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19.3.1 Button控件
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19.3.1 Button控件
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165532.htm'>19.2.5 杂项功能</a></div><div style='float:right;width:49%'>·<a href='100165533.htm'>19.2.6 类层次结构</a></div><div style='float:left;width:49%'>·<a href='100165534.htm'>19.3 标准控件和组件</a></div><div style='float:right;width:49%'>·<a href='100165536.htm'>19.3.2 CheckBox控件</a></div><div style='float:left;width:49%'>·<a href='100165537.htm'>19.3.3 ComboBox控件与ListBox控件</a></div><div style='float:right;width:49%'>·<a href='100165538.htm'>19.3.4 DateTimePicker控件</a></div></div>
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<div id="text"> <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">19.3.1 Button</span><span style="FONT-FAMILY: 黑体">控件</span></h3>
<p class="MsoNormal"><span lang="EN-US">Button</span><span style="FONT-FAMILY: 宋体">类表示简单的命令按钮，派生于</span><span lang="EN-US">ButtonBase</span><span style="FONT-FAMILY: 宋体">类。该类最常见的用法是编写处理按钮</span><span lang="EN-US">Click</span><span style="FONT-FAMILY: 宋体">事件的代码。下面的代码执行</span><span lang="EN-US">Click</span><span style="FONT-FAMILY: 宋体">事件的处理程序。在单击按钮时，会弹出一个显示按钮名称的消息框。</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 btnTest_Click(object sender, System.EventArgs e)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> MessageBox.Show(((Button)sender).Name + " was clicked.");</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"><span style="FONT-FAMILY: 宋体">在</span><span lang="EN-US">PerformClick</span><span style="FONT-FAMILY: 宋体">方法中，可以模仿按钮上的</span><span lang="EN-US">Click</span><span style="FONT-FAMILY: 宋体">事件，而无需用户单击按钮。</span><span lang="EN-US">NotifyDefault</span><span style="FONT-FAMILY: 宋体">方法把一个布尔值作为其参数，告诉按钮把它自己绘制为默认按钮。一般情况下，窗体上的默认按钮有略粗的边框。要把按钮标识为默认，可以把窗体上的</span><span lang="EN-US">AcceptButton</span><span style="FONT-FAMILY: 宋体">属性设置为按钮。接着，在用户按下回车键时，就会引发默认按钮的单击事件。图</span><span lang="EN-US">19-3</span><span style="FONT-FAMILY: 宋体">显示了标题为</span><span lang="EN-US">Default</span><span style="FONT-FAMILY: 宋体">的默认按钮</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">注意黑色的边框</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p align="center"><span lang="EN-US"><img height="48" src="19/image003.jpg" width="127" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 19-3</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">按钮可以包含图像和文本。图像通过</span><span lang="EN-US">ImageList</span><span style="FONT-FAMILY: 宋体">对象提供。</span><span lang="EN-US">ImageList</span><span style="FONT-FAMILY: 宋体">对象在本章的后面解释。</span><span lang="EN-US">Text</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">Image</span><span style="FONT-FAMILY: 宋体">都包含</span><span lang="EN-US">Align</span><span style="FONT-FAMILY: 宋体">属性，用以对齐按钮上的文本和图像。</span></p></div>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165535.htm'><font color='red'>19.3.1 Button控件</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165532.htm'>19.2.5 杂项功能</a></div><div style='float:right;width:49%'>·<a href='100165533.htm'>19.2.6 类层次结构</a></div><div style='float:left;width:49%'>·<a href='100165534.htm'>19.3 标准控件和组件</a></div><div style='float:right;width:49%'>·<a href='100165536.htm'>19.3.2 CheckBox控件</a></div><div style='float:left;width:49%'>·<a href='100165537.htm'>19.3.3 ComboBox控件与ListBox控件</a></div><div style='float:right;width:49%'>·<a href='100165538.htm'>19.3.4 DateTimePicker控件</a></div></div>
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