100165780.htm
来自「C#高级编程(第三版),顶死你们。。 。up」· HTM 代码 · 共 101 行
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31.1.1 下载文件
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C#高级编程（第3版）【全文连载】
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31.1.1 下载文件
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2006-10-13 14:41:00
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图书导读
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<div style='float:left;width:49%'>·<a href='100165777.htm'>30.4.3 SelfPlacingWindow示例</a></div><div style='float:right;width:49%'>·<a href='100165778.htm'>30.5 小结</a></div><div style='float:left;width:49%'>·<a href='100165779.htm'>31.1 WebClient类</a></div><div style='float:right;width:49%'>·<a href='100165781.htm'>31.1.2 基本的Web客户示例</a></div><div style='float:left;width:49%'>·<a href='100165782.htm'>31.1.3 上传文件</a></div><div style='float:right;width:49%'>·<a href='100165783.htm'>31.2 WebRequest类和WebResponse类</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="_Toc535009258"></a><a FTEL="_Toc507815529"><span lang=EN-US>31.1.1
</span></a><span style='font-family:黑体'>下载文件</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>使用</span><span lang=EN-US>WebClient</span><span
style='font-family:宋体'>类从</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>站点下载文件时有两种方法，具体使用哪一种方法取决于文件内容的处理方式。如果只想把文件保存到磁盘上，就应该调用</span><span
lang=EN-US>DownloadFile()</span><span style='font-family:宋体'>方法。这个方法有两个参数：即文件的</span><span
lang=EN-US>URI</span><span style='font-family:宋体'>和保存所请求的数据的位置</span><span
lang=EN-US>(</span><span style='font-family:宋体'>路径和文件名</span><span lang=EN-US>)</span><span
style='font-family:宋体'>：</span><span lang=EN-US> </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>WebClient Client = <span style='color:black'>new WebClient</span>();</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>Client.DownloadFile("http://www.Wrox.com/index.asp",
"index.htm");</span></p>
<p class=MsoNormal><span style='font-family:宋体'>更为常见的是，应用程序需要处理从</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>站点检索到的数据。为此，要使用</span><span
lang=EN-US>OpenRead()</span><span style='font-family:宋体'>方法，这个方法返回一个</span><span
lang=EN-US>Stream</span><span style='font-family:宋体'>引用。然后，就可以把数据从数据流中提取到内存中：</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><a
FTEL="_Toc535009259"></a><a FTEL="_Toc507815530"><span lang=EN-US>WebClient
Client = new WebClient();</span></a></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>Stream strm =
Client.OpenRead("http://www.Wrox.com/default.asp");</span></p>
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图书导读
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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='100165780.htm'><font color='red'>31.1.1 下载文件</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165777.htm'>30.4.3 SelfPlacingWindow示例</a></div><div style='float:right;width:49%'>·<a href='100165778.htm'>30.5 小结</a></div><div style='float:left;width:49%'>·<a href='100165779.htm'>31.1 WebClient类</a></div><div style='float:right;width:49%'>·<a href='100165781.htm'>31.1.2 基本的Web客户示例</a></div><div style='float:left;width:49%'>·<a href='100165782.htm'>31.1.3 上传文件</a></div><div style='float:right;width:49%'>·<a href='100165783.htm'>31.2 WebRequest类和WebResponse类</a></div></div>
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