TreeNodeTypes Enumeration
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace: System.Web.UI.WebControlsAssembly: System.Web (in system.web.dll)
The TreeNodeTypes enumeration is used to represent the different node types that are available in the TreeView control. The following table describes the three different node types.
| Node type | Description |
|---|---|
| Leaf | A node with no child nodes. |
| Parent | A node with a parent node and one or more child nodes. |
| Root | A node with no parent node and one or more child nodes. |
The TreeNodeTypes enumeration is a flag enumeration, which allows you to combine values through bitwise operations. For example, to represent the parent and leaf nodes, you can perform a bitwise OR operation on the Parent and Leaf values.
Note: |
|---|
| The ShowCheckBoxes property uses the TreeNodeTypes enumeration to represent the node types that display check boxes in the TreeView control. When it is set to a value other than the None value, check boxes are displayed next to the specified node type, which allows users to select multiple items from the TreeView control. |
The following code example demonstrates how to use the TreeNodeTypes enumeration to indicate that the TreeView control should show a check box for each of the parent and leaf nodes only.
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> void Button_Click(Object sender, EventArgs e) { if(LinksTreeView.CheckedNodes.Count > 0) { // Clear the message label. Message.Text = "You selected: <br /><br />"; // Iterate through the CheckedNodes collection and display the selected nodes. foreach (TreeNode node in LinksTreeView.CheckedNodes) { Message.Text += node.Text + "<br />"; } } else { Message.Text = "No items selected."; } } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>TreeView ShowCheckBoxes Example</title> </head> <body> <form id="form1" runat="server"> <h3>TreeView ShowCheckBoxes Example</h3> <!-- Set the ShowCheckBoxes property declaratively. --> <!-- Because the ShowCheckBoxes property uses a flag --> <!-- enumeration, you can combine multiple values by --> <!-- using the bitwise OR operator. In declarative --> <!-- syntax, this is done using a comma separated --> <!-- list. --> <asp:TreeView id="LinksTreeView" Font-Names= "Arial" ForeColor="Blue" ExpandDepth="2" ShowCheckBoxes="Parent,Leaf" runat="server"> <LevelStyles> <asp:TreeNodeStyle ChildNodesPadding="10" Font-Bold="true" Font-Size="12pt" ForeColor="DarkGreen"/> <asp:TreeNodeStyle ChildNodesPadding="5" Font-Bold="true" Font-Size="10pt"/> <asp:TreeNodeStyle ChildNodesPadding="5" Font-UnderLine="true" Font-Size="10pt"/> <asp:TreeNodeStyle ChildNodesPadding="10" Font-Size="8pt"/> </LevelStyles> <Nodes> <asp:TreeNode Text="Table of Contents" SelectAction="None"> <asp:TreeNode Text="Chapter One"> <asp:TreeNode Text="Section 1.0"> <asp:TreeNode Text="Topic 1.0.1"/> <asp:TreeNode Text="Topic 1.0.2"/> <asp:TreeNode Text="Topic 1.0.3"/> </asp:TreeNode> <asp:TreeNode Text="Section 1.1"> <asp:TreeNode Text="Topic 1.1.1"/> <asp:TreeNode Text="Topic 1.1.2"/> <asp:TreeNode Text="Topic 1.1.3"/> <asp:TreeNode Text="Topic 1.1.4"/> </asp:TreeNode> </asp:TreeNode> <asp:TreeNode Text="Chapter Two"> <asp:TreeNode Text="Section 2.0"> <asp:TreeNode Text="Topic 2.0.1"/> <asp:TreeNode Text="Topic 2.0.2"/> </asp:TreeNode> </asp:TreeNode> </asp:TreeNode> <asp:TreeNode Text="Appendix A" /> <asp:TreeNode Text="Appendix B" /> <asp:TreeNode Text="Appendix C" /> </Nodes> </asp:TreeView> <br /><br /> <asp:Button id="Submit" Text="Select Items" OnClick="Button_Click" runat="server"/> <br /><br /> <asp:Label id="Message" runat="server"/> </form> </body> </html>
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