NETCF开发之MessageQueue控件

1.1 MessageQueue控件

MessageQueue控件是.NET Compact Framework 2.0提供的新控件之一。在Windows CE操作系统中没有内置“消息队列”(也称为MSMQ)。但是.NET Compact Framework 2.0Windows CE提供了对 “消息队列”的支持。MessageQueue控件是对“消息队列”的包装,提供对“消息队列”队列的引用。MSMQ使应用程序可以跨网络与Pocket PC或桌面应用程序进行同步或异步通信。MessageQueue控件没有设计时界面。

应用程序使用MessageQueue控件将消息发送到MSMQMSMQ可以在设备间发送和接收应用程序消息。当网络连接建立时,MSMQ将消息传送到远程队列,而无需考虑接收消息的应用程序是否正在运行。接收应用程序可以在任何时候从其本地队列中检查消息。

4-8列出了MessageQueue控件的主要属性。

4-8MessageQueue的主要属性

属性

说明

CanRead

获取一个值,该值指示 MessageQueue 是否可读。

CanWrite

获取一个值,该值指示 MessageQueue 是否可写。

Category

获取或设置队列类别。

FormatName

获取“消息队列”在创建队列时生成的唯一队列名。

Formatter

获取或设置格式化程序,该格式化程序用于将对象序列化为从队列读取或写入队列的消息体,或者用于将从队列读取或写入队列的消息体反序列化为对象。

Id

获取队列的唯一“消息队列”标识符。

Label

获取或设置队列说明。

MachineName

获取或设置“消息队列”队列所在的计算机的名称。

MaximumQueueSize

获取或设置队列的最大容量。

Path

获取或设置队列的路径。设置Path会导致MessageQueue指向新队列。

QueueName

获取或设置标识队列的友好名称。

可以采用有三种名称对MessageQueue控件的Path属性进行设置:友好名称、FormatNameLabel。友好名称由MachineNameQueueName属性定义,公共队列采用MachineName\QueueName形式表示,专用队列采用MachineName\Private$\QueueName形式表示。FormatName属性允许对消息队列进行脱机访问。除此,还可使用队列的 Label 属性设置队列的Path属性。.NET Compact Framework 2.0只支持XmlMessageFormatter,以将消息序列化至消息队列,并从消息队列反序列化消息。

4-3列出了MessageQueue控件的主要方法。

4-3MessageQueue的主要方法

方法

说明

BeginPeek

通过通知“消息队列”开始查看消息并在完成后通知事件处理程序,启动一个异步查看操作。

BeginReceive

通过通知“消息队列”开始接收消息并在完成后通知事件处理程序,启动一个异步接收操作。

Create

在“消息队列”服务器上的指定路径中创建新队列。

Delete

删除“消息队列”服务器上的队列。

EndPeek

完成指定的异步查看操作。

EndReceive

完成指定的异步接收操作。

Equals

确定两个Object实例是否相等。

Exists

确定指定的路径中是否存在“消息队列”队列。

GetAllMessages

返回位于队列中的所有消息。

GetPrivateQueuesByMachine

检索指定计算机上的所有专用队列。

GetType

获取当前实例的Type

Peek

返回队列中第一条消息的副本,而不从队列中移除该消息。

Purge

删除队列中包含的所有消息。

可以在MessageQueue的构造函数中指定一个连接到现有队列资源的路径,或者在创建新队列。在调用Send(Object)PeekReceive之前,必须将MessageQueue控件与某个现有队列关联。此时,可操作该队列的属性,如CategoryLabel

MessageQueue控件支持两种方式的消息检索:同步和异步。同步方式采用PeekReceive方法使线程用指定的间隔时间等待新消息到达队列。异步方式的BeginPeekBeginReceive方法允许Pocket PC应用程序在消息到达队列之前,在单独的线程中继续执行。 当创建MessageQueue控件的新实例时,并不是要创建新的“消息队列”队列,而是使用 Create(String)DeletePurge方法管理服务器上的队列。

Purge方法不同,Create(String)Deletestatic成员,因此可以调用它们而无需创建 MessageQueue 类的实例。

1.1.1 创建消息队列

清单4-11演示在本地设备上创建一个名为myQueue的消息队列。

清单 4-11 创建消息队列

<textbox style="mso-next-textbox: #_x0000_s1037"><font size="3"></font></textbox>

……

If Not System.Messaging.MessageQueue.Exists(".\myQueue") Then

Try

' 创建新的队列

Dim myQueue As New System.Messaging.MessageQueue(".\myQueue")

MsgBox("队列创建成功")

Catch ex As Exception

MsgBox(ex.Message)

End Try

Else

MsgBox("队列已存在")

