ASP.NET Tutorial/Data Binding/TreeView
Содержание
Fibonacci Tree On Demand
<source lang="csharp">
<%@ Page Language="C#" Title="Fibonacci Tree On Demand" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> protected void PopulateNode(Object source, TreeNodeEventArgs e) {
double nodeText = double.Parse(e.Node.Text); double nodeValue = double.Parse(e.Node.Value); TreeNode newNode = new TreeNode(nodeValue.ToString(), (nodeText + nodeValue).ToString()); newNode.PopulateOnDemand = true; e.Node.ChildNodes.Add(newNode);
}
</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server" /> <body>
<form id="form1" runat="server">
Fibonacci Tree
<asp:TreeView ID="_fibonacciTree" OnTreeNodePopulate="PopulateNode"
runat="server" ExpandDepth="1">
<Nodes>
<asp:TreeNode Text="1" Value="1">
<asp:TreeNode PopulateOnDemand="true" Text="1" Value="2" />
</asp:TreeNode>
</Nodes>
</asp:TreeView>
</form>
</body> </html></source>
On demand file
<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="OnDemandFiles" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">
<title>Untitled Page</title>
</head> <body>
<form id="form1" runat="server">
<asp:TreeView ID="TreeView1" OnTreeNodePopulate="PopulateNode" runat="server" ExpandDepth="0">
<Nodes>
<asp:TreeNode PopulateOnDemand="True" Text="Demos" Value="Demos"></asp:TreeNode>
</Nodes>
</asp:TreeView>
</form>
</body> </html> File: Default.aspx.cs using System; using System.Collections; using System.Data; using System.Data.rumon; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; public partial class OnDemandFiles : System.Web.UI.Page {
static readonly char[] _slashArray = new char[] { "/" };
protected void PopulateNode(Object source, TreeNodeEventArgs e)
{
TreeNode node = e.Node;
if (node.Value == "Demos")
node.Value = "~/";
String rootDirectory = Request.MapPath("~/", Request.ApplicationPath, false);
String fullPath = Request.MapPath(node.Value, Request.ApplicationPath, false);
if (fullPath.StartsWith(rootDirectory) == false)
{
return;
}
String[] dirs = Directory.GetDirectories(fullPath);
foreach (String dir in dirs)
{
String virtualDir = node.Value.TrimEnd(_slashArray) + "/" + Path.GetFileName(dir);
TreeNode newNode = new TreeNode(Path.GetFileName(dir), virtualDir);
if (Directory.GetFiles(dir).Length > 0
|| Directory.GetDirectories(dir).Length > 0)
{
newNode.PopulateOnDemand = true;
}
node.ChildNodes.Add(newNode);
}
String[] files = Directory.GetFiles(fullPath);
foreach (String file in files)
{
TreeNode newNode = new TreeNode(Path.GetFileName(file), Path.GetFileName(file));
node.ChildNodes.Add(newNode);
}
}
}</source>
The ASP.NET 3.5 Framework includes two hierarchical DataBound controls
<source lang="csharp">
Menu: Displays data items in a static or dynamic menu. TreeView: Displays data items in a tree. <%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <body>
<form id="form1" runat="server">
TreeView
<asp:TreeView
id="CheckBoxList1"
DataSourceId="srcData"
Runat="server" />
Menu
<asp:Menu
id="BulletedList1"
DataSourceId="srcData"
Runat="server" />
<asp:XmlDataSource
id="srcData"
DataFile="~/Data.xml"
XPath="/movies/*"
Runat="server" />
</form>
</body> </html> File: Data.xml <movies>
<Adventure> <StarWars /> <JurassicPark /> <IndependenceDay /> </Adventure> <Animation> <IceAge /> <Shrek /> </Animation> <Drama> <Titanic /> <Ghost /> <ForrestGump /> </Drama> <Horrer> <Jaws /> <TheRing /> </Horrer>
</movies></source>
