MessageQuery Klasa

  • Odwołanie

Definicja

Przestrzeń nazw:
System.ServiceModel.Dispatcher
Zestaw:
System.ServiceModel.dll

Definiuje podstawowe zachowanie klas używanych do wyszukiwania określonych korelujących danych w komunikacie.

public ref class MessageQuery abstract
public abstract class MessageQuery
type MessageQuery = class
Public MustInherit Class MessageQuery
Dziedziczenie
Object
MessageQuery
Pochodne

Przykłady

Poniższy przykład tworzy zapytania dotyczące komunikatów i komunikatów XPath. Zapytania są oceniane przez XPathMessageQuery obiekty zawarte w XPathMessageQueryCollection obiekcie. Wyniki każdego zapytania są testowane przy użyciu ResultType właściwości XPathResult klasy .

using System;
using System.IO;
using System.Xml;
using System.ServiceModel.Dispatcher;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Xml.XPath;

namespace MessageQueryExamples
{

    class Program
    {
        static void Main(string[] args)
        {
            // The XPathMessageQueryCollection inherits from MessageQueryCollection.
            XPathMessageQueryCollection queryCollection = MessageHelper.SetupQueryCollection();

            // Create a message and a copy of the message. You must create a buffered copy to access the message body.
            Message mess = MessageHelper.CreateMessage();
            MessageBuffer mb = mess.CreateBufferedCopy(int.MaxValue);

            // Evaluate every query in the collection.
            foreach (XPathMessageQuery q in queryCollection)
            {
                // Evaluate the query. Note the result type is an XPathResult.
                XPathResult qPathResult = q.Evaluate<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)
                    Console.WriteLine("{0} = {1}", q.Expression, qPathResult.GetResultAsString());

                if (qPathResult.ResultType == XPathResultType.NodeSet)
                {
                    // Iterate through the node set.
                    XPathNodeIterator ns = qPathResult.GetResultAsNodeset();
                    foreach (XPathNavigator n in ns)
                        Console.WriteLine("\t{0} = {1}", q.Expression, n.Value);
                }
                if (qPathResult.ResultType == XPathResultType.Number)
                    Console.WriteLine("\t{0} = {1}", q.Expression, qPathResult.GetResultAsNumber());

                if (qPathResult.ResultType == XPathResultType.Boolean)
                    Console.WriteLine("\t{0} ={1}", q.Expression, qPathResult.GetResultAsBoolean());

                if (qPathResult.ResultType == XPathResultType.Error)
                    Console.WriteLine("\tError!");
            }

            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.

            //MessageQueryTable<string> mq = MessageHelper.SetupTable();
            //foreach (KeyValuePair<MessageQuery, string> kv in mq)
            //{
            //    XPathMessageQuery xp = (XPathMessageQuery)kv.Key;
            //    Console.WriteLine("Value = {0}", kv.Value);
            //    Console.WriteLine("{0} = {1}", xp.Expression, xp.Evaluate<string>(mb));
            //}

            Console.ReadLine();
        }
    }

    public class MessageHelper
    {
        static string messageBody =
              "<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 static string xpath = "/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@quantity = 1]";
        public static string xpath2 = "/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@product = 'nail']";
        public static string xpath3 = "/s12:Envelope/s12:Body/PurchaseOrder/Comments";
        public static string xpath4 = "count(/s12:Envelope/s12:Body/PurchaseOrder/Items/Item)";
        public static string xpath5 = "substring(string(/s12:Envelope/s12:Body/PurchaseOrder/Number),5,4)";
        public static string xpath6 = "/s12:Envelope/s12:Body/PurchaseOrder/Department='OnlineSales'";
        public static string xpath7 = "//PurchaseOrder/@date";
        public static string xpath8 = "//SpecialOffer/ancestor::Item[@product = 'brad']";

