100165608.htm
来自「C#高级编程(第三版),顶死你们。。 。up」· HTM 代码 · 共 343 行 · 第 1/4 页
HTM
343 行
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>
21.6 XML模式
</title></head>
<body>
<div class="area">
<div class="col1">
<div class="lineBlue">
</div>
<!-- title -->
<div class="arcTitle">
<h1>
<a href="../16">
C#高级编程（第3版）
</a>
</h1>
<div style="text-align: center; font-size: 15px">
<a href="100165608.htm">
21.6 XML模式
</a>
</div>
<div style="text-align: center; font-size: 15px">
<a class="url" href="../../default.htm">http://book.csdn.net/</a>
2006-10-13 14:41:00
</div>
<div style="margin: 0px auto; width: 700px; border: solid 1px #0b5f98;">
<div style="float: left; width: 16px; background-color: #0b5f98; color: White; padding: 1px;">
图书导读
</div>
<div style="float: right; width: 670px; text-align: left; line-height: 16pt; padding-left: 2px">
<!--导读-->
<h1 id="divCurrentNode" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165608.htm'><font color='red'>21.6 XML模式</font></a></h1>
<div id="divRelateNode" style="padding-left: 2px">
<div style='float:left;width:49%'>·<a href='100165605.htm'>21.5.2 数据列</a></div><div style='float:right;width:49%'>·<a href='100165606.htm'>21.5.3 数据关系</a></div><div style='float:left;width:49%'>·<a href='100165607.htm'>21.5.4 数据约束</a></div><div style='float:right;width:49%'>·<a href='100165609.htm'>21.7 填充数据集</a></div><div style='float:left;width:49%'>·<a href='100165610.htm'>21.7.1 用数据适配器来填充 DataSet</a></div><div style='float:right;width:49%'>·<a href='100165611.htm'>21.7.2 从XML中给数据集填充数据</a></div></div>
</div>
</div>
</div>
<!-- main -->
<div id="main">
<div id="text">
<div id="csdn_zhaig_ad_yahoo_2"></div>
<link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 11.4pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 11.4pt"><a ftel="_Toc507815168"><span lang="EN-US">21.6 XML</span></a><span style="FONT-FAMILY: 楷体_GB2312">模式</span></h3>
<p class="MsoNormal"><a ftel="schemasXML"></a><a ftel="XSD"><span lang="EN-US">XML</span></a><span style="FONT-FAMILY: 宋体">已经在</span><span lang="EN-US">ADO.NET</span><span style="FONT-FAMILY: 宋体">确立了牢固的地位<span style="LETTER-SPACING: -1pt">——</span></span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">实际上，现在在对象之间远程传递数据的格式是</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">。有了</span><span lang="EN-US">.NET</span><span style="FONT-FAMILY: 宋体">运行库，就可以在</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">模式定义文件</span><span lang="EN-US">(XSD)</span><span style="FONT-FAMILY: 宋体">中描述</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">了。而且，可以定义整个</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">，其中有许多</span><span lang="EN-US">DataTables</span><span style="FONT-FAMILY: 宋体">，这些表之间有一定的关系，并包括描述数据的其他信息。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在定义</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件时，运行库中有一个新工具，该工具可以把这个模式转换为对应的数据访问类，例如类型安全的产品</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">类，如上所述。本节开始介绍一个简单的</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件，该文件描述与前面产品示例相同的信息，再扩展它使其包括一些额外的功能。</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"><?xml version="1.0" encoding="utf-8" ?></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"><xs:schema </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> id="Products" </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> targetNamespace="http://tempuri.org/XMLSchema1.xsd" </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> xmlns:mstns="http://tempuri.org/XMLSchema1.xsd" </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> xmlns:xsd="http://www.w3.org/2001/XMLSchema" </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="Product"></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:complexType></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:sequence></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="ProductID" msdata:ReadOnly="true"</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 69.7pt"><span lang="EN-US">msdata:AutoIncrement="true" type="xs:int" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="ProductName" type="xs:string" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="SupplierID" type="xs:int" minOccurs="0" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="CategoryID" type="xs:int" minOccurs="0" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="QuantityPerUnit" type="xs:string" minOccurs="0" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="UnitPrice" type="xs:decimal" minOccurs="0" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="UnitsInStock" type="xs:short" minOccurs="0" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="UnitsOnOrder" type="xs:short" minOccurs="0" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="ReorderLevel" type="xs:short" minOccurs="0" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> <xs:element FTEL="Discontinued" type="xs:boolean" /></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </xs:sequence></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </xs:complexType></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> </xs:element></span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"></xs:schema></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">第</span><span lang="EN-US">24</span><span style="FONT-FAMILY: 宋体">章将详细论述其中的一些选项。现在应知道，这个文件定义一个带有</span><span lang="EN-US">id</span><span style="FONT-FAMILY: 宋体">属性的模式，其中把</span><span lang="EN-US">id</span><span style="FONT-FAMILY: 宋体">属性设置为</span><span lang="EN-US">Products</span><span style="FONT-FAMILY: 宋体">。还定义了一个比较复杂的类</span><span lang="EN-US">Product</span><span style="FONT-FAMILY: 宋体">，其中包含了许多元素，每个元素对应于</span><span lang="EN-US">Products</span><span style="FONT-FAMILY: 宋体">表中的一个字段。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">这些元素映射到数据类上。其中</span><span lang="EN-US">Products</span><span style="FONT-FAMILY: 宋体">模式映射到派生于</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">的一个类上，类</span><span lang="EN-US">Product</span><span style="FONT-FAMILY: 宋体">映射到派生于</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">的一个类上。每个子元素映射到派生于</span><span lang="EN-US">DataColumn</span><span style="FONT-FAMILY: 宋体">的一个类上。所有列的集合都映射到派生于</span><span lang="EN-US">DataRow</span><span style="FONT-FAMILY: 宋体">的一个类上。</span></p>
<p class="MsoNormal"><span lang="EN-US">.NET Framework</span><span style="FONT-FAMILY: 宋体">中有一个工具，只要输入</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件，该工具就可以生成这些类的代码。因为该工具惟一的工作是执行</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件上的各种功能，所以它称为</span><span lang="EN-US">XSD.EXE</span><span style="FONT-FAMILY: 宋体">。</span></p>
<h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><a ftel="_Toc507815169"><span style="FONT-FAMILY: 黑体">用</span><span lang="EN-US">XSD</span></a><span style="FONT-FAMILY: 黑体">生成代码</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">假定把上面的文件保存为</span><span lang="EN-US">Product.xsd</span><span style="FONT-FAMILY: 宋体">，在命令提示符上输入下述命令，把该文件转换为</span><span lang="EN-US"> </span><span style="FONT-FAMILY: 宋体">代码：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><strong><span lang="EN-US">xsd Product.xsd /d</span></strong></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">这会创建文件</span><span lang="EN-US">Product.cs</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">该命令有许多选项可以和</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">一起使用，以改变生成的输出结果，其中一些比较常用的选项如表</span><span lang="EN-US">21-8</span><span style="FONT-FAMILY: 宋体">所示。</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?