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XmlDataSource.Transforming 事件

  • 參考

定義

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

在 Transform 屬性所定義或 TransformFile 屬性所識別的樣式表套用至 XML 資料之前發生。

public:
 event EventHandler ^ Transforming;
public event EventHandler Transforming;
member this.Transforming : EventHandler 
Public Custom Event Transforming As EventHandler

事件類型

EventHandler

範例

下列程式碼範例示範如何使用 XmlDataSource 控制項搭配 TreeView 控制項來顯示已轉換的 XML 資料。 XML 轉換是使用 屬性所 TransformFile 指示的樣式表單來執行。 此外，樣式表單會使用在執行時間傳遞至 資料來源控制項的 XsltArgumentList 轉換引數。 程式碼範例示範如何使用自訂事件處理常式處理 Transforming 事件，將 物件傳遞 XsltArgumentList 至資料來源控制項。

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Xml.Xsl" %>


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
private void TransformEventHandler(object sender, EventArgs e) {

  // Add a dynamic transformation argument.
  DateTime d = new DateTime();
  d = DateTime.Now.AddDays(20);

  // Create an XsltArgumentList.
  XsltArgumentList xslArg = new XsltArgumentList();
  xslArg.AddParam("purchdate", "", d.ToShortDateString());

  ((XmlDataSource) sender).TransformArgumentList = xslArg;
}
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">
      <asp:XmlDataSource
        id="XmlDataSource1"
        runat="server"
        datafile="bookstore.xml"
        transformfile="bookswithdiscount.xsl"
        ontransforming="TransformEventHandler" />

        <!- TreeView uses hierachical data, so the
            XmlDataSource uses an XmlHierarchicalDataSourceView
            when a TreeView is bound to it. -->

      <asp:treeview
        id="TreeView1"
        runat="server"
        datasourceid="XmlDataSource1">
        <databindings>
          <asp:treenodebinding Depth="1" datamember="genre"
            textfield="name" valuefield="name"/>
          <asp:treenodebinding depth="2" datamember="book"
            textfield="title" valuefield="title"/>
          <asp:treenodebinding depth="3" datamember="chapter"
            textfield="name" valuefield="num"/>
        </databindings>
      </asp:treeview>

    </form>
  </body>
</html>

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Xml.Xsl" %>

<script runat="server">
Private Sub TransformEventHandler(sender As Object, e as EventArgs)

  ' Add a dynamic transformation argument.
  Dim d As New DateTime
  d = DateTime.Now.AddDays(20)

  'Create an XsltArgumentList.
  Dim xslArg As XsltArgumentList = New XsltArgumentList
  xslArg.AddParam("purchdate", "", d.ToShortDateString())

  Dim aXmlDataSource as XmlDataSource = CType(sender, XmlDataSource)
  aXmlDataSource.TransformArgumentList = xslArg

End Sub ' TransformEventHandler
</script>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <asp:xmldatasource
        id="XmlDataSource1"
        runat="server"
        datafile="bookstore.xml"
        transformfile="bookswithdiscount.xsl"
        ontransforming="TransformEventHandler" />

        <!- TreeView uses hierachical data, so the
            XmlDataSource uses an XmlHierarchicalDataSourceView
            when a TreeView is bound to it. -->

      <asp:treeview
        id="TreeView1"
        runat="server"
        datasourceid="XmlDataSource1">
        <databindings>
          <asp:treenodebinding depth="1" datamember="genre"
            textfield="name" valuefield="name"/>
          <asp:treenodebinding depth="2" datamember="book"
            textfield="title" valuefield="title"/>
          <asp:treenodebinding depth="3" datamember="chapter"
            textfield="name" valuefield="num"/>
        </databindings>
      </asp:treeview>

    </form>
  </body>
</html>

程式碼範例中的 XML 檔案具有下列資料：

<bookstore>  
   <genre name="fiction">  
     <book ISBN="0000000000">  
       <title>Secrets of Silicon Valley</title>  
       <price>12.95</price>  
       <chapters>  
         <chapter num="1" name="Introduction" />             
         <chapter num="2" name="Body" />            
         <chapter num="3" name="Conclusion" />  
       </chapters>  
     </book>  
   </genre>  
   <genre name="novel">  
     <book genre="novel" ISBN="1111111111">  
       <title>Straight Talk About Computers</title>  
       <price>24.95</price>  
       <chapters>  
         <chapter num="1" name="Introduction" />   
         <chapter num="2" name="Body" />  
         <chapter num="3" name="Conclusion" />  
       </chapters>  
     </book>  
   </genre>  
</bookstore>

XML 資料的轉換是使用下列樣式表單來執行：

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">  
 <xsl:param name="purchdate"/>  
 <xsl:template match="bookstore">  
   <bookstore>  
     <xsl:apply-templates select="genre"/>  
   </bookstore>  
 </xsl:template>  
 <xsl:template match="genre">  
   <genre>  
     <xsl:attribute name="name">  
       <xsl:value-of select="@name"/>  
     </xsl:attribute>  
     <xsl:apply-templates select="book"/>  
   </genre>  
 </xsl:template>  
 <xsl:template match="book">  
   <book>  
     <xsl:attribute name="ISBN">  
       <xsl:value-of select="@ISBN"/>  
     </xsl:attribute>  
     <xsl:attribute name="title">  
       <xsl:value-of select="title"/>  
       Price: <xsl:value-of select="price"/>  
           15% discount if purchased by: <xsl:value-of select="$purchdate"/>        
     </xsl:attribute>  
     <xsl:apply-templates select="chapters/chapter" />  
   </book>  
 </xsl:template>  
 <xsl:template match="chapter">  
   <chapter>  
     <xsl:attribute name="num">  
       <xsl:value-of select="@num"/>  
     </xsl:attribute>  
     <xsl:attribute name="name">  
       <xsl:value-of select="@name"/>  
     </xsl:attribute>  
     <xsl:apply-templates/>  
   </chapter>  
 </xsl:template>  
</xsl:stylesheet>

備註

Transforming處理 事件，以在控制項執行 XML 轉換之前 XmlDataSource ，使用 XsltArgumentList 物件設定 TransformArgumentList 屬性。

如需如何處理事件的詳細資訊，請參閱 處理和引發事件。

適用於

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