.NET Comprehensive Tutorial

Introduction to .NET

.NET is a free, open-source developer platform for building many different types of applications. It supports multiple languages, editors, and libraries to build for web, mobile, desktop, gaming, and IoT.

Setting Up .NET Environment

To get started with .NET, you need to install the .NET SDK. Follow these steps:

Verify the installation by running the following command in your terminal:

5.0.102

Creating Your First .NET Application

Let's create a simple console application using .NET:

Open your terminal and run the following commands:

Hello World!

This will create a new console application, navigate into the project directory, and run the application.

Introduction to Kafka

Apache Kafka is an open-source stream-processing software platform developed by LinkedIn and donated to the Apache Software Foundation, written in Scala and Java. The project aims to provide a unified, high-throughput, low-latency platform for handling real-time data feeds.

Integrating .NET with Kafka

To integrate .NET with Kafka, we will use the Confluent.Kafka library. Follow these steps:

First, add the Confluent.Kafka package to your project:

Producing Messages to Kafka

Let's create a simple producer that sends messages to a Kafka topic:

using System;
using Confluent.Kafka;

class Program
{
    public static void Main(string[] args)
    {
        var config = new ProducerConfig { BootstrapServers = "localhost:9092" };

        using (var producer = new ProducerBuilder<string, string>(config).Build())
        {
            try
            {
                var result = producer.ProduceAsync("my-topic", new Message<string, string> { Key = "key", Value = "value" }).GetAwaiter().GetResult();
                Console.WriteLine($"Message sent to topic {result.Topic}, partition {result.Partition}, offset {result.Offset}");
            }
            catch (ProduceException<string, string> e)
            {
                Console.WriteLine($"Failed to deliver message: {e.Message} [{e.Error.Code}]");
            }
        }
    }
}
                

This code creates a Kafka producer that sends a message with a key and value to the "my-topic" topic.

Consuming Messages from Kafka

Now, let's create a simple consumer that reads messages from a Kafka topic:

using System;
using Confluent.Kafka;

class Program
{
    public static void Main(string[] args)
    {
        var config = new ConsumerConfig
        {
            GroupId = "test-consumer-group",
            BootstrapServers = "localhost:9092",
            AutoOffsetReset = AutoOffsetReset.Earliest
        };

        using (var consumer = new ConsumerBuilder<string, string>(config).Build())
        {
            consumer.Subscribe("my-topic");

            while (true)
            {
                var consumeResult = consumer.Consume();
                Console.WriteLine($"Consumed message '{consumeResult.Message.Value}' at: '{consumeResult.TopicPartitionOffset}'.");
            }
        }
    }
}
                

This code creates a Kafka consumer that subscribes to the "my-topic" topic and prints the consumed messages to the console.

Conclusion

In this tutorial, we covered the basics of setting up a .NET environment, creating a simple .NET application, and integrating .NET with Kafka for producing and consuming messages. With these fundamentals, you can start building more complex and robust applications using .NET and Kafka.