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<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;meta
FTEL=&quot;vs_defaultClientScript&quot; content=&quot;JavaScript&quot; &gt;</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;meta
FTEL=&quot;vs_targetSchema&quot;</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
content=&quot;http://schemas.microsoft.com/intellisense/ie5&quot; &gt;</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp; &lt;/HEAD&gt;</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp; &lt;body MS_POSITIONING=&quot;GridLayout&quot;&gt;</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;form id=&quot;Form1&quot;
method=&quot;post&quot; runat=&quot;server&quot;&gt;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&lt;PCS:WebCustomControl1 ID=&quot;testControl&quot; Runat=&quot;server&quot;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Text=&quot;Testing again...&quot;/&gt;</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:13.0pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/form&gt;</span></p>

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lang=EN-US>&nbsp;&nbsp; &lt;/body&gt;</span></p>

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margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&lt;/html&gt;</span></p>

<p class=MsoNormal style='line-height:15.0pt'><span style='font-family:宋体'>实际上，一旦编译了控件库项目，还有另一个更好的方法来完成此操作。</span><span
lang=EN-US>VS.NET</span><span style='font-family:宋体'>工具箱中有一个选项卡</span><span
lang=EN-US>My User Controls</span><span style='font-family:宋体'>，可以用于添加自己的定制控件</span><span
lang=EN-US>(</span><span style='font-family:宋体'>也可以添加自己的选项卡</span><span
lang=EN-US>)</span><span style='font-family:宋体'>。右击要添加新控件的选项卡，选择</span><span
lang=EN-US>Add/Remove Items</span><span style='font-family:宋体'>菜单项，接着从</span><span
lang=EN-US>.NET Framework Component</span><span style='font-family:宋体'>选项卡中浏览到</span><span
lang=EN-US>PCSCustomWebControls.dll</span><span style='font-family:宋体'>程序集。加载了该程序集后，就可以在列表中选择控件了，如图</span><span
lang=EN-US>27-7</span><span style='font-family:宋体'>所示。</span></p>

<p align=center><span lang=EN-US><img width=388 height=272
src="27/image007.jpg"></span></p>

<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US>&nbsp; 27-7</span></p>

<p class=MsoNormal><span style='font-family:宋体'>选择</span><span lang=EN-US>WebCustomControl1</span><span
style='font-family:宋体'>，如上图所示，新控件就显示在工具箱中，以供添加到窗体上，如图</span><span lang=EN-US>27-8</span><span
style='font-family:宋体'>所示。</span></p>

<p align=center><span lang=EN-US><img width=172 height=60
src="27/image008.jpg"></span></p>

<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US>&nbsp; 27-8</span></p>

<p class=MsoNormal><span style='font-family:宋体'>这样做的优点是，如果从工具箱中添加控件，对</span><span
lang=EN-US>PCSCustomWebControls</span><span style='font-family:宋体'>的项目引用和</span><span
lang=EN-US>&lt;%@ Register %&gt;</span><span style='font-family:宋体'>指令会自动添加到控件中。控件库的标记前缀也会自动给出</span><span
lang=EN-US>(</span><span style='font-family:宋体'>在本例中是</span><span lang=EN-US>ccl)</span><span
style='font-family:宋体'>。这很不错，但自己完成这些工作将有更大的灵活性，可以提高代码的可读性。在本章后面的代码中，假定对</span><span
lang=EN-US>PCSCustomWebControls</span><span style='font-family:宋体'>中的控件使用</span><span
lang=EN-US>PCS</span><span style='font-family:宋体'>前缀。</span></p>

<p class=a3 style='margin-top:8.15pt;FTEL:21.45pt'><span
style='font-family:黑体'>注意：</span></p>

<p class=a1 style='FTEL:8.15pt;FTEL:21.85pt'><span
style='font-family:楷体_GB2312;letter-spacing:.1pt'>可以在控件的代码中控制用于</span><span
lang=EN-US style='letter-spacing:.1pt'>ToolBox</span><span style='font-family:
楷体_GB2312;letter-spacing:.1pt'>项目的前缀，其方法是在控件的代码中添加如下属性：</span></p>

<p class=a6 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>[assembly: TagPrefix(&quot;WebCustomControl1&quot;,
&quot;PCS&quot;)]</span></p>

<p class=MsoNormal><span style='font-family:宋体'>然后给</span><span lang=EN-US>WebForm1.aspx.cs</span><span
style='font-family:宋体'>中的命名空间</span><span lang=EN-US>PCSCustomWebControlsTestApp</span><span
style='font-family:宋体'>添加</span><span lang=EN-US>using</span><span
style='font-family:宋体'>语句。为了不让控件使用完全限定的名称，可以自己添加</span><span lang=EN-US>using</span><span
style='font-family:宋体'>语句：</span></p>

<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp; using
PCSCustomWebControls;</span></p>

<p class=MsoNormal><span style='font-family:宋体'>这样，就可以在窗体的后台编码中使用定制控件，且不必写出完全限定的名称。</span></p>

<p class=MsoNormal><span style='font-family:宋体'>现在，只要把</span><span lang=EN-US>PCSCustomWebControls</span><span
style='font-family:宋体'>配置为启动应用程序，就可以单击</span><span lang=EN-US>Debug</span><span
style='font-family:宋体'>按钮，查看结果了。把新增控件的</span><span lang=EN-US>Text</span><span
style='font-family:宋体'>属性改为</span><span lang=EN-US>Testing again</span><span
style='font-family:宋体'>，再运行应用程序，结果如图</span><span lang=EN-US>27-9</span><span
style='font-family:宋体'>所示。</span></p>

<p align=center><span lang=EN-US><img width=299 height=122
src="27/image009.jpg"></span></p>

<p align=center style='FTEL:0cm;FTEL:.0001pt'><span
style='font-family:宋体'>图</span><span lang=EN-US>&nbsp; 27-9</span></p>

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