MessageQuery Kelas
Definisi
Penting
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Menentukan perilaku inti kelas yang digunakan untuk mencari data yang berkorelasi tertentu dalam pesan.
public ref class MessageQuery abstractpublic abstract class MessageQuerytype MessageQuery = classPublic MustInherit Class MessageQuery- Warisan
-
MessageQuery
- Turunan
Contoh
Contoh berikut membuat pesan dan kueri pesan JalurX. Kueri dievaluasi oleh XPathMessageQuery objek yang terkandung dalam XPathMessageQueryCollection objek. Hasil setiap kueri diuji menggunakan ResultType properti kelas XPathResult .
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
Keterangan
Kelas MessageQuery ini mirip MessageFilter dengan kelas . Namun, alih-alih mengembalikan kecocokan Evaluate , metode mengembalikan hasil evaluasi kueri terhadap pesan. Hasil kueri adalah nilai dalam pesan. Gunakan nilai sebagai kunci untuk menghubungkan pesan ke pesan lain. Untuk menambahkan properti baru untuk data, gunakan Add metode CorrelationDataMessageProperty kelas .
Catatan
Untuk implementasi konkret dari MessageQuery, lihat XPathMessageQuery kelas .
Menggunakan kelas XPathMessageQuery dan MessageQueryCollection
Anda dapat mengoptimalkan proses kueri dengan membuat sekumpulan objek kueri dan menyisipkannya ke dalam instans MessageQueryCollection kelas.
Catatan
Untuk implementasi konkret dari MessageQueryCollection, lihat XPathMessageQueryCollection kelas .
Penggunaan umum adalah mengisi koleksi dengan kueri yang memiliki predikat JalurX yang sama, tetapi itu hanya berbeda dalam nilai daun akhir. Misalnya, kueri JalurX berikut identik kecuali untuk klausul akhir. Kueri pertama untuk semua elemen yang memiliki atribut kuantitas diatur ke 1, dan kueri kedua untuk elemen dengan atribut produk diatur ke 'Contoso'):
"/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@quantity = 1]"
"/s12:Envelope/s12:Body/PurchaseOrder/Items/Item[@product = 'Contoso']"
Kelas ini MessageQueryCollection memungkinkan Anda membuat tabel kueri yang hanya sedikit berbeda, memungkinkan pemrosesan yang lebih efisien.
Atau, Anda dapat menggunakan MessageQueryTable<TItem> kelas untuk menyimpan dan mengevaluasi kueri pesan.
Konstruktor
| MessageQuery() |
Menginisialisasi instans baru kelas MessageQuery. |
Metode
| CreateMessageQueryCollection() |
Membuat kumpulan kueri yang mengembalikan jenis data tertentu yang terkait dengannya. |
| Equals(Object) |
Menentukan apakah objek yang ditentukan sama dengan objek saat ini. (Diperoleh dari Object) |
| Evaluate<TResult>(Message) |
Saat ditimpa di kelas turunan, menjalankan kueri terhadap pesan dan mengembalikan hasilnya. Tubuh tidak dapat dikueri. |
| Evaluate<TResult>(MessageBuffer) |
Saat ditimpa di kelas turunan, menjalankan kueri terhadap pesan dan mengembalikan hasilnya. |
| GetHashCode() |
Berfungsi sebagai fungsi hash default. (Diperoleh dari Object) |
| GetType() |
Mendapatkan dari instans Type saat ini. (Diperoleh dari Object) |
| MemberwiseClone() |
Membuat salinan dangkal dari saat ini Object. (Diperoleh dari Object) |
| ToString() |
Mengembalikan string yang mewakili objek saat ini. (Diperoleh dari Object) |
Berlaku untuk
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