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31.3 把输出结果显示为HTML页面
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C#高级编程（第3版）【全文连载】
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31.3 把输出结果显示为HTML页面
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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='100165784.htm'><font color='red'>31.3 把输出结果显示为HTML页面</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165781.htm'>31.1.2 基本的Web客户示例</a></div><div style='float:right;width:49%'>·<a href='100165782.htm'>31.1.3 上传文件</a></div><div style='float:left;width:49%'>·<a href='100165783.htm'>31.2 WebRequest类和WebResponse类</a></div><div style='float:right;width:49%'>·<a href='100165785.htm'>31.4 实用工具类</a></div><div style='float:left;width:49%'>·<a href='100165786.htm'>31.4.1 URI</a></div><div style='float:right;width:49%'>·<a href='100165787.htm'>31.4.2 IP地址和DNS名称</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:11.4pt;margin-right:0cm;FTEL:11.4pt;margin-left:
0cm'><a FTEL="_Toc535009262"></a><a FTEL="_Toc507815533"><span lang=EN-US>31.3 </span></a><span
style='font-family:楷体_GB2312'>把输出结果显示为</span><span lang=EN-US>HTML</span><span
style='font-family:楷体_GB2312'>页面</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>第一个示例说明了</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>基类可以从</span><span
lang=EN-US>Internet</span><span style='font-family:宋体'>上下载和处理数据。但是，迄今为止，从</span><span
lang=EN-US>Internet</span><span style='font-family:宋体'>上下载的文件都是以纯文本显示的。人们总是希望以</span><span
lang=EN-US>Internet Explorer</span><span style='font-family:宋体'>的界面样式查看</span><span
lang=EN-US>HTML</span><span style='font-family:宋体'>文件，以便可以看到</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>文档的实际面貌。遗憾的是，</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>基类并不包含对</span><span
lang=EN-US>Internet Explorer</span><span style='font-family:宋体'>界面样式的控件的内在支持。我们需要编程调用</span><span
lang=EN-US>Internet Explorer</span><span style='font-family:宋体'>，或者把</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>浏览器用作</span><span lang=EN-US>ActiveX</span><span
style='font-family:宋体'>控件。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>使用</span><span lang=EN-US>System.Diagnostics</span><span
style='font-family:宋体'>命名空间中的</span><span lang=EN-US>Process</span><span
style='font-family:宋体'>类，可以编程打开</span><span lang=EN-US>Internet Explorer</span><span
style='font-family:宋体'>过程，导航到给定的</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>页。</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>Process myProcess = new Process();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>myProcess.StartInfo.FileName
= "iexplore.exe";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>myProcess.StartInfo.Arguments
= "http://www.wrox.com";</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>myProcess.Start();</span></p>
<p class=MsoNormal><span style='font-family:宋体'>但是，上面的代码会把</span><span
lang=EN-US>IE</span><span style='font-family:宋体'>作为单独的窗口打开，而应用程序并没有与新窗口相连接，因此不能控制浏览器。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>另一方面，把浏览器作为</span><span
lang=EN-US>ActiveX</span><span style='font-family:宋体'>控件，可以把浏览器作为应用程序的一个集成部分来显示和控制。</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>浏览器控件相当复杂，提供了许多方法、属性和事件。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在采用这些控件时，最简单的方式就是使用</span><span
lang=EN-US> Visual Studio .NET</span><span style='font-family:宋体'>把这个控件添加到工具箱中。为此，右击</span><span
lang=EN-US>Visual Studio .NET</span><span style='font-family:宋体'>中的</span><span
lang=EN-US>Toolbox</span><span style='font-family:宋体'>，从弹出的关联菜单中选择</span><span
lang=EN-US>Customize Toolbox</span><span style='font-family:宋体'>，打开下面的对话框。在对话框中选择</span><span
lang=EN-US>COM Component</span><span style='font-family:宋体'>选项卡，选中</span><span
lang=EN-US>Microsoft Web Browser</span><span style='font-family:宋体'>，如图</span><span
lang=EN-US>31-3</span><span style='font-family:宋体'>所示。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>之后，</span><span lang=EN-US>Web
Browser</span><span style='font-family:宋体'>控件就会显示在工具箱中。然后，可以像使用其他的</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>控件一样，把它拖放到窗体上。</span><span
lang=EN-US>Visual Studio .NET</span><span style='font-family:宋体'>将自动生成把</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>浏览器控件保存在应用程序窗体中所需要的所有</span><span
lang=EN-US>COM </span><span style='font-family:宋体'>交互操作代码。下面用另一个示例</span><span
lang=EN-US>(</span><span style='font-family:宋体'>即</span><span lang=EN-US>DisplayWebPage)</span><span
style='font-family:宋体'>阐明这个技术，该示例将在一个典型的</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>窗体中显示一个从</span><span lang=EN-US>Internet</span><span
style='font-family:宋体'>上获得的</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>页。</span></p>
<p align=center><span lang=EN-US><img width=390 height=271
src="31/image003.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US> 31-3</span></p>
<p class=MsoNormal><span style='font-family:宋体'>我们把</span><span lang=EN-US>DisplayWebPage</span><span
style='font-family:宋体'>创建为标准的</span><span lang=EN-US>C# Windows</span><span
style='font-family:宋体'>应用程序，并且把</span><span lang=EN-US>Web Browser ActiveX</span><span
style='font-family:宋体'>控件拖放到窗体上。默认状态下，</span><span lang=EN-US>Visual Studio
.NET</span><span style='font-family:宋体'>把这个控件命名为</span><span lang=EN-US>axWebBrowser1</span><span
style='font-family:宋体'>，然后，把下面的代码添加到</span><span lang=EN-US>Form1</span><span
style='font-family:宋体'>构造函数中：</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>public Form1()</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
// Required for Windows Form Designer support</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
InitializeComponent();</span></p>
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