Editare

Partajați prin

XmlDataSource.DataFile Property

  • Reference

Definition

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

Specifies the file name of an XML file that the data source binds to.

public:
 virtual property System::String ^ DataFile { System::String ^ get(); void set(System::String ^ value); };
public virtual string DataFile { get; set; }
member this.DataFile : string with get, set
Public Overridable Property DataFile As String

Property Value

String

The absolute physical path or relative path of the XML file that contains data that the XmlDataSource control represents. The default value is Empty.

Exceptions

InvalidOperationException

The document is loading.

Examples

The following code example demonstrates how to use an XmlDataSource control to display XML data contained in a file with a TreeView control.

<%@ Page Language="C#" %>
<!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="books.xml" />

      <!- 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 datamember="book" textfield="title"/>
        </databindings>
      </asp:TreeView>

    </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">

<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="books.xml" />

      <!- 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 datamember="book" textfield="title"/>
        </databindings>
      </asp:TreeView>

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

The XML file in the code example has the following data:

<books>  
   <computerbooks>  
     <book title="Secrets of Silicon Valley" author="Sheryl Hunter"/>  
     <book title="Straight Talk About Computers" author="Dean Straight"/>  
     <book title="You Can Combat Computer Stress!" author="Marjorie Green"/>                  
   </computerbooks>  
   <cookbooks>  
     <book title="Silicon Valley Gastronomic Treats" author="Innes del Castill"/>  
   </cookbooks>  
</books>

Remarks

If both the DataFile and Data properties are set, the DataFile property takes precedence and the data in the XML file is used instead of the XML data specified in the Data property.

If you change the value of the DataFile property, the DataSourceChanged event is raised. If caching is enabled and you change the value of DataFile, the cache is invalidated.

Applies to

See also