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22.1.3 DataGrid类的层次结构
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C#高级编程（第3版）
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22.1.3 DataGrid类的层次结构
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<div style='float:left;width:49%'>·<a href='100165620.htm'>22.1 DataGrid控件</a></div><div style='float:right;width:49%'>·<a href='100165621.htm'>22.1.1 显示列表数据</a></div><div style='float:left;width:49%'>·<a href='100165622.htm'>22.1.2 数据源</a></div><div style='float:right;width:49%'>·<a href='100165624.htm'>22.2 数据绑定</a></div><div style='float:left;width:49%'>·<a href='100165625.htm'>22.2.1 简单的绑定</a></div><div style='float:right;width:49%'>·<a href='100165626.htm'>22.2.2 数据绑定对象</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"><a ftel="_Toc507815182"><span lang="EN-US">22.1.3 DataGrid</span></a><span style="FONT-FAMILY: 黑体">类的层次结构</span></h3>
<p class="MsoNormal"><a ftel="DataGridhierarchy"><span lang="EN-US">DataGrid</span></a><span style="FONT-FAMILY: 宋体">主要部分的类层次结构如图</span><span lang="EN-US">22-10</span><span style="FONT-FAMILY: 宋体">所示。</span></p>
<p align="center"><span lang="EN-US"><img height="230" src="22/image010.gif" width="349" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 22-10</span></p>
<p class="MsoNormal"><span lang="EN-US">DataGrid</span><span style="FONT-FAMILY: 宋体">由</span><span lang="EN-US">0</span><span style="FONT-FAMILY: 宋体">个或多个</span><span lang="EN-US">DataGridTableStyles</span><span style="FONT-FAMILY: 宋体">组成。样式风格包含</span><span lang="EN-US">0</span><span style="FONT-FAMILY: 宋体">个或多个</span><span lang="EN-US">DataGrid Column Styles</span><span style="FONT-FAMILY: 宋体">。网格中给定的单元格可以通过</span><span lang="EN-US">DataGridCell</span><span style="FONT-FAMILY: 宋体">结构来访问。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">但除了让运行程序创建</span><span lang="EN-US">DataGridTables </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> DataGridColumns</span><span style="FONT-FAMILY: 宋体">外，</span><span lang="EN-US">DataGridTableStyles </span><span style="FONT-FAMILY: 宋体">和</span> <span lang="EN-US" style="LETTER-SPACING: 0.1pt">DataGridColumnStyles</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.1pt">还有更多的内涵。下面的几节就详细介绍这两个类和上图中列出的其</span><span style="LETTER-SPACING: 0.1pt"> </span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.1pt">他</span><span style="FONT-FAMILY: 宋体">类。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面介绍</span><span lang="EN-US">DataGridTableStyle</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> DataGridColumnStyle</span><span style="FONT-FAMILY: 宋体">的内容。</span></p>
<p class="MsoNormal"><a ftel="DataGridTableStyle"><span lang="EN-US">DataGridTableStyle</span></a><span style="FONT-FAMILY: 宋体">包含</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">的可视化表示。</span><span lang="EN-US">DataGrid</span><span style="FONT-FAMILY: 宋体">包含这些样式的一个集合，它们可通过</span><span lang="EN-US">TableStyles</span><span style="FONT-FAMILY: 宋体">属性来访问。在显示</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">时，要对所有的</span><span lang="EN-US">DataGridTableStyle</span><span style="FONT-FAMILY: 宋体">对象进行检查，以查找</span><span lang="EN-US">MappingName</span><span style="FONT-FAMILY: 宋体">等于</span><span lang="EN-US"> DataTable</span><span style="FONT-FAMILY: 宋体">的</span><span lang="EN-US">TableName</span><span style="FONT-FAMILY: 宋体">属性的样式匹配，找到这样的一个匹配后，就使用它显示数据表。</span></p>
<p class="MsoNormal"><span lang="EN-US">DataGridTableStyle</span><span style="FONT-FAMILY: 宋体">允许为</span><span lang="EN-US">DataGrid</span><span style="FONT-FAMILY: 宋体">定义各种可视化参数，例如背景色和前景色，列标题的字体以及其他属性。</span><span lang="EN-US">DataGridColumnStyle</span><span style="FONT-FAMILY: 宋体">可以一列一列地细调显示选项，例如设置列中数据的对齐方式，</span><span lang="EN-US">NULL</span><span style="FONT-FAMILY: 宋体">值的显示文本，列在屏幕上的宽度等。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在</span><span lang="EN-US">DataGrid</span><span style="FONT-FAMILY: 宋体">使用一个已定义好的</span><span lang="EN-US">DataGridTableStyle</span><span style="FONT-FAMILY: 宋体">来显示</span><span lang="EN-US">DataTable</span><span style="FONT-FAMILY: 宋体">时，只会显示那些已构建了</span><span lang="EN-US">DataGridColumnStyle</span><span style="FONT-FAMILY: 宋体">的列。只有定义了风格的列才能显示，这非常适合于隐藏某些列，例如主键码值一般不显示，也可以把列的样式定义为</span><span lang="EN-US">ReadOnly</span><span style="FONT-FAMILY: 宋体">。列的隐藏不像过滤列和过滤行的方法那样简单，但也不是很难。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面的代码显示了创建</span><span lang="EN-US">DataGridTableStyle</span><span style="FONT-FAMILY: 宋体">的示例，这个示例创建了一个</span><span lang="EN-US">DataGridTableStyle</span><span style="FONT-FAMILY: 宋体">对象，添加两个</span><span lang="EN-US">DataColumnStyle</span><span style="FONT-FAMILY: 宋体">对象，然后显示</span><span lang="EN-US">Customers</span><span style="FONT-FAMILY: 宋体">表中的所有数据，下面列出了所有的代码，因为它是本章其他几个示例的基础。代码的第一部分与前面示例的类似：</span></p>
<p class="a6" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">using System;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">using System.Windows.Forms;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">using System.Data;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">using System.Data.SqlClient;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">public class CustomDataGridTableStyle : System.Windows.Forms.Form</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">{</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> private System.Windows.Forms.Button retrieveButton;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> private System.Windows.Forms.DataGrid dataGrid;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> public CustomDataGridTableStyle()</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> {</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> this.ClientSize = new System.Drawing.Size(464, 253);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> this.Text = "07_CustomDataGridTableStyle";</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> this.dataGrid = new System.Windows.Forms.DataGrid();</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> dataGrid.BeginInit();</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> dataGrid.Location = new System.Drawing.Point(8, 8);</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> dataGrid.Size = new System.Drawing.Size(448, 208);</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> dataGrid.TabIndex = 0;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> dataGrid.Anchor = AnchorStyles.Bottom | AnchorStyles.Top | </span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> AnchorStyles.Left | AnchorStyles.Right;</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> this.Controls.Add(this.dataGrid);</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> dataGrid.EndInit();</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> this.retrieveButton = new System.Windows.Forms.Button();</span></p>
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