Step-by-step guide on how to use the .Net Aspire Kafka component in Visual Studio. .Net Aspire framework is used to develop cloud and production-ready distributed applications. It consists of components to handle cloud-native concerns such as Redis, Postgres etc. Prerequisites Install .Net 8
Install Visual Studio 2022 version 17 or higher
.Net Aspire Workload
Container runtime such as Docker Desktop 10 Day .Net Aspire Challenge Objectives Learn how to create a starter project using .Net Aspire with the Apache Kafka component. Github Sample: The solution structure is divided into the following projects: DotnetAspireChallenge.ApiService
DotnetAspireChallenge.AppHost
DotnetAspireChallenge.ServiceDefaults
DotnetAspireChallenge.Web Getting Started Step 1: Install the following NuGet package Install the following Nuget package into the subsequent project “DotnetAspireChallenge.AppHost” dotnet add package Aspire.Hosting.Kafka In the above project, register Kafka UI as shown below var messaging = builder.AddKafka("messaging")
```                           .WithKafkaUI();

Then finally add a reference to both the Producer and Consumer where the producer is “DotnetAspireChallenge.ApiService” and the consumer is “DotnetAspireChallenge.Web” project respectively.
```csharp
    var apiService = builder.AddProject<Projects.DotnetAspireChallenge_ApiService>("apiservice")
        .WithReference(messaging);
    
    
    
    builder.AddProject<Projects.DotnetAspireChallenge_Web>("webfrontend")
        .WithExternalHttpEndpoints()
        .WithReference(cache)
        .WithReference(apiService)
        .WithReference(messaging); Step 2: Add dependency of Kafka Producer Add the dependency in the Program.cs file of the project “**DotnetAspireChallenge.**ApiService” builder.AddKafkaProducer<string, string>("messaging"); and add a relevant minimal API endpoint using the following code. public static class AspireKafkaExtension
    {
        public static void MapAspireKafkaEndpoint(this WebApplication app)
        {
            app.MapGet("/send", async (IProducer<string, string> services, string key, string value) =>
            {
                try
                {
                    var message = new Message<string, string> { Key = key, Value = value };
                    DeliveryResult<string, string>? result = await services.ProduceAsync("messaging", message);
                    return result;
                }
                catch (Exception ex)
                {
    
                    throw;
                }
    
            });
        }
    } The endpoint takes two parameters namely key and value as route values, and produces the message on the docker-hosted Kafka server. https://localhost:7313/send?key=key&value=1 Step 3: Add dependency of Kafka Consumer Now move “DotnetAspireChallenge.Web” project wherein register as a Kafka producer builder.AddKafkaConsumer<string, string>("messaging", options =>
    {
        options.Config.GroupId = "my-consumer-group";
        options.Config.AutoOffsetReset = AutoOffsetReset.Earliest;
        options.Config.EnableAutoCommit = false;
    }); Note: It's mandatory to provide a default group ID. Step 4: Create a Razor Page Create a basic razor page named “KafkaConsumer.razor” to show the consumed message from the Kafka server. @page "/kafka"
    @attribute [StreamRendering(true)]
    @attribute [OutputCache(Duration = 5)]
    @using Confluent.Kafka
    <h3>KafkaConsumer</h3>
    
    @inject KafkaConsumeMessageClient kafaConsumeMessageClient
    <PageTitle>Kafka Consumed Message</PageTitle>
    
    <h1>Kafka</h1>
    
    <p>This component demonstrates showing data loaded from a backend API service.</p>
    
    @if (consumedMessage == null)
    {
        <p><em>Loading...</em></p>
    }
    else
    {
        <table class="table">
            <thead>
                <tr>
                    <th>Topic</th>
                    <th>Value</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>@consumedMessage.Topic</td>
                    <td>@consumedMessage.Value</td>
                </tr>
    
            </tbody>
        </table>
    }
    @code {
        private ConsumeResult<string, string>? consumedMessage;
    
        protected override async Task OnInitializedAsync() => consumedMessage = kafaConsumeMessageClient.GetKafkaMessage();
    } Step 5: Configure HttpCall to the ApiService public class KafkaConsumeMessageClient(HttpClient httpClient, IConsumer<string, string> _consumer)
    {
    
        public ConsumeResult<string, string>? GetKafkaMessage(CancellationToken cancellationToken = default)
        {
            ConsumeResult<string, string>? deliveryResult = null;
            _consumer.Subscribe("messaging");
            deliveryResult = _consumer.Consume(TimeSpan.FromSeconds(10));
    
