NETCF开发之Notification控件

1.1 Notification控件

Notification控件是.NET Compact Framework 2.0提供的新控件之一。Notification实现用于显示和响应用户通知的功能。如图4-13所示，使用Notification控件询问用户是否开始下载。

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图4-13：Notification控件

表4-2列出了Notification控件的主要属性。

表4-2：Notification的主要属性

属性	说明
Caption	获取或设置指定消息气球的标题文本的字符串。
Critical	获取或设置一个值，指示通知是否非常重要。
Icon	获取或设置标题栏上的消息气球的当前图标。
InitialDuration	获取或设置消息气球首次显示之后保持可见的秒数。
Text	获取或设置消息气球的文本。
Visible	获取或设置一个值，用以指示消息气球是否可见。

创建通知后，可设置Visible属性控制是否显示通知。InitialDuration属性设置消息气球最初显示的时间。如果将InitialDuration设置为零，并将Visible设置为 true，则消息气球不会显示，但是标题栏中会有它的图标，单击可以重新激活它。通知除了能够显示纯文本之外，还可以在消息气球中创建HTML内容的用户通知。清单4-3演示创建并显示如图4-13所示的HTML内容的通知。

清单 4-3 创建并显示HTML内容的通知

<group id="_x0000_s1029" style="WIDTH: 414pt; HEIGHT: 553.85pt; mso-position-horizontal-relative: char; mso-position-vertical-relative: line" editas="canvas" coordorigin="2526,7642" coordsize="7200,9652"><lock v:ext="edit" aspectratio="t"></lock><shape id="_x0000_s1030" style="LEFT: 2526px; WIDTH: 7200px; POSITION: absolute; TOP: 7642px; HEIGHT: 9652px" o:preferrelative="f" type="#_x0000_t75"><font size="3"><fill o:detectmouseclick="t"></fill><path o:extrusionok="t" o:connecttype="none"></path><lock v:ext="edit" text="t"></lock></font></shape><rect id="_x0000_s1031" style="LEFT: 2526px; WIDTH: 7200px; POSITION: absolute; TOP: 7642px; HEIGHT: 9652px" fillcolor="#eaeaea" strokecolor="#eaeaea"><textbox><table cellspacing="0" cellpadding="0" width="100%"><tbody><tr> <td style="BORDER-LEFT-COLOR: #d4d0c8; BORDER-BOTTOM-COLOR: #d4d0c8; BORDER-TOP-COLOR: #d4d0c8; BACKGROUND-COLOR: transparent; BORDER-RIGHT-COLOR: #d4d0c8"> <div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">……</span><span lang="EN-US" style="FONT-SIZE: 9pt"><p></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">Dim HTMLString As New Text.StringBuilder<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>Dim sPath As String<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><p><font face="Times New Roman"></font></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>sPath = System.IO.Path.GetDirectoryName(_<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 42pt; TEXT-INDENT: 25.45pt; mso-char-indent-count: 2.83; mso-para-margin-left: 4.0gd"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase.ToString())<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><p><font face="Times New Roman"></font></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;html&gt;&lt;body&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;font color=""#0000FF""&gt;Data ready to download&lt;/font&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&amp;nbsp;&amp;nbsp;&lt;a href=""settings""&gt;Settings&lt;/a&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;br&gt;&lt;form method=""GET"" action=notify&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;SELECT NAME=""lstbx""&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("_<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 42pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">&lt;OPTION VALUE=""0""&gt;Start now&lt;/OPTION&gt;&lt;OPTION VALUE=""1""&gt;In 1 hr&lt;/OPTION&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("_<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">&lt;OPTION VALUE=""2""&gt;In 2 hrs&lt;/OPTION&gt;&lt;OPTION VALUE=""3""&gt;In 3 hrs&lt;/OPTION&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;OPTION VALUE=""4""&gt;In 4 hrs&lt;/OPTION&gt;&lt;/SELECT&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;input type=checkbox name=chkbx&gt;Notify completion")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;br&gt;&lt;input type='submit'&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;input type=button name='cmd:2' value='Cancel'&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>HTMLString.Append("&lt;/body&gt;&lt;/html&gt;")<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><p><font face="Times New Roman"></font></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>' </font></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设置</span><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">Text</font></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">属性</span><span lang="EN-US" style="FONT-SIZE: 9pt"><p></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>Notification1.Text = HTMLString.ToString()<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><p><font face="Times New Roman"></font></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>Dim IconStream As New IO.FileStream(sPath + "\info.ico", _<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 42pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">IO.FileMode.Open, IO.FileAccess.Read)<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>Notification1.Icon = New Drawing.Icon(IconStream, 16, 16)<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>Notification1.Caption = "Notification Demo"<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>Notification1.Critical = False<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><p><font face="Times New Roman"></font></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>' </font></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设置气球显示时间</span><span lang="EN-US" style="FONT-SIZE: 9pt"><p></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>Notification1.InitialDuration = 10<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>Notification1.Visible = True<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">……</span><span lang="EN-US" style="FONT-SIZE: 9pt"><p></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><p><font face="Times New Roman"></font></p></span></p> </div> </td> </tr></tbody></table></textbox></rect><wrap type="none"></wrap><anchorlock></anchorlock></group>

表4-3列出了Notification控件的主要事件。

表4-3：Notification的主要事件

事件	说明
BalloonChanged	在显示或隐藏消息气球时发生。
ResponseSubmitted	在用户单击消息气球中的按钮或链接时发生。

每当显示或隐藏气球时，无论是使用Visible属性以编程方式进行此操作，还是通过用户交互方式进行此操作，都会触发BalloonChanged事件。通过编写处理ResponseSubmitted事件的代码，可以处理对通知的响应。清单4-4演示处理对通知的响应。

清单 4-4 处理对通知的响应

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