End If

……

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1.1.2 向队列发送消息

清单4-13演示向本地设备上的myQueue队列发送消息。消息内容可以根据实际需要进行自定义,这里自定义一个可序列化的order类,消息每次向队列发送一个order类实例。清单4-12演示order类的定义。

清单 4-12 order类定义

<group id="_x0000_s1026" style="WIDTH: 414pt; HEIGHT: 319.8pt; mso-position-horizontal-relative: char; mso-position-vertical-relative: line" editas="canvas" coordorigin="2526,7642" coordsize="7200,5575"><lock v:ext="edit" aspectratio="t"></lock><shape id="_x0000_s1027" style="LEFT: 2526px; WIDTH: 7200px; POSITION: absolute; TOP: 7642px; HEIGHT: 5575px" 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_s1028" style="LEFT: 2526px; WIDTH: 7200px; POSITION: absolute; TOP: 7642px; HEIGHT: 5575px" 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 lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">Public Class Order<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 ID As Integer<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 DTime As DateTime<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>Public Property orderID() As Integer<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>Get<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>Return Me.ID<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>End Get<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>Set(ByVal value As Integer)<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>Me.ID = value<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><span style="mso-spacerun: yes"></span>End Set<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>End Property<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>Public Property orderTime() As DateTime<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>Get<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>Return Me.DTime<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>End Get<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>Set(ByVal value As DateTime)<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>Me.DTime = value<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>End Set<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>End Property<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">End Class<p></p></font></span></p> </div> </td> </tr></tbody></table></textbox></rect><wrap type="none"></wrap><anchorlock></anchorlock></group>

清单 4-13 向队列发送消息

<group id="_x0000_s1032" style="WIDTH: 414pt; HEIGHT: 241.8pt; mso-position-horizontal-relative: char; mso-position-vertical-relative: line" editas="canvas" coordorigin="2526,7642" coordsize="7200,4215"><lock v:ext="edit" aspectratio="t"></lock><shape id="_x0000_s1033" style="LEFT: 2526px; WIDTH: 7200px; POSITION: absolute; TOP: 7642px; HEIGHT: 4215px" 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_s1034" style="LEFT: 2526px; WIDTH: 7200px; POSITION: absolute; TOP: 7642px; HEIGHT: 4215px" 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">' </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'">创建消息内容</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 sendOrder As New Order()<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">Dim myQueue As New System.Messaging.MessageQueue(".\myQueue")<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">sendOrder.orderID = 23123<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">sendOrder.orderTime = DateTime.Now<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">Try<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-tab-count: 1"> </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'">发送消息</span><span lang="EN-US" style="FONT-SIZE: 9pt"><p></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">myQueue.Send(sendOrder)<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">MsgBox("</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'">消息发送成功</span><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">")<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">Catch ex As Exception<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">MsgBox(ex.Message)<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">End Try<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>

1.1.3 从队列接收消息

清单4-14演示从本地设备上的myQueue队列接收消息。

清单 4-14 从队列接收消息

<group id="_x0000_s1029" style="WIDTH: 414pt; HEIGHT: 397.8pt; mso-position-horizontal-relative: char; mso-position-vertical-relative: line" editas="canvas" coordorigin="2526,7642" coordsize="7200,6933"><lock v:ext="edit" aspectratio="t"></lock><shape id="_x0000_s1030" style="LEFT: 2526px; WIDTH: 7200px; POSITION: absolute; TOP: 7642px; HEIGHT: 6933px" 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: 6933px" 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">' </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'">与队列建立连接</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 myQueue As New System.Messaging.MessageQueue(".\myQueue")<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">' </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'">设置消息体格式</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 targetTypes() As Type<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">targetTypes = New Type() {GetType(Order)}<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">myQueue.Formatter = New System.Messaging.XmlMessageFormatter(targetTypes)<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">Try<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">' </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'">接收并格式化消息</span><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"> <p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">Dim myMessage As System.Messaging.Message = myQueue.Receive()<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">Dim myOrder As Order = CType(myMessage.Body, Order)<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; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">' </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'">显示消息内容</span><span lang="EN-US" style="FONT-SIZE: 9pt"><p></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">MsgBox("Order ID: " &amp; _<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">myOrder.orderID.ToString() &amp; _<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">Chr(10) &amp; "Sent: " &amp; myOrder.orderTime.ToString())<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">Catch m As System.Messaging.MessageQueueException<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">' </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'">处理消息队列抛出的例外</span><span lang="EN-US" style="FONT-SIZE: 9pt"><p></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">MsgBox(m.Message)<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">Catch ex As InvalidOperationException<p></p></font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">' </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'">处理无效序列化格式</span><span lang="EN-US" style="FONT-SIZE: 9pt"><p></p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">MsgBox(ex.Message)<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">End Try<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> </div> </td> </tr></tbody></table></textbox></rect><wrap type="none"></wrap><anchorlock></anchorlock></group>

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