TreeNode.Selected Свойство

Определение

Получает или задает значение, указывающее, выделен ли узел.

public:
 property bool Selected { bool get(); void set(bool value); };
public bool Selected { get; set; }
member this.Selected : bool with get, set
Public Property Selected As Boolean

Значение свойства

Boolean

true, если данный узел выделен; в противном случае false. Значение по умолчанию — false.

Примеры

В следующем примере кода показано, как использовать Selected свойство для выбора узла в элементе TreeView управления.


<%@ 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>

Комментарии

Selected Используйте свойство, чтобы указать или определить, выбран ли узел.

Примечание

Хотя свойство можно использовать для определения того, выбран ли узел, чаще всего используется SelectedNode свойство.

При использовании этого свойства в элементе TreeView управления можно выбрать только один узел.

Примечание

В качестве альтернативы можно также выбрать узел с помощью Select метода.

Значение этого свойства хранится в состоянии представления.

Применяется к

См. также раздел