TreeNodeBindingCollection.Remove(TreeNodeBinding) Metodo

Definizione

Rimuove dall'oggetto TreeNodeBinding l'oggetto TreeNodeBindingCollection specificato.Removes the specified TreeNodeBinding object from the TreeNodeBindingCollection object.

public:
 void Remove(System::Web::UI::WebControls::TreeNodeBinding ^ binding);
public void Remove (System.Web.UI.WebControls.TreeNodeBinding binding);
member this.Remove : System.Web.UI.WebControls.TreeNodeBinding -> unit
Public Sub Remove (binding As TreeNodeBinding)

Parametri

binding
TreeNodeBinding

Oggetto TreeNodeBinding da rimuovere.The TreeNodeBinding to remove.

Esempio

Nell'esempio di codice riportato di seguito viene illustrato come utilizzare il Remove metodo per rimuovere un oggetto a livello di codice TreeNodeBinding da un TreeNodeBindingCollection oggetto.The following code example demonstrates how to use the Remove method to remove a TreeNodeBinding object programmatically from a TreeNodeBindingCollection object. Per il corretto funzionamento di questo esempio, è necessario copiare i dati XML che si trovano alla fine di questa sezione in un file denominato Book.xml.For this example to work correctly, you must copy the XML data that is located at the end of this section to a file called 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 Remove method to remove the TreeNodeBinding object
    // for the third-level nodes (index 2).
    TreeNodeBinding oldBinding = BookTreeView.DataBindings[2];
    BookTreeView.DataBindings.Remove(oldBinding);

    // Create a new TreeNodeBinding object and set its properties.
    TreeNodeBinding newBinding = new TreeNodeBinding();
    newBinding.DataMember = "Section";
    newBinding.TextField = "Subject";

    // Use the Add method to add the TreeNodeBinding object to the 
    // DataBindings collection.
    BookTreeView.DataBindings.Add(newBinding);

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNodeBindingCollection Add and Remove Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNodeBindingCollection Add and Remove 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 Remove method to remove the TreeNodeBinding object
    ' for the third-level nodes (index 2).
    Dim oldBinding As TreeNodeBinding = BookTreeView.DataBindings(2)
    BookTreeView.DataBindings.Remove(oldBinding)

    ' Create a new TreeNodeBinding object and set its properties.
    Dim newBinding As TreeNodeBinding = New TreeNodeBinding
    newBinding.DataMember = "Section"
    newBinding.TextField = "Subject"

    ' Use the Add method to add the TreeNodeBinding object to the 
    ' DataBindings collection.
    BookTreeView.DataBindings.Add(newBinding)

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNodeBindingCollection Add and Remove Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNodeBindingCollection Add and Remove 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>

Di seguito sono riportati i dati XML per l'esempio di codice precedente.The following is the XML data for the preceding code example.

<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>  

Commenti

Utilizzare il Remove metodo per rimuovere l' TreeNodeBinding oggetto specificato dalla raccolta.Use the Remove method to remove the specified TreeNodeBinding object from the collection. Tutti gli elementi che seguono quel nodo vengono spostati verso l'alto in modo da riempire la posizione vacante.All items that follow that node are then moved up to fill the vacant position. Vengono aggiornati anche gli indici degli elementi spostati.The indexes of the moved items are also updated.

In alternativa, è possibile rimuovere un nodo in corrispondenza di un indice specifico usando il RemoveAt metodo.As an alternative, you can remove a node at a specific index using the RemoveAt method. È anche possibile rimuovere ogni nodo della raccolta usando il Clear metodo.You can also remove every node in the collection using the Clear method.

Si applica a

Vedi anche