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25.2 ASP.NET Web窗体(3)
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C#高级编程（第3版）
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25.2 ASP.NET Web窗体(3)
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2006-10-13 14:41:00
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图书导读
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<h1 id="divCurrentNode" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165682.htm'><font color='red'>25.2 ASP.NET Web窗体(3)</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165679.htm'>25.1 ASP.NET概述</a></div><div style='float:right;width:49%'>·<a href='100165680.htm'>25.2 ASP.NET Web窗体(1)</a></div><div style='float:left;width:49%'>·<a href='100165681.htm'>25.2 ASP.NET Web窗体(2)</a></div><div style='float:right;width:49%'>·<a href='100165683.htm'>25.3 ADO.NET和数据绑定</a></div><div style='float:left;width:49%'>·<a href='100165684.htm'>25.3.1 更新会议登记应用程序(1)</a></div><div style='float:right;width:49%'>·<a href='100165685.htm'>25.3.1 更新会议登记应用程序(2)</a></div></div>
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<p class=MsoNormal><span style='font-family:宋体'>下面举一个简单的示例，为一个</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>应用程序</span><span lang=EN-US>(</span><span
style='font-family:宋体'>会议室登记工具</span><span lang=EN-US>)</span><span
style='font-family:宋体'>创建构架。与本书的其他示例一样，可以从</span><span lang=EN-US>Wrox</span><span
style='font-family:宋体'>网站</span><span lang=EN-US>www.wrox.com</span><span
style='font-family:宋体'>上下载示例应用程序的代码。现在仅介绍前端和简单的事件处理，后面将使用</span><span
lang=EN-US>ADO.NET</span><span style='font-family:宋体'>和数据绑定扩展这个示例，使之包含服务器端的事务逻辑。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>要创建的</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>窗体包含的字段有：用户名、事件名、会议室和参加者，以及可从中选择日期的一个日历。除了日历外，所有的字段都使用验证控件，日历在服务器端验证，并提供一个默认日期，以防没有输入日期。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>对于</span><span lang=EN-US>UI</span><span
style='font-family:宋体'>测试，窗体上也提供了一个</span><span lang=EN-US>Label</span><span
style='font-family:宋体'>控件，使用它可以显示提交的结果。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>首先，在</span><span lang=EN-US>Visual
Studio .NET</span><span style='font-family:宋体'>中创建一个新的</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>应用程序，命名为</span><span lang=EN-US>PCSWebApp2</span><span
style='font-family:宋体'>。然后设计窗体，该窗体是使用</span><span lang=EN-US>WebForm1.aspx</span><span
style='font-family:宋体'>中的下述代码生成的</span><span lang=EN-US>(</span><span
style='font-family:宋体'>自动生成的代码没有高亮显示</span><span lang=EN-US>)</span><span
style='font-family:宋体'>：</span></p>
<p class=a6 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US><%@ Page language="c#"
Codebehind="WebForm1.aspx.cs" AutoEventWireup="false"</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
Inherits="PCSWebApp2.WebForm1" %></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0
Transitional//EN" ></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> </span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US><html></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <head></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <title>WebForm1</title></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <meta FTEL="GENERATOR"
Content="Microsoft Visual Studio 7.1"></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <meta FTEL="CODE</span><span
lang=EN-US style='font-family:"Baskerville BE Regular"'>_</span><span
lang=EN-US>LANGUAGE" Content="C#"></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <meta FTEL="vs</span><span
lang=EN-US style='font-family:"Baskerville BE Regular"'>_</span><span
lang=EN-US>defaultClientScript" content="JavaScript"></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <meta FTEL="vs</span><span
lang=EN-US style='font-family:"Baskerville BE Regular"'>_</span><span
lang=EN-US>targetSchema"</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> content="http://schemas.microsoft.com/intellisense/ie5"></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> </head></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <body MS</span><span lang=EN-US style='font-family:
"Baskerville BE Regular"'>_</span><span lang=EN-US>POSITIONING="GridLayout"></span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> </span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <form id="Form1"
method="post" Runat="server"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> <h1
align="center"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
Enter details and set a day to initiate an event.</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US> </h1></span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<br></span></p>
<p class=MsoNormal><span style='font-family:宋体'>页面的标题是用</span><span lang=EN-US>HTML</span><span
style='font-family:宋体'>标记</span><span lang=EN-US> <h1></span><span
style='font-family:宋体'>括起来的，以得到大型的标题格式的文本，之后，窗体的主体放在</span><span lang=EN-US>HTML</span><span
style='font-family:宋体'>标记</span><span lang=EN-US><table></span><span
style='font-family:宋体'>中。可以使用一个</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>服务器控件表格，但这会导致不必要的复杂性，因为使用表格的目的仅仅是为了格式化显示而已，不是用于动态的</span><span
lang=EN-US>UI</span><span style='font-family:宋体'>元素</span><span lang=EN-US>(</span><span
style='font-family:宋体'>在设计</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>窗体时，不要添加不必要的服务器控件</span><span lang=EN-US>)</span><span
style='font-family:宋体'>。这个表格有</span><span lang=EN-US>3</span><span
style='font-family:宋体'>列，第</span><span lang=EN-US>1</span><span
style='font-family:宋体'>列包含简单的文本标签，第</span><span lang=EN-US>2</span><span
style='font-family:宋体'>列包含对应于文本标签的</span><span lang=EN-US>UI</span><span
style='font-family:宋体'>字段</span><span lang=EN-US>(</span><span
style='font-family:宋体'>以及这些字段的验证控件</span><span lang=EN-US>)</span><span
style='font-family:宋体'>，第</span><span lang=EN-US>3</span><span
style='font-family:宋体'>列包含一个日期控件，可以从中选择日期，这个控件占用了</span><span lang=EN-US>4</span><span
style='font-family:宋体'>行。第</span><span lang=EN-US>5</span><span
style='font-family:宋体'>行包含一个跨越所有列的提交按钮，第</span><span lang=EN-US>6</span><span
style='font-family:宋体'>行包含一个</span><span lang=EN-US>ValidationSummary</span><span
style='font-family:宋体'>控件，在需要时可以显示错误信息</span><span lang=EN-US>(</span><span
style='font-family:宋体'>所有其他验证控件都设置了</span><span lang=EN-US>display=''none''</span><span
style='font-family:宋体'>，因为它们都使用这个汇总来显示错误</span><span lang=EN-US>)</span><span
style='font-family:宋体'>。在表的下面是一个简单的标签，使用它可以显示结果，以后我们还将添加数据库访问。</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US> <table
bordercolor="#000000" cellspacing="0"
cellpadding="8"</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
rules="none" align="center" bgcolor="#fff99e"
border="2"</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
width="540"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
<tr></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
<td valign="top">Your Name:</td></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
<td valign="top"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
<asp:TextBox ID="nameBox" Runat="server"
Width="160px"/></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
<asp:RequiredFieldValidator ID="validateName" </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
Runat="server"</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
ErrorMessage="You must enter a name."</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>
ControlToValidate="nameBox" </span></p>
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