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<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">要设置应显示在按钮上的图标，可以把</span><span lang="EN-US">ImageIndex</span><span style="FONT-FAMILY: 宋体">设置为在</span><span lang="EN-US">ToolBar</span><span style="FONT-FAMILY: 宋体">控件上使用的</span><span lang="EN-US">ImageList</span><span style="FONT-FAMILY: 宋体">的索引。</span><span lang="EN-US">Text</span><span style="FONT-FAMILY: 宋体">属性定义显示在按钮上的文本。如果设置了</span><span lang="EN-US">ToolTip</span><span style="FONT-FAMILY: 宋体">文本，它就在鼠标位于按钮上时显示为工具提示。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">为了在单击</span><span lang="EN-US">ToolBarButton</span><span style="FONT-FAMILY: 宋体">时执行一个任务，您可能会考虑在按钮上使用单击事件。但这里不是这样。</span><span lang="EN-US">ToolBar</span><span style="FONT-FAMILY: 宋体">控件有一个</span><span lang="EN-US">ButtonClick</span><span style="FONT-FAMILY: 宋体">事件，它接收一个</span><span lang="EN-US">ToolBarButtonClickEventArgs</span><span style="FONT-FAMILY: 宋体">对象。这个对象有一个</span><span lang="EN-US">Button</span><span style="FONT-FAMILY: 宋体">属性，它返回被单击的</span><span lang="EN-US">ToolBarButton</span><span style="FONT-FAMILY: 宋体">。在</span><span lang="EN-US">ButtonClick</span><span style="FONT-FAMILY: 宋体">事件中，一般有一个</span><span lang="EN-US">switch</span><span style="FONT-FAMILY: 宋体">语句，负责传送</span><span lang="EN-US">ToolBarButtonClickEventArgs</span><span style="FONT-FAMILY: 宋体">对象的</span><span lang="EN-US">Button</span><span style="FONT-FAMILY: 宋体">属性。根据被单击的按钮，</span><span lang="EN-US">switch</span><span style="FONT-FAMILY: 宋体">语句执行相应的代码。例如，假定有一个</span><span lang="EN-US">ToolBar</span><span style="FONT-FAMILY: 宋体">控件</span><span lang="EN-US">tbMain</span><span style="FONT-FAMILY: 宋体">，它在</span><span lang="EN-US">ToolBarButtonCollection</span><span style="FONT-FAMILY: 宋体">中有</span><span lang="EN-US">3</span><span style="FONT-FAMILY: 宋体">个按钮。我们要使用</span><span lang="EN-US">ToolBarButton</span><span style="FONT-FAMILY: 宋体">的</span><span lang="EN-US">Text</span><span style="FONT-FAMILY: 宋体">属性确定在</span><span lang="EN-US">tbMain_ButtonClick</span><span style="FONT-FAMILY: 宋体">事件中执行什么代码。</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 tbMain_ButtonClick(object sender, </span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">System.Windows.Forms. ToolBarButtonClickEventArgs 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">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp; switch(e.Button.Text)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp; {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; case &quot;Button 1&quot;:</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp; MessageBox.Show(&quot;The Button 1 toolbar button was selected. &quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp; break;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; case &quot;Button 2&quot;:</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp; if (e.Button.Pushed)</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MessageBox.Show(&quot;The Button 2 toolbar button is pushed. &quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp; else</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MessageBox.Show(&quot;The Button 2 toolbar button is not pushed.&quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp; break;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; case &quot;Button 3&quot;:</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; {</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp; MessageBox.Show(&quot;The Button 3 toolbar button was selected. &quot;);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp; break;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;&nbsp;&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp; }</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">&nbsp;</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">在这个简单的示例中，仅给用户显示了一个消息框，说明单击了哪个按钮。对于文本值为</span><span lang="EN-US">Button 2</span><span style="FONT-FAMILY: 宋体">的按钮，还查询了</span><span lang="EN-US">Pushed</span><span style="FONT-FAMILY: 宋体">属性，只有</span><span lang="EN-US">Style</span><span style="FONT-FAMILY: 宋体">属性被设置为</span><span lang="EN-US">ToolBarButtonStyle. ToggleButton</span><span style="FONT-FAMILY: 宋体">时，才与此相关。</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='100165553.htm'><font color='red'>19.3.19  ToolBar控件</font></a></h1>
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                        <div style='float:left;width:49%'>·<a href='100165550.htm'>19.3.16  StatusBar控件</a></div><div style='float:right;width:49%'>·<a href='100165551.htm'>19.3.17  TabControl控件和TabPages控件</a></div><div style='float:left;width:49%'>·<a href='100165552.htm'>19.3.18  Menu控件</a></div><div style='float:right;width:49%'>·<a href='100165554.htm'>19.4  窗体</a></div><div style='float:left;width:49%'>·<a href='100165555.htm'>19.4.1  Form类</a></div><div style='float:right;width:49%'>·<a href='100165556.htm'>19.4.2  多文档界面</a></div></div>
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