TreeNodeBindingCollection.Item[Int32] 屬性

  • 參考

定義

命名空間:
System.Web.UI.WebControls
組件:
System.Web.dll

取得或設定位於 TreeNodeBinding 物件中所指定索引處的 TreeNodeBindingCollection 物件。

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

參數

i
Int32

要擷取的 TreeNodeBinding 之以零起始索引。

屬性值

TreeNodeBinding

TreeNodeBinding 中指定索引處的 TreeNodeBindingCollection。

範例

下列程式碼範例示範如何使用 Item[] 索引子來存取 物件中的 TreeNodeBindingCollection 專案。 第 TreeNodeBinding 三層節點的物件會以程式設計方式以新值更新。 若要讓此範例正常運作，您必須將位於本節結尾的 XML 資料複製到名為 Book.xml 的檔案。


<%@ 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>

以下是上述程式碼範例的 XML 資料。

<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>

備註

Item[]使用索引子從使用陣列標記法的 物件存取 TreeNodeBinding TreeNodeBindingCollection 物件 i 。 索引 Item[] 器可讓您直接修改或取代 TreeNodeBinding 集合中的 物件。

適用於

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