TreeNode.Selected Eigenschap
Definitie
Belangrijk
Bepaalde informatie heeft betrekking op een voorlopige productversie die aanzienlijk kan worden gewijzigd voordat deze wordt uitgebracht. Microsoft biedt geen enkele expliciete of impliciete garanties met betrekking tot de informatie die hier wordt verstrekt.
Hiermee wordt een waarde opgehaald of ingesteld die aangeeft of het knooppunt is geselecteerd.
public:
property bool Selected { bool get(); void set(bool value); };public bool Selected { get; set; }member this.Selected : bool with get, setPublic Property Selected As BooleanWaarde van eigenschap
true als het knooppunt is geselecteerd; anders, false. De standaardwaarde is false.
Voorbeelden
In het volgende codevoorbeeld ziet u hoe u de Selected eigenschap gebruikt om een knooppunt in het TreeView besturingselement te selecteren.
<%@ 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_Command(Object sender, CommandEventArgs e)
{
// Iterate through the child nodes of the root node and find
// the nodes for Chapter One and Chapter Two.
foreach(TreeNode node in LinksTreeView.Nodes[0].ChildNodes)
{
// Select the appropriate node based on which button was clicked.
switch(node.Text)
{
case "Chapter One":
// If the button clicked was "Chapter One", select the node
// using the Selected property.
if (e.CommandName == "Chapter One")
{
// Select the node using the Selected property.
node.Selected = true;
}
break;
case "Chapter Two":
// If the button clicked was "Chapter Two", select the node
// using the Select method.
if (e.CommandName == "Chapter Two")
{
// Select the node using the Select method.
node.Select();
}
break;
default:
// Do nothing.
break;
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNode Selected and Select() Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNode Selected and Select() Example</h3>
<asp:TreeView id="LinksTreeView"
Font-Names= "Arial"
ForeColor="Blue"
SelectedNodeStyle-BackColor="Yellow"
ExpandDepth="2"
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">
<asp:TreeNode Text="Chapter One"
Selected="True">
<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="SelectChapterOneButton"
Text="Select Chapter One"
CommandName="Chapter One"
OnCommand="Button_Command"
runat="server"/>
<asp:Button id="SelectChapterTwoButton"
Text="Select Chapter Two"
CommandName="Chapter Two"
OnCommand="Button_Command"
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 Button_Command(ByVal sender As Object, ByVal e As CommandEventArgs)
' Iterate through the child nodes of the root node and find
' the nodes for Chapter One and Chapter Two.
Dim node As TreeNode
For Each node In LinksTreeView.Nodes(0).ChildNodes
' Select the appropriate node based on which button was clicked.
Select Case node.Text
Case "Chapter One"
' If the button clicked was "Chapter One", select the node
' using the Selected property.
If e.CommandName = "Chapter One" Then
' Select the node using the Selected property.
node.Selected = True
End If
Case "Chapter Two"
' If the button clicked was "Chapter Two", select the node
' using the Selected method.
If e.CommandName = "Chapter Two" Then
' Select the node using the Select method.
node.Select()
End If
Case Else
' Do nothing.
End Select
Next
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNode Selected and Select() Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNode Selected and Select() Example</h3>
<asp:TreeView id="LinksTreeView"
Font-Names= "Arial"
ForeColor="Blue"
SelectedNodeStyle-BackColor="Yellow"
ExpandDepth="2"
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">
<asp:TreeNode Text="Chapter One"
Selected="True">
<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="SelectChapterOneButton"
Text="Select Chapter One"
CommandName="Chapter One"
OnCommand="Button_Command"
runat="server"/>
<asp:Button id="SelectChapterTwoButton"
Text="Select Chapter Two"
CommandName="Chapter Two"
OnCommand="Button_Command"
runat="server"/>
</form>
</body>
</html>
Opmerkingen
Gebruik de Selected eigenschap om op te geven of te bepalen of het knooppunt is geselecteerd.
Note
Hoewel de eigenschap kan worden gebruikt om te bepalen of het knooppunt is geselecteerd, is het gebruikelijker om de SelectedNode eigenschap te gebruiken.
Er kan slechts één knooppunt tegelijk in het TreeView besturingselement worden geselecteerd wanneer u deze eigenschap gebruikt.
Note
Als alternatief kunt u ook het knooppunt selecteren met behulp van de Select methode.
De waarde van deze eigenschap wordt opgeslagen in de weergavestatus.