HOW TO：在 .NET Compact Framework 中使用 MSMQ

發行項
08/21/2008

更新：2007 年 11 月

建立使用訊息佇列 (MSMQ) 的 .NET Compact Framework 應用程式，與 .NET Framework 中所使用的處理序非常相似。不過，Windows CE 並不支援 .NET Compact Framework 中的 MSMQ 中所描述的所有功能。

下列程式碼範例會示範如何在相同的裝置上建立訊息佇列、傳送訊息給佇列，以及從佇列接收訊息。在此不需要網路連接。一個簡單類別 (Order) 會用來建立訊息佇列的物件。

這些範例會假設裝置上已經安裝訊息佇列。如需取得訊息佇列元件的詳細資訊，請參閱 .NET Compact Framework 中的 MSMQ。

若要定義 Order 類別

將下列類別加入專案。

' This class represents an object that
' is sent to and received from the queue.
Public Class Order
    Dim ID As Integer
    Dim DTime As DateTime
    Public Property orderID() As Integer
        Get
            Return Me.ID
        End Get
        Set(ByVal value As Integer)
            Me.ID = value
        End Set
    End Property
    Public Property orderTime() As DateTime
        Get
            Return Me.DTime
        End Get
        Set(ByVal value As DateTime)
            Me.DTime = value
        End Set
    End Property
End Class

若要建立訊息佇列

將下列方法加入至表單。

Private Sub CreateQueue()
    ' Determine whether the queue exists.
    If Not MessageQueue.Exists(QPath) Then
        Try
            ' Create the queue if it does not exist.
            myQ = MessageQueue.Create(QPath)
            MessageBox.Show("Queue Created")
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
    Else
        MessageBox.Show("Queue Exists")
    End If
End Sub

若要將訊息傳送至佇列

將下列方法加入至表單。

Private Sub SendMessageToQueue()
    ' Create a new order and set values.
    Dim sendOrder As New Order()
    sendOrder.orderID = 23123
    sendOrder.orderTime = DateTime.Now
    Try
        myQ.Send(sendOrder)
        MessageBox.Show("Message Sent")
    Catch ex As Exception
        MessageBox.Show(ex.Message)
    End Try
End Sub

若要從佇列接收訊息

將下列方法加入至表單。

Private Sub ReceiveMessageFromQueue()
    ' Connect to the a queue on the device.
    myQ = New MessageQueue(QPath)

    ' Set the formatter to indicate the body contains an Order.
    Dim targetTypes() As Type
    targetTypes = New Type() {GetType(Order)}
    myQ.Formatter = New XmlMessageFormatter(targetTypes)
    Try
        ' Receive and format the message. 
        Dim myMessage As Message = myQ.Receive()
        Dim myOrder As Order = CType(myMessage.Body, Order)

        ' Display message information.
        MessageBox.Show("Order ID: " & _
            myOrder.orderID.ToString() & _
                Chr(10) & "Sent: " & myOrder.orderTime.ToString())

    Catch m As MessageQueueException
        ' Handle Message Queuing exceptions.
        MessageBox.Show(m.Message)
    Catch e As InvalidOperationException
        ' Handle invalid serialization format.
        MessageBox.Show(e.Message)
    End Try
End Sub