 Inheritance hierarchy 2 Useful properties 3 Expanding or Collapsing nodes manually 4 MSDN references

Each node in a TreeView is an instance of the TreeNode class. A TreeNode contains information about its location within a TreeView and any child nodes that it may contain.

Inheritance hierarchy

System.Object
  System.MarshalByRefObject
    System.Windows.Forms.TreeNode

Useful properties

• FirstNode - Gets the first child tree node in the tree node collection.

• ImageIndex - Gets or sets the image-list index value of the default image that is displayed by the tree nodes. By default this value is equal to TreeView.ImageIndex. To specify another image index, you must set this property explicitly.

• LastNode - Gets the last child tree node.

• NextNode - Gets the next sibling tree node.

• NextVisibleNode - Gets the next visible tree node.

• Nodes - Gets the collection of TreeNode objects assigned to the current tree node.

• Parent - Gets the parent tree node of the current tree node. If the current node is a root node in the TreeView, accessing this property will throw a NullReferenceException.

• PrevNode - Gets the previous sibling tree node.

• PrevVisibleNode - Gets the previous visible tree node.

• SelectedImageIndex - Defines the image list index value of the image that is displayed when the tree node is in the selected state. By default this value is equal to TreeView.SelectedImageIndex. To specify another image index, you must set this property explicitly.

• Text - Defines the text displayed in the label of the tree node.

• TreeView - Gets the parent tree view that the tree node is assigned to.

Expanding or Collapsing nodes manually

At some point you may wish to expand or collapse a node within a TreeView without intervention form the user. This is done through the use of two methods within the TreeNode class.

To expand a node, call the method Expand as follows:

Node1.Expand();

To collapse a node, call the method Collapse as follows:

Node1.Collapse();

MSDN references

• TreeNode Class