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一个ASP.NET+XML留言本例子

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-11-03   浏览: 25 ::
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  viewpost.aspx--察看提交的留言
viewguestbook.aspx--察看所有留言
Header.inc
guestpost.aspx--留言表单及XML写操作
Footer.inc
Guest.xml--XML数据

源代码如下：

viewguestbook.aspx
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Data" %>
<%@ Assembly Name="System.Xml" %>
<%@ Import Namespace="System.Xml" %>
<%@ Page Language="C<%-- Needed Assembiles --%>

<html>
<head>
<title>Welcome to Saurabh's GuestBook.</title>
<script language="C //run the script when the Page is Loaded
public void Page_Load(Object sender, EventArgs e)
{
// an label , its use stated later
tryagain :

//the path to the Xml file which will contain all the data
//modify this if you have any other file or directory mappings.
//modify this if you have been directed here from Step 2 of the ReadMe file.
string datafile = "db/guest.xml" ;

//try-Catch block to read from an XML file
try
{
//make an instance to the XMLDataDocument class
//this class can read from an xml file in and ordered format
XmlDataDocument datadoc = new XmlDataDocument();

// Infer the DataSet schema from the XML data and load the XML Data
datadoc.DataSet.ReadXml(new StreamReader(Server.MapPath(datafile)));

//Databind the first table in the Dataset to the Repeter
MyDataList.DataSource = datadoc.DataSet.Tables[0].DefaultView;
MyDataList.DataBind();

//free up the XML file to be used by other programs
datadoc=null;


}
catch(IOException ed)
{
// Here I am for now trying to overcome a bug in my guestbook exapmle
//the Bug is that only one class can either read or write to my XML
// data file at a time.
//If the file is being used my some some other page (eg the guest book viewing page)
// then an IOException will be thrown
// So to handle such situtations what we do is that
// If an IOException is thrown the page goes again to the tryagain label
//and tries to write again into the xml file
//this goes on till finally the resource is freed and the xml file is written to.

goto tryagain ;
}
catch (Exception edd)
{
//catch any other exceptions that occur
errmess.Text="Cannot read from XML file because "+edd.ToString() ;
}



}


</script>
<LINK href="mystyle.css" type=text/css rel=stylesheet>

</head>
<body topmargin="0" leftmargin="0" marginwidth="0" marginheight="0" rightmargin="0">
<!-- <asp:label id="errmess" text="" style="color:<br>
<h3 align="center" class="newsbody">My Guestbook.</h3>
<ASP:Repeater id="MyDataList" runat="server">

<template name="headertemplate">

<table class="mainheads" width="100%" style="font: 8pt verdana">
<tr style="background-color: <th>
Name
</th>
<th>
Country
</th>
<th>
Email
</th>
<th>
Comments
</th>
<th>
Date/Time
</th>
</tr>

</template>

<template name="itemtemplate">

<tr style="background-color: <td>
<% </td>
<td>
<% </td>
<td>
<% </td>
<td>
<% </td>
<td>
<% </td>
</tr>

</template>

<template name="footertemplate">

</table>

</template>

</ASP:Repeater>

<!-- </body>
</html>


viewpost.aspx
<