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        22.3.4  更新数据源
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                        C#高级编程（第3版）
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                        22.3.4  更新数据源
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                    2006-10-13 14:41:00
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                        <h1 id="divCurrentNode" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165631.htm'><font color='red'>22.3.4  更新数据源</font></a></h1>
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                        <div style='float:left;width:49%'>·<a href='100165628.htm'>22.3.1  创建一个连接</a></div><div style='float:right;width:49%'>·<a href='100165629.htm'>22.3.2  选择数据</a></div><div style='float:left;width:49%'>·<a href='100165630.htm'>22.3.3  生成DataSet</a></div><div style='float:right;width:49%'>·<a href='100165632.htm'>22.3.5  构建模式</a></div><div style='float:left;width:49%'>·<a href='100165633.htm'>22.3.6  其他常见的要求</a></div><div style='float:right;width:49%'>·<a href='100165634.htm'>22.4  小结</a></div></div>
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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"><span lang="EN-US">22.3.4&nbsp; </span><span style="FONT-FAMILY: 黑体">更新数据源</span></h3>
<p class="MsoNormal"><a ftel="sources2"><span style="FONT-FAMILY: 宋体">应用程序已经从数据库中选择了数据，本节将说明把数据的改变返回至数据库。如果您按照上一节的步骤进行，就应得到一个包含连接、</span><span lang="EN-US">DataAdapter</span></a><span style="FONT-FAMILY: 宋体">和</span><span class="codeintext-PRODUCTION"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">DataSet</span></span><span class="codeintext-PRODUCTION"><span style="FONT-FAMILY: 宋体">对象的应用程序。剩下的就只是把</span></span><span class="codeintext-PRODUCTION"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">DataSet</span></span><span class="codeintext-PRODUCTION"><span style="FONT-FAMILY: 宋体">和</span></span><span class="codeintext-PRODUCTION"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">DataGrid</span></span><span class="codeintext-PRODUCTION"><span style="FONT-FAMILY: 宋体">联系起来，添加一些逻辑，以从数据库中检索数据并显示它们，然后把数据的改变返回至数据库。</span></span></p>
<p class="MsoNormal"><span class="codeintext-PRODUCTION"><span style="FONT-FAMILY: 宋体">图</span></span><span class="codeintext-PRODUCTION"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">22-23</span></span><span class="codeintext-PRODUCTION"><span style="FONT-FAMILY: 宋体">显示了这个示例的窗体，它基于</span></span><span class="codeintext-PRODUCTION"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">UpdatingData</span></span><span class="codeintext-PRODUCTION"><span style="FONT-FAMILY: 宋体">示例代码。</span></span></p>
<p align="center"><span lang="EN-US"><img height="173" src="22/image023.jpg" width="298" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span class="codeintext-PRODUCTION"><span style="FONT-FAMILY: 宋体">图</span></span><span class="codeintext-PRODUCTION"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">&nbsp; 22-23</span></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">该窗体包含一个</span><span class="codeintext-PRODUCTION"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">DataGrid</span></span><span class="codeintext-PRODUCTION"><span style="FONT-FAMILY: 宋体">控件和两个按钮。当用户单击</span></span><span class="screentext-PRODUCTION"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'; LETTER-SPACING: 0pt">Retrieve</span></span><span class="screentext-PRODUCTION"><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0pt">按钮时，就执行下述代码：</span></span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">private void retrieveButton_Click(object sender, System.EventArgs e)</span></p>

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