            return deliveryResult;
        }
    } Kafka Produce Demo Kafka UI Demo Kafka Consume Demo Github Project: GitHub - ssukhpinder/DotnetAspireChallenge: 10 Day .Net Aspire Challenge
Cheatsheet: Cheat Sheets — .Net Step-by-step guide on how to use the .Net Aspire Kafka component in Visual Studio. .Net Aspire framework is used to develop cloud and production-ready distributed applications. It consists of components to handle cloud-native concerns such as Redis, Postgres etc. Prerequisites Install .Net 8 Install Visual Studio 2022 version 17 or higher .Net Aspire Workload Container runtime such as Docker Desktop Install .Net 8 .Net 8 Install Visual Studio 2022 version 17 or higher Visual Studio 2022 .Net Aspire Workload Container runtime such as Docker Desktop Docker Desktop 10 Day .Net Aspire Challenge 10 Day .Net Aspire Challenge 10 Day .Net Aspire Challenge Objectives Learn how to create a starter project using .Net Aspire with the Apache Kafka component. Github Sample : The solution structure is divided into the following projects: Github Sample DotnetAspireChallenge.ApiService DotnetAspireChallenge.AppHost DotnetAspireChallenge.ServiceDefaults DotnetAspireChallenge.Web DotnetAspireChallenge.ApiService DotnetAspireChallenge.AppHost DotnetAspireChallenge.ServiceDefaults DotnetAspireChallenge.Web Getting Started Step 1: Install the following NuGet package Install the following Nuget package into the subsequent project “ DotnetAspireChallenge.AppHost ” DotnetAspireChallenge.AppHost dotnet add package Aspire.Hosting.Kafka dotnet add package Aspire.Hosting.Kafka In the above project, register Kafka UI as shown below var messaging = builder.AddKafka("messaging")
```                           .WithKafkaUI();

Then finally add a reference to both the Producer and Consumer where the producer is “DotnetAspireChallenge.ApiService” and the consumer is “DotnetAspireChallenge.Web” project respectively.
```csharp
    var apiService = builder.AddProject<Projects.DotnetAspireChallenge_ApiService>("apiservice")
        .WithReference(messaging);
    
    
    
    builder.AddProject<Projects.DotnetAspireChallenge_Web>("webfrontend")
        .WithExternalHttpEndpoints()
        .WithReference(cache)
        .WithReference(apiService)
        .WithReference(messaging); var messaging = builder.AddKafka("messaging")
```                           .WithKafkaUI();

Then finally add a reference to both the Producer and Consumer where the producer is “DotnetAspireChallenge.ApiService” and the consumer is “DotnetAspireChallenge.Web” project respectively.
```csharp
    var apiService = builder.AddProject<Projects.DotnetAspireChallenge_ApiService>("apiservice")
        .WithReference(messaging);
    
    
    
    builder.AddProject<Projects.DotnetAspireChallenge_Web>("webfrontend")
        .WithExternalHttpEndpoints()
        .WithReference(cache)
        .WithReference(apiService)
        .WithReference(messaging); Step 2: Add dependency of Kafka Producer Add the dependency in the Program.cs file of the project “**DotnetAspireChallenge.**ApiService” builder.AddKafkaProducer<string, string>("messaging"); builder.AddKafkaProducer<string, string>("messaging"); and add a relevant minimal API endpoint using the following code. public static class AspireKafkaExtension
    {
        public static void MapAspireKafkaEndpoint(this WebApplication app)
        {
            app.MapGet("/send", async (IProducer<string, string> services, string key, string value) =>
            {
                try
                {
                    var message = new Message<string, string> { Key = key, Value = value };
                    DeliveryResult<string, string>? result = await services.ProduceAsync("messaging", message);
                    return result;
                }
                catch (Exception ex)
                {
    
                    throw;
                }
    
            });
        }
    } public static class AspireKafkaExtension
    {
        public static void MapAspireKafkaEndpoint(this WebApplication app)
        {
            app.MapGet("/send", async (IProducer<string, string> services, string key, string value) =>
            {
                try
                {
                    var message = new Message<string, string> { Key = key, Value = value };
                    DeliveryResult<string, string>? result = await services.ProduceAsync("messaging", message);
                    return result;
                }
                catch (Exception ex)
                {
    
