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31.4.1 URI
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C#高级编程（第3版）【全文连载】
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31.4.1 URI
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2006-10-13 14:41:00
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<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='100165784.htm'>31.3 把输出结果显示为HTML页面</a></div><div style='float:left;width:49%'>·<a href='100165785.htm'>31.4 实用工具类</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 style='float:left;width:49%'>·<a href='100165789.htm'>31.5 较低层的协议</a></div><div style='float:right;width:49%'>·<a href='100165790.htm'>31.6 小结</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;margin-left:
0cm'><a FTEL="_Toc535009264"></a><a FTEL="_Toc507815536"><span lang=EN-US>31.4.1
URI</span></a></h3>
<p class=MsoNormal><span lang=EN-US>Uri</span><span style='font-family:宋体'>和</span><span
lang=EN-US>UriBuilder</span><span style='font-family:宋体'>是</span><span
lang=EN-US>System(</span><span style='font-family:宋体'>注意：不是</span><span
lang=EN-US>System.Net)</span><span style='font-family:宋体'>命名空间中的两个类，它们都用于表示</span><span
lang=EN-US>URI</span><span style='font-family:宋体'>。</span><span lang=EN-US>UriBuilder</span><span
style='font-family:宋体'>允许把给定的字符串当作</span><span lang=EN-US>URI</span><span
style='font-family:宋体'>的组成部分，从而建立一个</span><span lang=EN-US>URI</span><span
style='font-family:宋体'>，而</span><span lang=EN-US>Uri</span><span
style='font-family:宋体'>允许分析、组合和比较</span><span lang=EN-US>URI</span><span
style='font-family:宋体'>。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>对于</span><span lang=EN-US>Uri</span><span
style='font-family:宋体'>类，构造函数需要一个完整的</span><span lang=EN-US>URI</span><span
style='font-family:宋体'>字符串：</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>Uri MSPage = new </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>
Uri("http://www.Microsoft.com/SomeFolder/SomeFile.htm?Order=true");</span></p>
<p class=MsoNormal><span lang=EN-US>Uri</span><span style='font-family:宋体'>类给出了许多只读属性。当</span><span
lang=EN-US>Uri</span><span style='font-family:宋体'>对象构造出来之后，它就不能修改了。</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>string Query =
MSPage.Query;
// Order=true;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>string
AbsolutePath = MSPage.AbsolutePath; //
SomeFolder/SomeFile.htm</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>string
Scheme =
MSPage.Scheme;
// http</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>int
Port =
MSPage.Port;
// 80 (the default for http)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>string
Host =
MSPage.Host;
// www.Microsoft.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>bool IsDefaultPort =
MSPage.IsDefaultPort; // true since 80 is
default</span></p>
<p class=MsoNormal><span style='font-family:宋体'>另一方面，</span><span lang=EN-US>UriBuilder</span><span
style='font-family:宋体'>类的属性较少：只允许建立完整的</span><span lang=EN-US>URI</span><span
style='font-family:宋体'>。这些属性是可读写的。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>可以给构造函数提供建立</span><span
lang=EN-US>URI</span><span style='font-family:宋体'>所需的各个组成部分：</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>Uri MSPage = new </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> UriBuilder("http",
"www.Microsoft.com", 80, "SomeFolder/SomeFile.htm")</span></p>
<p class=MsoNormal><span style='font-family:宋体'>或者把值赋给属性，建立</span><span
lang=EN-US>URI</span><span style='font-family:宋体'>的组成部分。</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>UriBuilder MSPage = new UriBuilder();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>MSPage.Scheme
="http";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>MSPage.Host
= "www.Microsoft.com";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>MSPage.Port
= 80;</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>MSPage.Path =
"SomeFolder/SomeFile.htm";</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在完成</span><span lang=EN-US>UriBuilder</span><span
style='font-family:宋体'>的初始化后，就可以使用</span><span lang=EN-US>Uri</span><span
style='font-family:宋体'>属性获得相应的</span><span lang=EN-US>Uri</span><span
style='font-family:宋体'>对象。</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>Uri CompletedUri =
MSPage.Uri;</span></p>
<p class=a3 style='margin-top:8.15pt;FTEL:21.45pt'><span lang=EN-US>DisplayPage</span><span
style='font-family:黑体'>示例</span></p>
<p class=MsoNormal><span style='font-family:宋体'>下面的示例</span><span lang=EN-US>DisplayPage</span><span
style='font-family:宋体'>将阐明</span><span lang=EN-US>UriBuilder</span><span
style='font-family:宋体'>的用法和如何创建</span><span lang=EN-US>Internet Explorer</span><span
style='font-family:宋体'>进程。这个示例允许用户键入</span><span lang=EN-US>URL</span><span
style='font-family:宋体'>的组成部分。注意，这里使用的是</span><span lang=EN-US>URL</span><span
style='font-family:宋体'>，而不是</span><span lang=EN-US>URI</span><span
style='font-family:宋体'>，因为这是一个</span><span lang=EN-US>HTTP</span><span
style='font-family:宋体'>请求。然后，用户可以单击</span><span lang=EN-US>View Page</span><span
style='font-family:宋体'>按钮，此时，应用程序将把完整的</span><span lang=EN-US>URL</span><span
style='font-family:宋体'>显示在文本框中，并用</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>浏览器</span><span lang=EN-US>ActiveX</span><span
style='font-family:宋体'>控件显示页面。该示例是标准的</span><span lang=EN-US>C# Windows</span><span
style='font-family:宋体'>应用程序，它的结果如图</span><span lang=EN-US>31-6</span><span
style='font-family:宋体'>所示。</span></p>
<p align=center><span lang=EN-US><img width=332 height=203
src="31/image007.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US> 31-6</span></p>
<p class=MsoNormal><span style='font-family:宋体'>文本框分别命名为</span><span
lang=EN-US>textBoxServer</span><span style='font-family:宋体'>、</span><span
lang=EN-US>textBoxPath</span><span style='font-family:宋体'>、</span><span
lang=EN-US>textBoxPort</span><span style='font-family:宋体'>和</span><span
lang=EN-US>textBoxURI</span><span style='font-family:宋体'>。为这个示例添加的代码全都在</span><span
lang=EN-US>ViewPage</span><span style='font-family:宋体'>按钮的事件处理程序中。</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>private void ViewPage_Click (object sender, System.EventArgs e)</span></p>
<p class=2 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>
UriBuilder Address = new UriBuilder();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Address.Host = txtBoxServer.Text;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Address.Port = int.Parse(txtBoxPort.Text);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Address.Scheme = Uri.UriSchemeHttp;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Address.Path = txtBoxPath.Text;</span></p>
<p class=2 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>
Uri AddressUri = Address.Uri;</span></p>
<p class=2 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>
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>
txtBoxURI.Text = AddressUri.ToString();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
myProcess.StartInfo.Arguments = AddressUri.ToString();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
myProcess.Start();</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>}</span></p>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165786.htm'><font color='red'>31.4.1 URI</font></a></h1>
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<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='100165784.htm'>31.3 把输出结果显示为HTML页面</a></div><div style='float:left;width:49%'>·<a href='100165785.htm'>31.4 实用工具类</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 style='float:left;width:49%'>·<a href='100165789.htm'>31.5 较低层的协议</a></div><div style='float:right;width:49%'>·<a href='100165790.htm'>31.6 小结</a></div></div>
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