日期:2012-05-29  浏览次数:20514 次

呵呵,有意思,听过一个笑话,说德国一个老头,是个聋子,在如厕时,突然苏联战机空袭,虽然房屋倒塌,可是全家人都没有事情,家里人扒开卫生间的墙壁,发现老头在那儿乐,说:我一拉抽水马桶的绳,屋就倒了。
哈哈哈,我也是这样,刚才我一发这贴子,chinaasp就完了,还以为是我的事情呢,原来是苏联飞机来炸了,呵呵。
如果你喜欢玩xml,那么请跟我来,但在此之前,请深呼一口气,因为我给大家介绍一个长代码,在这个代码中揭示了微软在ASP.NET架构中隐藏的一个WEB表单控件,即<asp:xml runat=server/>,我只给代码,不给解释,大家自己下课后去研究吧。
另外,由于是beta1,在这个控件中你使用的xslt里面不能使用<xsl:sort>,当然,亦不能使用那个order-by了,因为它支持的xsl空间是带"1999"的那个,而不是原来的那个。
另外,我从微软得到的回答就是在beta2里面,它将支持<xsl:sort>,到那时,哥哥我将全部转向xml+xsl了,现在为源代码保密问题给弄的非常头疼。
请看下例:
webform2.cs
---------------------------------
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Text;
using System.IO;
using System.Xml;

public class WebForm2 : Page
{
public StringBuilder outputQ;
public StringBuilder outputXml;
public DocumentNavigator nav = null;
public HtmlInputFile XmlFile;

public System.Web.UI.WebControls.Xml MyXml;

public System.Web.UI.WebControls.TextBox TextBox1;
public System.Web.UI.WebControls.TextBox TextBox2;
public System.Web.UI.WebControls.TextBox TextBox3;
public System.Web.UI.WebControls.Button Query;
public System.Web.UI.WebControls.Label FileLabel;

public void On_KeyUp(object sender, System.EventArgs e)
{
Response.Write("Works");
}

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//
// Evals true first time browser hits the page
//
}
}

public void Query_Click(object sender, System.EventArgs e)
{
HttpPostedFile xmlfile = XmlFile.PostedFile;
XmlDocument doc = new XmlDocument();
MyXml.Document = new XmlDocument();
// TextBox2.Text="";
// TextBox3.Text="";

if (xmlfile.FileName != String.Empty)
{
try
{
FileLabel.Text= xmlfile.FileName;

MyXml.Document.Load(xmlfile.FileName);
outputXml = new StringBuilder();
XmlTextReader reader = new XmlTextReader (xmlfile.FileName);
ShowDocument();
TextBox3.Text = outputXml.ToString();

outputQ = new StringBuilder();
doc.Load(xmlfile.FileName);
DocumentNavigator nav = new DocumentNavigator(doc);
// Perform the query e.g. "descendant::book/price"
XPathQuery(nav, TextBox1.Text);
TextBox2.Text = outputQ.ToString();

}
catch (Exception exp) {
//outputQ.Append("</xmp><font color=\"#FF6600\">"+ exp.Message+"</font><xmp>");
}
finally {}
}
else if (FileLabel.Text != String.Empty)
{
try
{
MyXml.Document.Load(FileLabel.Text);
outputXml = new StringBuilder();
XmlTextReader reader = new XmlTextReader (FileLabel.Text);
ShowDocument();
TextBox3.Text = outputXml.ToString();

ShowDocument();

outputQ = new StringBuilder();
doc.Load(FileLabel.Text);
DocumentNavigator nav = new DocumentNavigator(doc);
// Perform the query e.g. "descendant::book/price"
XPathQuery(nav, TextBox1.Text);
TextBox2.Text = outputQ.ToString();

}
catch (Exception exp) {
outputQ.Append("</xmp><font color=\"#FF6600\">"+ exp.Message+"</font><xmp>");
}
finally {}
}
}

private void XPathQuery(XmlNavigator navigator, String xpathexpr )
{
try
{
// Save context node position
navigator.PushPosition();
navigator.Select (xpathexpr);
FormatXml(navigator);

// Restore context node position
navigator.PopPosition();
}
catch (Exception e)
{
}
}

//***************************** Navigator ************************************
private void FormatXml (XmlNavigator navigator)
{
while (navigator.MoveToNextSelected())
{
switch