Eksempel: Vedvarende kølyttefunktion
Udgivet: januar 2017
Gælder for: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2016, Dynamics CRM Online
Denne eksempelkode er for Microsoft Dynamics 365 (online og i det lokale miljø). Hent SDK-pakken til Microsoft Dynamics CRM. Denne kode findes på følgende placering, når du henter pakken:
SampleCode\CS\Azure\PersistentQueueListener\PersistentQueueListener.cs
Krav
Denne eksempelkode kræver følgende yderligere Microsoft Visual Studio-projektreference: Microsoft.ServiceBus.Microsoft.ServiceBus.dll-assembly findes i Microsoft Azure SDK.
Demonstrerer
I dette eksempel vises, hvordan du skriver et Microsoft Azure-servicebus-lytteprogram til en vedvarende køs slutpunktskontrakt.
Lyttefunktionen venter på, at en Microsoft Dynamics 365-meddelelse sendes til servicebussen og er tilgængelig i slutpunktskøen. Når en meddelelse er tilgængelig i køen, læser lyttefunktionen meddelelsen, udskriver Microsoft Dynamics 365-kørselskonteksten i meddelelsen til konsollen og sletter meddelelsen fra køen.
Eksempel
using System;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Collections.Generic;
using System.Text;
using Microsoft.ServiceBus;
using Microsoft.ServiceBus.Messaging;
using Microsoft.Xrm.Sdk;
namespace Microsoft.Crm.Sdk.Samples
{
class Program
{
public static void Main(string[] args)
{
Consumer consumer = new Consumer();
consumer.CreateQueueClient();
consumer.ProcessMessages();
consumer.DeleteQueue();
}
}
internal class Consumer
{
private const String MyQueuePath = "MyQueue";
private QueueDescription queueDescription;
private QueueClient queueClient;
private Uri namespaceUri;
private TransportClientEndpointBehavior credential;
public Consumer()
{
Console.Write("Your Service Namespace: ");
string serviceNamespace = Console.ReadLine();
Console.Write("Your Issuer Name: ");
string issuerName = Console.ReadLine();
Console.Write("Your Issuer Secret: ");
string issuerSecret = Console.ReadLine();
// Configure queue settings.
this.queueDescription = new QueueDescription(MyQueuePath);
// Setting Max Size and TTL for demonstration purpose
// but can be changed per user discretion to suite their system needs.
// Refer service bus documentation to understand the limitations.
// Setting Queue max size to 1GB where as default Max Size is 5GB.
this.queueDescription.MaxSizeInMegabytes = 1024;
// Setting message TTL to 5 days where as default TTL is 14 days.
this.queueDescription.DefaultMessageTimeToLive = TimeSpan.FromDays(5);
// Create management credentials.
this.credential = new TransportClientEndpointBehavior()
{
TokenProvider = TokenProvider.CreateSharedSecretTokenProvider(issuerName, issuerSecret)
};
// Create the URI for the queue.
this.namespaceUri = ServiceBusEnvironment.CreateServiceUri("sb", serviceNamespace, String.Empty);
Console.WriteLine("Service Bus Namespace Uri address '{0}'", this.namespaceUri.AbsoluteUri);
}
public void CreateQueueClient()
{
// get the existing queue or create a new queue if it doesn't exist.
this.queueClient = GetOrCreateQueue(namespaceUri, this.credential.TokenProvider);
}
public void ProcessMessages()
{
// Get receive mode (PeekLock or ReceiveAndDelete) from queueClient.
ReceiveMode mode = this.queueClient.Mode;
while (true)
{
Console.Write("Press [Enter] to retrieve a message from the queue (type quit to exit): ");
string line = Console.ReadLine();
if (!string.IsNullOrEmpty(line) && string.Equals(line, "quit", StringComparison.OrdinalIgnoreCase))
{
break;
}
// Retrieve a message from the queue.
