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TreeNodeBindingCollection.Item[Int32] Propriedade

  • Referência

Definição

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Obtém ou define o TreeNodeBinding objeto no índice especificado no TreeNodeBindingCollection objeto.

public:
 property System::Web::UI::WebControls::TreeNodeBinding ^ default[int] { System::Web::UI::WebControls::TreeNodeBinding ^ get(int i); void set(int i, System::Web::UI::WebControls::TreeNodeBinding ^ value); };
public System.Web.UI.WebControls.TreeNodeBinding this[int i] { get; set; }
member this.Item(int) : System.Web.UI.WebControls.TreeNodeBinding with get, set
Default Public Property Item(i As Integer) As TreeNodeBinding

Parâmetros

i
Int32

O índice de base zero do TreeNodeBinding a recuperar.

Valor da propriedade

TreeNodeBinding

No TreeNodeBinding índice especificado no TreeNodeBindingCollection.

Exemplos

O exemplo de código a seguir demonstra como usar o Item[] indexador para acessar os itens que estão em um TreeNodeBindingCollection objeto. O TreeNodeBinding objeto para os nós de terceiro nível é atualizado programaticamente com novos valores. Para que este exemplo funcione corretamente, você deve copiar os dados XML localizados no final desta seção para um arquivo chamado Book.xml.


<%@ 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)
  {

    // Use the indexer to access the TreeNodeBinding object for
    // the third-level nodes (index 2) and change the value of 
    // its TextField property to "Subject".
    BookTreeView.DataBindings[2].TextField = "Subject";

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNodeBindingCollection Indexer Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNodeBindingCollection Indexer Example</h3>
    
      <asp:TreeView id="BookTreeView" 
        DataSourceID="BookXmlDataSource"
        runat="server">
         
        <DataBindings>
          <asp:TreeNodeBinding DataMember="Book" TextField="Title"/>
          <asp:TreeNodeBinding DataMember="Chapter" TextField="Heading"/>
          <asp:TreeNodeBinding DataMember="Section" TextField="Heading"/>
        </DataBindings>
         
      </asp:TreeView>

      <asp:XmlDataSource id="BookXmlDataSource"  
        DataFile="Book.xml"
        runat="server">
      </asp:XmlDataSource>
    
    </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)

    ' Use the indexer to access the TreeNodeBinding object for
    ' the third-level nodes (index 2) and change the value of 
    ' its TextField property to "Subject".
    BookTreeView.DataBindings(2).TextField = "Subject"

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNodeBindingCollection Indexer Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNodeBindingCollection Indexer Example</h3>
    
      <asp:TreeView id="BookTreeView" 
        DataSourceID="BookXmlDataSource"
        runat="server">
         
        <DataBindings>
          <asp:TreeNodeBinding DataMember="Book" TextField="Title"/>
          <asp:TreeNodeBinding DataMember="Chapter" TextField="Heading"/>
          <asp:TreeNodeBinding DataMember="Section" TextField="Heading"/>
        </DataBindings>
         
      </asp:TreeView>

      <asp:XmlDataSource id="BookXmlDataSource"  
        DataFile="Book.xml"
        runat="server">
      </asp:XmlDataSource>
    
    </form>
  </body>
</html>

Veja a seguir os dados XML do exemplo de código anterior.

<Book Title="Book Title">  
    <Chapter Heading="Chapter 1">  
        <Section Heading="Section 1"  
            Subject="Subject 1">  
        </Section>  
        <Section Heading="Section 2"  
            Subject="Subject 1">  
        </Section>  
    </Chapter>  
    <Chapter Heading="Chapter 2">  
        <Section Heading="Section 1"  
            Subject="Subject 1">  
        </Section>  
    </Chapter>  
</Book>

Comentários

Use o Item[] indexador para acessar um TreeNodeBinding objeto do TreeNodeBindingCollection objeto localizado no i uso da notação de matriz. O Item[] indexador permite que você modifique ou substitua um TreeNodeBinding objeto na coleção diretamente.

Aplica-se a

Confira também