DropDownList 绑定 XML 和 DropDownList 绑定 XML 数据并进行联动的例子

作者：孟宪会阅读：2066 发表于：2010-10-21 14:08:24

默认情况下，绑定 XML 数据格式，是属性，要绑定节点，需要编写 XLST 进行转换，或者使用 XPath() 方法进行选择。下面就是绑定 XML 文件的例子。

aa.xml 代码

a.xml 代码

<?xml version="1.0" encoding="utf-8" ?>
<root>
  <item>
    <value>HeNan</value>
    <text>河南</text>
  </item>
  <item>
    <value>Beijing</value>
    <text>北京</text>
  </item>
  <item>
    <value>Chongqing</value>
    <text>重庆</text>
  </item>
</root>

c.xsl 代码

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" omit-xml-declaration="yes" version="1.0" />
  <xsl:template match="/node()">
    <xsl:element name="{local-name()}">
      <xsl:for-each select="child::node()">
        <xsl:element name="{local-name()}">
          <xsl:for-each select="child::node()">
            <xsl:attribute name="{local-name()}">
              <xsl:value-of select="."/>
            </xsl:attribute>
          </xsl:for-each>
        </xsl:element>
      </xsl:for-each>
    </xsl:element>
  </xsl:template>
</xsl:stylesheet>

ASPX 代码

<%@ 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">
  protected void Page_Load(object sender, EventArgs e)
  {
    //直接绑定的例子
    XmlDataSource XmlDataSource1 = new XmlDataSource();
    XmlDataSource1.DataFile = "~/aa.xml";
    XmlDataSource1.ID = "XmlDataSource1";
    form1.Controls.Add(XmlDataSource1);
    DropDownList1.DataSourceID = "XmlDataSource1";
    DropDownList1.DataTextField = "id";
    DropDownList1.DataValueField = "value";

    //数据过滤的例子
    XmlDataSource XmlDataSource2 = new XmlDataSource();
    XmlDataSource2.ID = "XmlDataSource2";
    XmlDataSource2.DataFile = "~/aa.xml";
    XmlDataSource2.XPath = "countrys/country[@id='China']/city";
    form1.Controls.Add(XmlDataSource2);
    DropDownList2.DataSourceID = "XmlDataSource2";
    DropDownList2.DataTextField = "id";
    DropDownList2.DataValueField = "value";

    //绑定节点而不是属性的例子
    XmlDataSource XmlDataSource3 = new XmlDataSource();
    XmlDataSource3.ID = "XmlDataSource3";
    XmlDataSource3.DataFile = "~/a.xml";
    XmlDataSource3.TransformFile = "~/c.xsl";
    form1.Controls.Add(XmlDataSource3);
    DropDownList3.DataSourceID = "XmlDataSource3";
    DropDownList3.DataTextField = "text";
    DropDownList3.DataValueField = "value";
  }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
  <title></title>
</head>
<body>
  <form id="form1" runat="server">
  <asp:DropDownList ID="DropDownList1" runat="server">
  </asp:DropDownList>
  <asp:DropDownList ID="DropDownList2" runat="server">
  </asp:DropDownList>
   <asp:DropDownList ID="DropDownList3" runat="server">
  </asp:DropDownList>
  </form>
</body>
</html>

下面这个例子是进行联动的例子：

City.xml 代码

<?xml version="1.0" encoding="utf-8"?>
<Cities>
  <City text="北京" value="bj">
    <District value="haidian" text="海淀区"></District>
    <District value="changping" text="昌平区"></District>
    <District value="chaoyang" text="朝阳区"></District>
    <District value="pinggu" text="平谷区"></District>
  </City>
  <City text="上海" value="sh">
    <District value="pudong" text="浦东区"></District>
    <District value="xuhui" text="徐汇区"></District>
  </City>
  <City text="郑州" value="zz">
    <District value="erqi" text="二七区"></District>
    <District value="huiji" text="惠济区"></District>
    <District value="jinshui" text="金水区"></District>
  </City>
</Cities>

ASPX 代码

<%@ Page Language="C#" EnableViewState="false" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  protected void City_SelectedIndexChanged(object sender, EventArgs e)
  {
    if (this.City.SelectedValue == "")
    {
      District.Items.Clear();
    }
    else
    {
      District.DataSourceID = "XmlDistrict";
      XmlDistrict.XPath = "Cities/City[@value='" + this.City.SelectedValue + "']/District";
      District.DataTextField = "text";
      District.DataValueField = "value";
    }
  }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title></title>
</head>
<body>
  <form id="form1" runat="server">
  <asp:DropDownList ID="City" runat="server" OnSelectedIndexChanged="City_SelectedIndexChanged"
    DataTextField="text" DataValueField="value" DataSourceID="XmlCity" AutoPostBack="true"
    AppendDataBoundItems="true">
    <asp:ListItem Value="">-- 请选择城市 --</asp:ListItem>
  </asp:DropDownList>
  <asp:DropDownList ID="District" runat="server">
  </asp:DropDownList>
  <asp:XmlDataSource ID="XmlCity" runat="server" DataFile="~/City.xml"></asp:XmlDataSource>
  <asp:XmlDataSource ID="XmlDistrict" runat="server" DataFile="~/City.xml"></asp:XmlDataSource>
  </form>
</body>
</html>

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