TreeNodeBindingCollection.RemoveAt(Int32) Metodo

Definizione

Rimuove dall'oggetto TreeNodeBinding l'oggetto TreeNodeBindingCollection in corrispondenza della posizione di indice specificata.Removes the TreeNodeBinding object at the specified index location from the TreeNodeBindingCollection object.

public:
 void RemoveAt(int index);
public void RemoveAt (int index);
member this.RemoveAt : int -> unit
Public Sub RemoveAt (index As Integer)

Parametri

index
Int32

Posizione di indice in base zero dell'oggetto TreeNodeBinding da rimuovere.The zero-based index location of the TreeNodeBinding to remove.

Esempio

Nell'esempio di codice riportato di seguito viene illustrato come utilizzare il RemoveAt metodo per rimuovere un oggetto a livello di codice TreeNodeBinding da un TreeNodeBindingCollection oggetto.The following code example demonstrates how to use the RemoveAt 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 RemoveAt method to remove the TreeNodeBinding object 
    // for the third-level nodes (index 2).
    BookTreeView.DataBindings.RemoveAt(2);

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

    // Use the Insert method to insert the TreeNodeBinding object 
    // into the DaaBindings collection at index 2.
    BookTreeView.DataBindings.Insert(2, newBinding);

  }

</script>

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

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

        ' Use the Insert method to insert the TreeNodeBinding object to
        ' the DataBindings collection at index 2.
        BookTreeView.DataBindings.Insert(2, newBinding)

    End Sub

</script>

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

Usare il RemoveAt metodo per rimuovere l' TreeNodeBinding oggetto che si trova in index da un TreeNodeBindingCollection oggetto.Use the RemoveAt method to remove the TreeNodeBinding object located at index from a TreeNodeBindingCollection object. 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 oggetto specifico TreeNodeBinding usando il Remove metodo.As an alternative, you can remove a specific TreeNodeBinding object by using the Remove method. È anche possibile rimuovere ogni nodo della raccolta usando il Clear metodo.You can also remove every node in the collection by using the Clear method.

Si applica a

Vedi anche