TreeNodeCollection.IndexOf Method (TreeNode)
.NET Framework (current version)
Determines the index of the specified TreeNode object.
Assembly: System.Web (in System.Web.dll)
Parameters
- value
-
Type:
System.Web.UI.WebControls.TreeNode
The TreeNode object to locate.
Return Value
Type: System.Int32The zero-based index of the first occurrence of value within the TreeNodeCollection, if found; otherwise, -1.
Use the IndexOf method to determine the zero-based index of the specified TreeNode object in the TreeNodeCollection object. If the node is not in the collection, the method returns -1.
Note |
|---|
If the specified node appears multiple times in the collection, the index of the first occurrence is returned. |
The following example demonstrates how to use the IndexOf method to determine the index of a root node. Notice that the Nodes property returns a TreeNodeCollection object.
<%@ 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 Node_Changed(Object sender, EventArgs e) { // Determine whether the Nodes collection contains the selected node // and display the appropriate message. if(LinksTreeView.Nodes.Contains(LinksTreeView.SelectedNode)) { Message.Text = "The index of " + LinksTreeView.SelectedNode.Text + " is " + LinksTreeView.Nodes.IndexOf(LinksTreeView.SelectedNode).ToString(); } else { Message.Text = "The selected node is not a root node."; } } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>TreeNodeCollection Contains Example</title> </head> <body> <form id="form1" runat="server"> <h3>TreeNodeCollection Contains Example</h3> <h5>Click a root node.</h5> <asp:TreeView id="LinksTreeView" Font-Names= "Arial" ForeColor="Blue" OnSelectedNodeChanged="Node_Changed" 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" Expanded="true"> <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="Subtopic 1"/> <asp:TreeNode Text="Subtopic 2"/> </asp:TreeNode> <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> <hr /> <asp:Label id="Message" runat="server"/> </form> </body> </html>
.NET Framework
Available since 2.0
Available since 2.0
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