本文整理汇总了VB.NET中System.ServiceModel.Dispatcher.MessageQuery类的典型用法代码示例。如果您正苦于以下问题：VB.NET MessageQuery类的具体用法？VB.NET MessageQuery怎么用？VB.NET MessageQuery使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了MessageQuery类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: Main
' 导入命名空间
Imports System.IO
Imports System.Xml
Imports System.ServiceModel.Dispatcher
Imports System.ServiceModel
Imports System.ServiceModel.Channels
Imports System.Xml.XPath
Namespace MessageQueryExamples
Public Class Program
Public Shared Sub Main(ByVal args As String())
' The XPathMessageQueryCollection inherits from MessageQueryCollection.
Dim queryCollection As XPathMessageQueryCollection = MessageHelper.SetupQueryCollection()
' Create a message and a copy of the message. You must create a buffered copy to access the message body.
Dim mess As Message = MessageHelper.CreateMessage()
Dim mb As MessageBuffer = mess.CreateBufferedCopy(Integer.MaxValue)
' Evaluate every query in the collection.
Dim q As XPathMessageQuery
For Each q In queryCollection
' Evaluate the query. Note the result type is an XPathResult.
Dim qPathResult As XPathResult = q.Evaluate(Of XPathResult)(mb)
' Use the XPathResult to determine the result type.
Console.WriteLine("Result type: {0}", qPathResult.ResultType)
' The following code prints the result according to the result type.
If qPathResult.ResultType = XPathResultType.String Then
Console.WriteLine("{0} = {1}", q.Expression, qPathResult.GetResultAsString())
End If
If (qPathResult.ResultType = XPathResultType.NodeSet) Then
' Iterate through the node set.
Dim ns As XPathNodeIterator = qPathResult.GetResultAsNodeset()
Dim n As XPathNavigator
For Each n In ns
Console.WriteLine(" {0} = {1}", q.Expression, n.Value)
Next
End If
If qPathResult.ResultType = XPathResultType.Number Then
Console.WriteLine(" {0} = {1}", q.Expression, qPathResult.GetResultAsNumber())
End If
If qPathResult.ResultType = XPathResultType.Boolean Then
Console.WriteLine(" {0} ={1}", q.Expression, qPathResult.GetResultAsBoolean())
End If
If qPathResult.ResultType = XPathResultType.Error Then
Console.WriteLine(" Error!")
End If
Next
Console.WriteLine()
' The alternate code below demonstrates similar funcionality using a MessageQueryTable.
' The difference is the KeyValuePair that requires a key to index each value.
' The code uses the expression as the key, and an arbitrary value for the value.
'Dim mq As MessageQueryTable(Of String) = MessageHelper.SetupTable()
'Dim kv As KeyValuePair(Of MessageQuery, String)
'For Each kv In mq
' '
' Dim xp As XPathMessageQuery = CType(kv.Key, XPathMessageQuery)
' Console.WriteLine("Value = {0}", kv.Value)
' Console.WriteLine("{0} = {1}", xp.Expression, xp.Evaluate(Of String)(mb))
'Next
Console.ReadLine()
End Sub
Private Shared Sub Evaluate(ByVal p1 As Object)
Throw New NotImplementedException
End Sub
End Class
Public Class MessageHelper
Shared messageBody As String = _
"<PurchaseOrder date='today'>" + _
"<Number>ABC-2009-XYZ</Number>" + _
"<Department>OnlineSales</Department>" + _
"<Items>" + _
"<Item product='nail' quantity='1'>item1</Item>" + _
"<Item product='screw' quantity='2'>item2</Item>" + _
"<Item product='brad' quantity='3'>" + _
"<SpecialOffer/>" + _
"Special item4" + _
"</Item>" + _
"<Item product='SpecialNails' quantity='9'>item5</Item>" + _
"<Item product='SpecialBrads' quantity='11'>" + _
"<SpecialOffer/>" + _
"Special item6" + _
"</Item>" + _
"<Item product='hammer' quantity='1'>item7</Item>" + _
"<Item product='wrench' quantity='2'>item8</Item>" + _
"</Items>" + _
"<Comments>" + _
"Rush order" + _
"</Comments>" + _
"</PurchaseOrder>"
Public Shared xpath As String = "/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@quantity = 1]"
Public Shared xpath2 As String = "/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@product = 'nail']"
Public Shared xpath3 As String = "/s12:Envelope/s12:Body/PurchaseOrder/Comments"
Public Shared xpath4 As String = "count(/s12:Envelope/s12:Body/PurchaseOrder/Items/Item)"
Public Shared xpath5 As String = "substring(string(/s12:Envelope/s12:Body/PurchaseOrder/Number),5,4)"
Public Shared xpath6 As String = "/s12:Envelope/s12:Body/PurchaseOrder/Department='OnlineSales'"
Public Shared xpath7 As String = "//PurchaseOrder/@date"
Public Shared xpath8 As String = "//SpecialOffer/ancestor::Item[@product = 'brad']"
' Invoke the correlation data function.
