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来自「C#高级编程(第三版),顶死你们。。 。up」· HTM 代码 · 共 118 行 · 第 1/2 页

<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.Formatting=Formatting.Indented;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteStartDocument();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; // Start creating elements and attributes</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteStartElement(&quot;book&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteAttributeString(&quot;genre&quot;,&quot;Mystery&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteAttributeString(&quot;publicationdate&quot;,&quot;2001&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteAttributeString(&quot;ISBN&quot;,&quot;123456789&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteElementString(&quot;title&quot;,&quot;The Case of the Missing Cookie&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteStartElement(&quot;author&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteElementString(&quot;name&quot;,&quot;Cookie Monster&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteEndElement();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteElementString(&quot;price&quot;,&quot;9.99&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteEndElement();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.WriteEndDocument();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; //clean up</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.Flush();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; tw.Close();</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">}</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 宋体">这里编写一个新的</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文件</span><span lang="EN-US">booknew.xml</span><span style="FONT-FAMILY: 宋体">，并给一本新书添加数据。注意</span><span lang="EN-US">XmlTextWriter</span><span style="FONT-FAMILY: 宋体">会用新文件重写旧文件。本章的后面会把一个新元素或节点插入到现有的文档中，使用</span><span lang="EN-US">FileStream</span><span style="FONT-FAMILY: 宋体">对象作为参数，实例化</span><span lang="EN-US">XmlTextWriter</span><span style="FONT-FAMILY: 宋体">对象。还可以把一个带有文件名和路径的字符串或者一个基于</span><span lang="EN-US">TextWriter</span><span style="FONT-FAMILY: 宋体">的对象作为参数。接着，设置</span><span lang="EN-US">Indenting</span><span style="FONT-FAMILY: 宋体">属性，之后，子节点就会自动从父节点缩进。</span><span lang="EN-US">WriteStartDocument()</span><span style="FONT-FAMILY: 宋体">会添加文档声明。下面开始写入数据。首先是</span><span lang="EN-US">book</span><span style="FONT-FAMILY: 宋体">元素，添加</span><span lang="EN-US">genre</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">publicationdate </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> ISBN</span><span style="FONT-FAMILY: 宋体">属性。然后写入</span><span lang="EN-US">title</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">author</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">price</span><span style="FONT-FAMILY: 宋体">元素，注意</span><span lang="EN-US">author</span><span style="FONT-FAMILY: 宋体">元素有一个子元素名。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 宋体">单击按钮，生成</span><span lang="EN-US">booknew.xml</span><span style="FONT-FAMILY: 宋体">文件：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">&lt;?xml version=&quot;1.0&quot;?&gt;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&lt;book genre=&quot;Mystery&quot; publicationdate=&quot;2001&quot; ISBN=&quot;123456789&quot;&gt;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp; &lt;title&gt;The Case of the Missing Cookie&lt;/title&gt;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp; &lt;author&gt;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp; &lt;name&gt;Cookie Monster&lt;/name&gt;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp; &lt;/author&gt;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; LINE-HEIGHT: 13pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp; &lt;price&gt;9.99&lt;/price&gt;</span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">&lt;/book&gt;</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 宋体">在开始和结束写入元素和属性时，要注意控制元素的嵌套。在给</span><span lang="EN-US">authors</span><span style="FONT-FAMILY: 宋体">元素添加</span><span lang="EN-US">name</span><span style="FONT-FAMILY: 宋体">子元素时，就可以看到这种嵌套。注意</span><span lang="EN-US">WriteStartElement()</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> WriteEndElement()</span><span style="FONT-FAMILY: 宋体">方法调用是如何安排的，以及它们是如何在输出文件中生成嵌套的元素的。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 宋体">除了</span><span lang="EN-US">WriteElementString ()</span><span style="FONT-FAMILY: 宋体">和</span> <span lang="EN-US">WriteAttributeString()</span><span style="FONT-FAMILY: 宋体">方法外，还有其他几个专用的写入方法。</span><span lang="EN-US">WriteCData()</span><span style="FONT-FAMILY: 宋体">可以输出一个</span><span lang="EN-US">Cdata</span><span style="FONT-FAMILY: 宋体">部分</span><span lang="EN-US">(&lt;!CDATA[&hellip;])&gt;)</span><span style="FONT-FAMILY: 宋体">，把要写入的文本作为一个参数。</span><span lang="EN-US">WriteComment()</span><span style="FONT-FAMILY: 宋体">以正确的</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">格式写入注释。</span><span lang="EN-US">WriteChars()</span><span style="FONT-FAMILY: 宋体">写入字符缓冲区的内容，其工作方式类似于前面的</span><span lang="EN-US">ReadChars()</span><span style="FONT-FAMILY: 宋体">，它们都使用相同类型的参数。</span><span lang="EN-US">WriteChar()</span><span style="FONT-FAMILY: 宋体">需要一个缓冲区</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">一个字符数组</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">、写入的起始位置</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">一个整数</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">和要写入的字符个数</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">一个整数</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 宋体">使用基于</span><span lang="EN-US">XmlReader </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> XmlWriter</span><span style="FONT-FAMILY: 宋体">的类读写</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">是非常灵活的，使用起来也很简单。下面介绍如何使用</span><span lang="EN-US">System.Xml</span><span style="FONT-FAMILY: 宋体">命名空间中</span><span lang="EN-US">XmlDocument </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> XmlNode</span><span style="FONT-FAMILY: 宋体">类执行</span><span lang="EN-US">DOM</span><span style="FONT-FAMILY: 宋体">。</span></p></div>
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