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<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=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
Microsoft.Win32;</span></p>

<p class=MsoNormal><span style='font-family:宋体'>在主</span><span lang=EN-US>Form1</span><span
style='font-family:宋体'>类中添加一个字段</span><span lang=EN-US>(<span
class=codeintext-PRODUCTION><span style='font-family:"Times New Roman"'>chooseColorDialog</span></span>)</span><span
style='font-family:宋体'>，表示颜色对话框：</span></p>

<p class=a6 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US>&nbsp;&nbsp; public class Form1 : System.Windows.Forms.Form</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;
{</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
private System.Windows.Forms.ListBox listBoxMessages;</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
private System.Windows.Forms.Button buttonChooseColor;</span></p>

<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
private ColorDialog chooseColorDialog = new ColorDialog();</span></p>

<p class=MsoNormal><span style='font-family:宋体'>在</span><span lang=EN-US>Form1</span><span
style='font-family:宋体'>构造函数中执行如下操作：</span></p>

<p class=a6 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public Form1()</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
InitializeComponent();</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
buttonChooseColor.Click += new EventHandler(OnClickChooseColor);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
try</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (ReadSettings() == false)</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
listBoxMessages.Items.Add(&quot;No information in registry&quot;);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
listBoxMessages.Items.Add(&quot;Information read in from registry&quot;);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
StartPosition = FormStartPosition.Manual;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
catch (Exception e)</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;listBoxMessages.Items.Add(&quot;A
problem occurred reading in data </span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
from registry:&quot;);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
listBoxMessages.Items.Add(e.Message);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=a6 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=MsoNormal><span style='font-family:宋体'>在这个构造函数中，首先为用户单击按钮建立事件处理程序。该处理程序是一个方法</span><span
lang=EN-US>OnClickChooseColor(</span><span style='font-family:宋体'>详见后面的内容</span><span
lang=EN-US>)</span><span style='font-family:宋体'>。使用另一个方法</span><span
lang=EN-US>ReadSettings()</span><span style='font-family:宋体'>读取配置信息，如果该方法在注册表中找到信息，就返回</span><span
lang=EN-US>true</span><span style='font-family:宋体'>。否则就返回</span><span
lang=EN-US>false(</span><span style='font-family:宋体'>应返回</span><span
lang=EN-US>false</span><span style='font-family:宋体'>，因为这是第一次运行该程序</span><span
lang=EN-US>)</span><span style='font-family:宋体'>。把这部分构造函数放在</span><span
lang=EN-US>try</span><span style='font-family:宋体'>块中，以防读取注册表值时产生任何异常</span><span
lang=EN-US>(</span><span style='font-family:宋体'>如果用户使用</span><span lang=EN-US>regedit</span><span
style='font-family:宋体'>查看该注册表，就有可能产生异常</span><span lang=EN-US>)</span><span
style='font-family:宋体'>。</span></p>

<p class=MsoNormal><span lang=EN-US>StartPosition = FormStartPosition.Manual;</span><span
style='font-family:宋体'>语句说明窗体位于</span><span lang=EN-US>DeskTopLocation</span><span
style='font-family:宋体'>属性的原始起始位置，而不是使用</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>默认的位置</span><span lang=EN-US>(</span><span
style='font-family:宋体'>默认的操作</span><span lang=EN-US>)</span><span
style='font-family:宋体'>。其值是</span><span lang=EN-US>FormStartPosition</span><span
style='font-family:宋体'>枚举中的值。</span></p>

<p class=MsoNormal><span lang=EN-US>SelfPlacingWindow</span><span
style='font-family:宋体'>也是本书中为</span><span lang=EN-US>Dispose()</span><span
style='font-family:宋体'>方法添加代码的几个程序之一。在应用程序正常中断时，调用</span><span lang=EN-US>Dispose()</span><span
style='font-family:宋体'>方法，把配置信息保存到注册表中的理想位置。保存配置信息使用另一个方法</span><span
lang=EN-US>SaveSettings()</span><span style='font-family:宋体'>来完成：</span></p>

<p class=a6 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; protected override void Dispose( bool
disposing )</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if( disposing )</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (components != null) </span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
components.Dispose();</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
SaveSettings();</span></p>

<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
base.Dispose( disposing );</span></p>

<p class=a6 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>