Public Shared xpath9 As String = "sm:correlation-data('CorrelationData1')"
Public Shared xpath10 As String = "sm:correlation-data('CorrelationData2')"
Public Shared xpath11 As String = "/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@quantity = 2]"
Public Shared Function CreateMessage() As Message
Dim stringReader As New StringReader(messageBody)
Dim xmlReader As New XmlTextReader(stringReader)
Dim message As Message = message.CreateMessage( _
MessageVersion.Soap12WSAddressing10, "http://purchaseorder", xmlReader)
' Add two correlation properties using lambda expressions. The property names are
' CorrelationData1 and CorrelationData2. The first goes to "value1" and the
' second to "value2". You can use your own property names and values.
Dim data As New CorrelationDataMessageProperty()
data.Add("CorrelationData1", Function() "value1")
data.Add("CorrelationData2", Function() "value2")
message.Properties(CorrelationDataMessageProperty.Name) = data
Return message
End Function
Public Shared Function SetupQueryCollection() As XPathMessageQueryCollection
' Create the query collection and add the XPath queries to it. To create
' the query, you must also use a new XPathMessageContext.
Dim queryCollection As New XPathMessageQueryCollection()
Dim context As XPathMessageContext = New XPathMessageContext()
queryCollection.Add(New XPathMessageQuery(xpath, context))
queryCollection.Add(New XPathMessageQuery(xpath2, context))
queryCollection.Add(New XPathMessageQuery(xpath3, context))
queryCollection.Add(New XPathMessageQuery(xpath4, context))
queryCollection.Add(New XPathMessageQuery(xpath5, context))
queryCollection.Add(New XPathMessageQuery(xpath6, context))
queryCollection.Add(New XPathMessageQuery(xpath7, context))
queryCollection.Add(New XPathMessageQuery(xpath8, context))
queryCollection.Add(New XPathMessageQuery(xpath9, context))
queryCollection.Add(New XPathMessageQuery(xpath10, context))
queryCollection.Add(New XPathMessageQuery(xpath11, context))
Return queryCollection
End Function
Public Shared Function SetupTable() As MessageQueryTable(Of String)
' This is optional code to demonstrate using a MessageQueryTable.
' Compare this to the MessageQueryCollection.
Dim table As MessageQueryTable(Of String) = New MessageQueryTable(Of String)()
Dim context As XPathMessageContext = New XPathMessageContext()
' The code adds a KeyValuePair to the table. Each pair requires
' a query used as the Key, and a value that is paired to the key.
table.Add(New XPathMessageQuery(xpath, context), "value10")
table.Add(New XPathMessageQuery(xpath2, context), "value20")
table.Add(New XPathMessageQuery(xpath3, context), "value30")
table.Add(New XPathMessageQuery(xpath4, context), "value40")
table.Add(New XPathMessageQuery(xpath5, context), "value50")
table.Add(New XPathMessageQuery(xpath6, context), "value60")
table.Add(New XPathMessageQuery(xpath7, context), "value70")
table.Add(New XPathMessageQuery(xpath8, context), "value80")
table.Add(New XPathMessageQuery(xpath9, context), "value90")
table.Add(New XPathMessageQuery(xpath10, context), "value100")
table.Add(New XPathMessageQuery(xpath11, context), "value110")
Return table
End Function
End Class
End Namespace