Console.WriteLine("Waiting for a message from the queue... ");
BrokeredMessage message;
try
{
message = this.queueClient.Receive();
// Check if the message received.
if (message != null)
{
try
{
// Verify EntityLogicalName and RequestName message properties
// to only process specific message sent from Microsoft Dynamics CRM.
string keyRoot = "https://schemas.microsoft.com/xrm/2011/Claims/";
string entityLogicalNameKey = "EntityLogicalName";
string requestNameKey = "RequestName";
object entityLogicalNameValue;
object requestNameValue;
message.Properties.TryGetValue(keyRoot + entityLogicalNameKey, out entityLogicalNameValue);
message.Properties.TryGetValue(keyRoot + requestNameKey, out requestNameValue);
// Filter message with specific message properties. i.e. EntityLogicalName=letter and RequestName=Create
if (entityLogicalNameValue != null && requestNameValue != null)
{
if (entityLogicalNameValue.ToString() == "letter" && requestNameValue.ToString() == "Create")
{
Console.WriteLine("--------------------------------");
Console.WriteLine(string.Format("Message received: Id = {0}", message.MessageId));
// Display message properties that are set on the brokered message.
Utility.PrintMessageProperties(message.Properties);
// Display body details.
Utility.Print(message.GetBody<RemoteExecutionContext>());
Console.WriteLine("--------------------------------");
}
else
{
continue;
}
}
else
{
continue;
}
// If receive mode is PeekLock then set message complete to remove message from queue.
if (mode == ReceiveMode.PeekLock)
{
message.Complete();
}
}
catch (System.Exception ex)
{
// Indicate a problem, unlock message in queue.
if (mode == ReceiveMode.PeekLock)
{
message.Abandon();
}
Console.WriteLine(ex.Message);
continue;
}
}
else
{
break;
}
}
catch (System.TimeoutException e)
{
Console.WriteLine(e.Message);
continue;
}
catch (System.ServiceModel.FaultException e)
{
Console.WriteLine(e.Message);
continue;
}
}
}
public void DeleteQueue()
{
DeleteQueueInternal(namespaceUri, MyQueuePath, credential.TokenProvider);
}
private void DeleteQueueInternal(Uri address, string path, TokenProvider tokenProvider)
{
var settings = new NamespaceManagerSettings() { TokenProvider = tokenProvider };
var namespaceClient = new ServiceBus.NamespaceManager(address, settings);
try
{
namespaceClient.DeleteQueue(path);
Console.WriteLine("Queue deleted successfully.");
}
catch (FaultException e)
{
Console.WriteLine("Exception when deleting queue.. {0}", e);
}
}
private QueueClient GetOrCreateQueue(Uri namespaceUri, TokenProvider tokenProvider)
{
NamespaceManager namespaceClient = new NamespaceManager(namespaceUri, tokenProvider);
// Create queue if not already exist.
if (!namespaceClient.QueueExists(MyQueuePath))
{
namespaceClient.CreateQueue(this.queueDescription);
Console.WriteLine("Queue created.");
}
else
{
Console.WriteLine("Queue already exists.");
}
MessagingFactory factory = MessagingFactory.Create(namespaceUri, tokenProvider);
Console.WriteLine("Creating queue client...");
return factory.CreateQueueClient(MyQueuePath, ReceiveMode.PeekLock);
}
}
internal static class Utility
{
public static void Print(RemoteExecutionContext context)
{
if (context == null)
{
Console.WriteLine("Context is null.");
return;
}
Console.WriteLine("UserId: {0}", context.UserId);
Console.WriteLine("OrganizationId: {0}", context.OrganizationId);
Console.WriteLine("OrganizationName: {0}", context.OrganizationName);
Console.WriteLine("MessageName: {0}", context.MessageName);
Console.WriteLine("Stage: {0}", context.Stage);
Console.WriteLine("Mode: {0}", context.Mode);
Console.WriteLine("PrimaryEntityName: {0}", context.PrimaryEntityName);