        // Invoke the correlation data function.
        public static string xpath9 = "sm:correlation-data('CorrelationData1')";
        public static string xpath10 = "sm:correlation-data('CorrelationData2')";

        public static string xpath11 = "/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@quantity = 2]";

        public static Message CreateMessage()
        {
            StringReader stringReader = new StringReader(messageBody);
            XmlTextReader xmlReader = new XmlTextReader(stringReader);
            Message 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.
            CorrelationDataMessageProperty data = new CorrelationDataMessageProperty();

            data.Add("CorrelationData1", () => "value1");
            data.Add("CorrelationData2", () => "value2");
            message.Properties[CorrelationDataMessageProperty.Name] = data;

            return message;
        }

        public static XPathMessageQueryCollection SetupQueryCollection()
        {
            // Create the query collection and add the XPath queries to it. To create
            // the query, you must also use a new XPathMessageContext.

            XPathMessageQueryCollection queryCollection = new XPathMessageQueryCollection();

            XPathMessageContext context = 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;
        }

        public static MessageQueryTable<string> SetupTable()
        {
            // This is optional code to demonstrate using a MessageQueryTable.
            // Compare this to the MessageQueryCollection.
            MessageQueryTable<string> table = new MessageQueryTable<string>();
            XPathMessageContext context = 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;
        }
    }
}

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

Uwagi

Klasa jest podobna MessageQueryMessageFilter do klasy . Jednak zamiast zwracać dopasowania, Evaluate metoda zwraca wyniki oceny zapytania względem komunikatu. Wynikiem zapytania jest wartość w komunikacie. Użyj wartości jako klucza, aby skorelować komunikat z innymi komunikatami. Aby dodać nową właściwość dla danych, użyj Add metody CorrelationDataMessageProperty klasy .

Uwaga

Aby zapoznać się z konkretną implementacją klasy MessageQuery, zobacz klasę XPathMessageQuery .

Używanie klas XPathMessageQuery i MessageQueryCollection

Proces zapytania można zoptymalizować, tworząc zestaw obiektów zapytań i wstawiając je do wystąpienia MessageQueryCollection klasy.

Uwaga

Aby zapoznać się z konkretną implementacją klasy MessageQueryCollection, zobacz klasę XPathMessageQueryCollection .

Typowym użyciem jest wypełnienie kolekcji zapytaniami, które mają ten sam predykat XPath, ale różnią się tylko w końcowej wartości liścia. Na przykład następujące zapytania XPath są identyczne z wyjątkiem końcowej klauzuli. Pierwsze zapytanie dotyczące wszystkich elementów, które mają atrybut quantity ustawiony na 1, a drugie zapytanie o elementy z atrybutem produktu ustawionym na "Contoso"):

"/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@quantity = 1]"  
"/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@product = 'Contoso']"

Klasa MessageQueryCollection umożliwia tworzenie tabel zapytań, które różnią się tylko nieznacznie, co umożliwia bardziej wydajne przetwarzanie.

Możesz też użyć MessageQueryTable<TItem> klasy do przechowywania i oceniania zapytań dotyczących komunikatów.

Konstruktory

MessageQuery()

Inicjuje nowe wystąpienie klasy MessageQuery.

Metody

CreateMessageQueryCollection()

Tworzy kolekcję zapytań, które zwracają określony typ skojarzonych z nim danych.
Equals(Object)

Określa, czy dany obiekt jest taki sam, jak bieżący obiekt.

(Odziedziczone po Object)
Evaluate<TResult>(Message)

Po zastąpieniu w klasie pochodnej uruchamia zapytanie względem komunikatu i zwraca wynik. Nie można odpytować treści.
Evaluate<TResult>(MessageBuffer)

Po zastąpieniu w klasie pochodnej uruchamia zapytanie względem komunikatu i zwraca wynik.
GetHashCode()

Służy jako domyślna funkcja skrótu.

(Odziedziczone po Object)
GetType()

Type Pobiera wartość bieżącego wystąpienia.

(Odziedziczone po Object)
MemberwiseClone()

Tworzy płytkią kopię bieżącego Objectelementu .

(Odziedziczone po Object)
ToString()

Zwraca ciąg reprezentujący bieżący obiekt.

(Odziedziczone po Object)

Dotyczy

Zobacz też