TreeNodeCollection.Count Properti
Definisi
Penting
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Mendapatkan jumlah item dalam TreeNodeCollection objek.
public:
property int Count { int get(); };public int Count { get; }member this.Count : intPublic ReadOnly Property Count As IntegerNilai Properti
Jumlah item dalam TreeNodeCollection.
Penerapan
Contoh
Contoh berikut menunjukkan cara menggunakan Count properti untuk menentukan jumlah item dalam TreeNodeCollection. Kemudian melakukan traversal TreeView preorder kontrol untuk menampilkan teks setiap simpul.
<%@ 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 Page_Load(Object sender, EventArgs e)
{
// If the TreeView control contains any root nodes, perform a
// preorder traversal of the tree and display the text of each node.
if(LinksTreeView.Nodes.Count > 0)
{
// Iterate through the root nodes in the Nodes property.
for(int i=0; i<LinksTreeView.Nodes.Count; i++)
{
// Display the nodes.
DisplayChildNodeText(LinksTreeView.Nodes[i]);
}
}
else
{
Message.Text = "The TreeView control does not have any nodes.";
}
}
void DisplayChildNodeText(TreeNode node)
{
// Display the node's text value.
Message.Text += node.Text + "<br />";
// Iterate through the child nodes of the parent node passed into
// this method and display their values.
for(int i=0; i<node.ChildNodes.Count; i++)
{
// Recursively call the DisplayChildNodeText method to
// traverse the tree and display all the child nodes.
DisplayChildNodeText(node.ChildNodes[i]);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNodeCollection Count Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNodeCollection Count Example</h3>
<asp:TreeView id="LinksTreeView"
Font-Names= "Arial"
ForeColor="Blue"
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>
<br /><br />
<asp:Label id="Message"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' If the TreeView control contains any root nodes, perform a
' preorder traversal of the tree and display the text of each node.
If LinksTreeView.Nodes.Count > 0 Then
' Iterate through the root nodes in the Nodes property.
Dim i As Integer
For i = 0 To LinksTreeView.Nodes.Count - 1
' Display the nodes.
DisplayChildNodeText(LinksTreeView.Nodes(i))
Next i
Else
Message.Text = "The TreeView control does not have any nodes."
End If
End Sub
Sub DisplayChildNodeText(ByVal node As TreeNode)
' Display the node's text value.
Message.Text &= node.Text & "<br />"
' Iterate through the child nodes of the parent node passed into
' this method and display their values.
Dim i As Integer
For i = 0 To node.ChildNodes.Count - 1
' Recursively call the DisplayChildNodeText method to
' traverse the tree and display all the child nodes.
DisplayChildNodeText(node.ChildNodes(i))
Next i
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNodeCollection Count Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNodeCollection Count Example</h3>
<asp:TreeView id="LinksTreeView"
Font-Names= "Arial"
ForeColor="Blue"
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>
<br /><br />
<asp:Label id="Message"
runat="server"/>
</form>
</body>
</html>
Keterangan
Count Gunakan properti untuk menentukan jumlah item dalam TreeNodeCollection. Properti ini umumnya digunakan saat melakukan iterasi melalui koleksi untuk menentukan batas atas koleksi. Properti Count ini juga umumnya digunakan untuk menentukan apakah koleksi kosong.