Console.WriteLine("SecondaryEntityName: {0}", context.SecondaryEntityName);
Console.WriteLine("BusinessUnitId: {0}", context.BusinessUnitId);
Console.WriteLine("CorrelationId: {0}", context.CorrelationId);
Console.WriteLine("Depth: {0}", context.Depth);
Console.WriteLine("InitiatingUserId: {0}", context.InitiatingUserId);
Console.WriteLine("IsExecutingOffline: {0}", context.IsExecutingOffline);
Console.WriteLine("IsInTransaction: {0}", context.IsInTransaction);
Console.WriteLine("IsolationMode: {0}", context.IsolationMode);
Console.WriteLine("Mode: {0}", context.Mode);
Console.WriteLine("OperationCreatedOn: {0}", context.OperationCreatedOn.ToString());
Console.WriteLine("OperationId: {0}", context.OperationId);
Console.WriteLine("PrimaryEntityId: {0}", context.PrimaryEntityId);
Console.WriteLine("OwningExtension LogicalName: {0}", context.OwningExtension.LogicalName);
Console.WriteLine("OwningExtension Name: {0}", context.OwningExtension.Name);
Console.WriteLine("OwningExtension Id: {0}", context.OwningExtension.Id);
Console.WriteLine("SharedVariables: {0}", (context.SharedVariables == null ? "NULL" :
SerializeParameterCollection(context.SharedVariables)));
Console.WriteLine("InputParameters: {0}", (context.InputParameters == null ? "NULL" :
SerializeParameterCollection(context.InputParameters)));
Console.WriteLine("OutputParameters: {0}", (context.OutputParameters == null ? "NULL" :
SerializeParameterCollection(context.OutputParameters)));
Console.WriteLine("PreEntityImages: {0}", (context.PreEntityImages == null ? "NULL" :
SerializeEntityImageCollection(context.PreEntityImages)));
Console.WriteLine("PostEntityImages: {0}", (context.PostEntityImages == null ? "NULL" :
SerializeEntityImageCollection(context.PostEntityImages)));
}
#region Private methods.
private static string SerializeEntity(Entity e)
{
StringBuilder sb = new StringBuilder();
sb.Append(Environment.NewLine);
sb.Append(" LogicalName: " + e.LogicalName);
sb.Append(Environment.NewLine);
sb.Append(" EntityId: " + e.Id);
sb.Append(Environment.NewLine);
sb.Append(" Attributes: [");
foreach (KeyValuePair<string, object> parameter in e.Attributes)
{
sb.Append(parameter.Key + ": " + parameter.Value + "; ");
}
sb.Append("]");
return sb.ToString();
}
private static string SerializeParameterCollection(ParameterCollection parameterCollection)
{
StringBuilder sb = new StringBuilder();
foreach (KeyValuePair<string, object> parameter in parameterCollection)
{
if (parameter.Value != null && parameter.Value.GetType() == typeof(Entity))
{
Entity e = (Entity)parameter.Value;
sb.Append(parameter.Key + ": " + SerializeEntity(e));
}
else
{
sb.Append(parameter.Key + ": " + parameter.Value + "; ");
}
}
return sb.ToString();
}
private static string SerializeEntityImageCollection(EntityImageCollection entityImageCollection)
{
StringBuilder sb = new StringBuilder();
foreach (KeyValuePair<string, Entity> entityImage in entityImageCollection)
{
sb.Append(Environment.NewLine);
sb.Append(entityImage.Key + ": " + SerializeEntity(entityImage.Value));
}
return sb.ToString();
}
#endregion
internal static void PrintMessageProperties(IDictionary<string, object> iDictionary)
{
if (iDictionary.Count == 0)
{
Console.WriteLine("No Message properties found.");
return;
}
foreach (var item in iDictionary)
{
String key = (item.Key != null) ? item.Key.ToString() : "";
String value = (item.Value != null)? item.Value.ToString() : "";
Console.WriteLine( key + " " + value);
}
}
}
}
Se også
Skrive et lyttefunktionsprogram til en Microsoft Azure-løsning
Eksempelkode for Microsoft Dynamics 365- og Microsoft Azure-integration
Microsoft Dynamics 365
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