TreeNodeCollection.Contains(TreeNode) Metode
Definisi
Penting
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Menentukan apakah objek yang ditentukan TreeNode ada dalam koleksi.
public:
bool Contains(System::Web::UI::WebControls::TreeNode ^ c);public bool Contains(System.Web.UI.WebControls.TreeNode c);member this.Contains : System.Web.UI.WebControls.TreeNode -> boolPublic Function Contains (c As TreeNode) As BooleanParameter
Mengembalikan
true jika objek yang ditentukan terkandung TreeNode dalam koleksi; jika tidak, false.
Contoh
Contoh berikut menunjukkan cara menggunakan Contains metode untuk menentukan apakah simpul yang dipilih ada dalam Nodes koleksi. Perhatikan bahwa Nodes properti mengembalikan TreeNodeCollection objek.
<%@ 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>
<%@ 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 Node_Changed(ByVal sender As Object, ByVal e As EventArgs)
' Determine whether the Nodes collection contains the selected node
' and display the appropriate message.
If LinksTreeView.Nodes.Contains(LinksTreeView.SelectedNode) Then
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."
End If
End Sub
</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>
Keterangan
Contains Gunakan metode untuk menentukan apakah TreeNode objek terkandung dalam TreeNodeCollection. Metode ini biasanya digunakan untuk menguji keberadaan TreeNode objek sebelum melakukan tugas, seperti menambahkan atau menghapus simpul dari koleksi.
