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22.3.3 生成DataSet
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22.3.3 生成DataSet
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<link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><a ftel="_Toc507815189"><span lang="EN-US">22.3.3 </span></a><span style="FONT-FAMILY: 黑体">生成</span><span lang="EN-US">DataSet</span></h3>
<p class="MsoNormal"><a ftel="datasets2"><span style="FONT-FAMILY: 宋体">定义了</span><span lang="EN-US">DataAdapter</span></a><span style="FONT-FAMILY: 宋体">后，就可以使用它创建一个</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">。要生成</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">，可单击</span><span lang="EN-US">DataAdapter</span><span style="FONT-FAMILY: 宋体">，显示该对象的属性</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">按下</span><span lang="EN-US">F4)</span><span style="FONT-FAMILY: 宋体">。在属性表单的底部有</span><span lang="EN-US">3</span><span style="FONT-FAMILY: 宋体">个选项</span><span lang="EN-US">Configure Data Adapter</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Generate Dataset</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">Preview Data</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span style="FONT-FAMILY: 宋体">单击</span><span lang="EN-US">Generate DataSet</span><span style="FONT-FAMILY: 宋体">，可以为新</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">对象选择一个名称，再选择要添加到该</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">中的表<span style="LETTER-SPACING: -1pt">——</span></span><span style="LETTER-SPACING: -1pt"> </span><span style="FONT-FAMILY: 宋体">如果把多个表从</span><span lang="EN-US">Server Explorer</span><span style="FONT-FAMILY: 宋体">拖放到窗体上，就可以在对话框中把它们链接到一个</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">中。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span style="FONT-FAMILY: 宋体">实际上创建的是一个</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">模式，它定义了</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">以及包含在该</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">中的每个表。这类似于第</span><span lang="EN-US">21</span><span style="FONT-FAMILY: 宋体">章中手工编写的示例，但本例是自动创建</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span style="FONT-FAMILY: 宋体">除了</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件外，还有一个</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">隐藏的</span><span lang="EN-US">).cs</span><span style="FONT-FAMILY: 宋体">文件定义了许多类型安全的类。要查看这个文件，可单击</span><span lang="EN-US">Show All Files</span><span style="FONT-FAMILY: 宋体">工具栏按钮，再扩展</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件，如图</span><span lang="EN-US">22-22</span><span style="FONT-FAMILY: 宋体">所示。</span></p>
<p align="center"><span lang="EN-US"><img height="157" src="22/image022.jpg" width="141" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 22-22</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span lang="EN-US">Visual Studio .NET</span><span style="FONT-FAMILY: 宋体">创建了与</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件同名的一个</span><span lang="EN-US">.cs</span><span style="FONT-FAMILY: 宋体">文件。定义的类如下所示：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">派生于</span><span lang="EN-US">DataSet</span><span style="FONT-FAMILY: 宋体">的类。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">为所选的</span><span lang="EN-US">DataAdapter</span><span style="FONT-FAMILY: 宋体">创建的派生于</span><span lang="EN-US">DataTable </span><span style="FONT-FAMILY: 宋体">的类。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">派生于</span><span lang="EN-US">DataRow </span><span style="FONT-FAMILY: 宋体">的类，它定义了在</span><span lang="EN-US">DataTable </span><span style="FONT-FAMILY: 宋体">中可以访问的列。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="FONT-FAMILY: 宋体">派生于</span><span lang="EN-US">EventArgs </span><span style="FONT-FAMILY: 宋体">的类，在行发生变化时使用。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span style="FONT-FAMILY: 宋体">生成该文件和这些类的工具是第</span><span lang="EN-US">21</span><span style="FONT-FAMILY: 宋体">章介绍过的</span><span lang="EN-US">XSD.EXE</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在向导完成了任务后，还可以选择更新</span><span lang="EN-US">XSD</span><span style="FONT-FAMILY: 宋体">文件，但不要编辑</span><span lang="EN-US">.cs</span><span style="FONT-FAMILY: 宋体">文件，因为在重新编译项目时，该文件会重新生成，所有的改变都会丢失。</span></p></div>
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