Service Bus Console App .NET Core Sample

Program.cs

using Microsoft.Azure.ServiceBus;
using System;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace SBQuickStart
{
    class Program
    {
        static IQueueClient queueClient;

        static void Main(string[] args)
        {
            var serviceBusConnectionString = string.Empty;
            var queueName = string.Empty;

            for (var i = 0; i < args.Length; i++)
            {
                switch (args[i])
                {
                    case "-ConnectionString":
                        Console.WriteLine($"ConnectionString: {args[i+1]}");
                        serviceBusConnectionString = args[i + 1]; // Alternatively enter your connection string here.
                        break;
                    case "-QueueName":
                        Console.WriteLine($"QueueName: {args[i+1]}");
                        queueName = args[i + 1]; // Alternatively enter your queue name here.
                        break;
                }
            }

            if (!string.IsNullOrEmpty(serviceBusConnectionString) && !string.IsNullOrEmpty(queueName))
                MainAsync(serviceBusConnectionString, queueName).GetAwaiter().GetResult();
            else
            {
                Console.WriteLine("Specify -ConnectionString and -QueueName to execute the example.");
                Console.ReadKey();
            }                            
        }

        static async Task MainAsync(string serviceBusConnectionString, string queueName)
        {
            const int numberOfMessages = 10;
            queueClient = new QueueClient(serviceBusConnectionString, queueName);

            Console.WriteLine("======================================================");
            Console.WriteLine("Press any key to exit when complete");
            Console.WriteLine("======================================================");

            // Register QueueClient's MessageHandler and receive messages in a loop
            // RegisterOnMessageHandlerAndReceiveMessages();

            // Send Messages
            await SendMessagesAsync(numberOfMessages);

            Console.ReadKey();

            await queueClient.CloseAsync();
        }

        static void RegisterOnMessageHandlerAndReceiveMessages()
        {
            // Configure the MessageHandler Options in terms of exception handling, number of concurrent messages to deliver etc.
            var messageHandlerOptions = new MessageHandlerOptions(ExceptionReceivedHandler)
            {
                // Maximum number of Concurrent calls to the callback `ProcessMessagesAsync`, set to 1 for simplicity.
                // Set it according to how many messages the application wants to process in parallel.
                MaxConcurrentCalls = 1,

                // Indicates whether MessagePump should automatically complete the messages after returning from User Callback.
                // False below indicates the Complete will be handled by the User Callback as in `ProcessMessagesAsync` below.
                AutoComplete = false
            };

            // Register the function that will process messages
            queueClient.RegisterMessageHandler(ProcessMessagesAsync, messageHandlerOptions);
        }

        static async Task ProcessMessagesAsync(Message message, CancellationToken token)
        {
            // Process the message
            Console.WriteLine($"Received message: SequenceNumber:{message.SystemProperties.SequenceNumber} Body:{Encoding.UTF8.GetString(message.Body)}");

            // Complete the message so that it is not received again.
            // This can be done only if the queueClient is created in ReceiveMode.PeekLock mode (which is default).
            await queueClient.CompleteAsync(message.SystemProperties.LockToken);

            // Note: Use the cancellationToken passed as necessary to determine if the queueClient has already been closed.
            // If queueClient has already been Closed, you may chose to not call CompleteAsync() or AbandonAsync() etc. calls 
            // to avoid unnecessary exceptions.
        }

        // Use this Handler to look at the exceptions received on the MessagePump
        static Task ExceptionReceivedHandler(ExceptionReceivedEventArgs exceptionReceivedEventArgs)
        {
            Console.WriteLine($"Message handler encountered an exception {exceptionReceivedEventArgs.Exception}.");
            var context = exceptionReceivedEventArgs.ExceptionReceivedContext;
            Console.WriteLine("Exception context for troubleshooting:");
            Console.WriteLine($"- Endpoint: {context.Endpoint}");
            Console.WriteLine($"- Entity Path: {context.EntityPath}");
            Console.WriteLine($"- Executing Action: {context.Action}");
            return Task.CompletedTask;
        }

        static async Task SendMessagesAsync(int numberOfMessagesToSend)
        {
            try
            {
                for (var i = 0; i < numberOfMessagesToSend; i++)
                {
                    // Create a new message to send to the queue
                    var messageBody = $"Message {i}";
                    var message = new Message(Encoding.UTF8.GetBytes(messageBody));

                    // Write the body of the message to the console
                    Console.WriteLine($"Sending message: {messageBody}");

                    // Send the message to the queue
                    await queueClient.SendAsync(message);
                }
            }
            catch (Exception exception)
            {
                Console.WriteLine($"{DateTime.Now} :: Exception: {exception.Message}");
            }
        }
    }
}