                    throw;
                }
    
            });
        }
    } The endpoint takes two parameters namely key and value as route values, and produces the message on the docker-hosted Kafka server. https://localhost:7313/send?key=key&value=1 https://localhost:7313/send?key=key&value=1 Step 3: Add dependency of Kafka Consumer Now move “ DotnetAspireChallenge.Web ” project wherein register as a Kafka producer DotnetAspireChallenge.Web builder.AddKafkaConsumer<string, string>("messaging", options =>
    {
        options.Config.GroupId = "my-consumer-group";
        options.Config.AutoOffsetReset = AutoOffsetReset.Earliest;
        options.Config.EnableAutoCommit = false;
    }); builder.AddKafkaConsumer<string, string>("messaging", options =>
    {
        options.Config.GroupId = "my-consumer-group";
        options.Config.AutoOffsetReset = AutoOffsetReset.Earliest;
        options.Config.EnableAutoCommit = false;
    }); Note: It's mandatory to provide a default group ID. Note: It's mandatory to provide a default group ID. Step 4: Create a Razor Page Create a basic razor page named “KafkaConsumer.razor” to show the consumed message from the Kafka server. @page "/kafka"
    @attribute [StreamRendering(true)]
    @attribute [OutputCache(Duration = 5)]
    @using Confluent.Kafka
    <h3>KafkaConsumer</h3>
    
    @inject KafkaConsumeMessageClient kafaConsumeMessageClient
    <PageTitle>Kafka Consumed Message</PageTitle>
    
    <h1>Kafka</h1>
    
    <p>This component demonstrates showing data loaded from a backend API service.</p>
    
    @if (consumedMessage == null)
    {
        <p><em>Loading...</em></p>
    }
    else
    {
        <table class="table">
            <thead>
                <tr>
                    <th>Topic</th>
                    <th>Value</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>@consumedMessage.Topic</td>
                    <td>@consumedMessage.Value</td>
                </tr>
    
            </tbody>
        </table>
    }
    @code {
        private ConsumeResult<string, string>? consumedMessage;
    
        protected override async Task OnInitializedAsync() => consumedMessage = kafaConsumeMessageClient.GetKafkaMessage();
    } @page "/kafka"
    @attribute [StreamRendering(true)]
    @attribute [OutputCache(Duration = 5)]
    @using Confluent.Kafka
    <h3>KafkaConsumer</h3>
    
    @inject KafkaConsumeMessageClient kafaConsumeMessageClient
    <PageTitle>Kafka Consumed Message</PageTitle>
    
    <h1>Kafka</h1>
    
    <p>This component demonstrates showing data loaded from a backend API service.</p>
    
    @if (consumedMessage == null)
    {
        <p><em>Loading...</em></p>
    }
    else
    {
        <table class="table">
            <thead>
                <tr>
                    <th>Topic</th>
                    <th>Value</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>@consumedMessage.Topic</td>
                    <td>@consumedMessage.Value</td>
                </tr>
    
            </tbody>
        </table>
    }
    @code {
        private ConsumeResult<string, string>? consumedMessage;
    
        protected override async Task OnInitializedAsync() => consumedMessage = kafaConsumeMessageClient.GetKafkaMessage();
    } Step 5: Configure HttpCall to the ApiService public class KafkaConsumeMessageClient(HttpClient httpClient, IConsumer<string, string> _consumer)
    {
    
        public ConsumeResult<string, string>? GetKafkaMessage(CancellationToken cancellationToken = default)
        {
            ConsumeResult<string, string>? deliveryResult = null;
            _consumer.Subscribe("messaging");
            deliveryResult = _consumer.Consume(TimeSpan.FromSeconds(10));
    
            return deliveryResult;
        }
    } public class KafkaConsumeMessageClient(HttpClient httpClient, IConsumer<string, string> _consumer)
    {
    
        public ConsumeResult<string, string>? GetKafkaMessage(CancellationToken cancellationToken = default)
        {
            ConsumeResult<string, string>? deliveryResult = null;
            _consumer.Subscribe("messaging");
            deliveryResult = _consumer.Consume(TimeSpan.FromSeconds(10));
    
            return deliveryResult;
        }
    } Kafka Produce Demo Kafka UI Demo Kafka Consume Demo Github Project: GitHub - ssukhpinder/DotnetAspireChallenge: 10 Day .Net Aspire Challenge Cheatsheet: Cheat Sheets — .Net Github Project: GitHub - ssukhpinder/DotnetAspireChallenge: 10 Day .Net Aspire Challenge GitHub - ssukhpinder/DotnetAspireChallenge: 10 Day .Net Aspire Challenge Cheatsheet: Cheat Sheets — .Net Cheat Sheets — .Net

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10 Days of .Net Aspire: Day 5 — Integrating Apache Kafka

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