Скачать или смотреть How to Run Multiple Tasks Simultaneously in the Background of an IHostedService in ASP.NET Core

Learn how to effectively run multiple tasks simultaneously using the `IHostedService` in your ASP.NET Core applications. This guide provides a clear solution to avoid blocking issues between tasks.
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Running Multiple Tasks Simultaneously in ASP.NET Core IHostedService

In today’s fast-paced web application environment, implementing concurrent processing is essential for efficiency and responsiveness. However, when you're using the IHostedService in ASP.NET Core, you might encounter issues when trying to run multiple tasks simultaneously.

The Problem: Blocking Tasks in IHostedService

Let's say you have an ASP.NET Core application that utilizes an IHostedService to run background tasks. In your scenario, you have two distinct tasks:

Task1: Establishes a WebSocket connection to continuously receive data and stores that data in a Microsoft SQL Server database using Entity Framework Core.

Task2: Runs an endless loop every 10 seconds to process transactions added to that database by Task1.

The challenge arises when Task1 blocks Task2 from executing, leading to inefficiencies and potential data processing delays.

The Solution: Running Tasks Simultaneously

To resolve this issue and allow both tasks to run smoothly without blocking each other, you can follow these steps:

Step 1: Modify the StartAsync Method

Initially, you might have a StartAsync method that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

This code waits for Task1 to complete before starting Task2, which makes Task2 dependent on Task1 finishing – this is where your blocking issue comes from. Instead, modify your method to run both tasks independently:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Ensure Task2 Uses a Cancellation Token

Creating a cancellation token ensures you can gracefully handle the stopping of the long-running task. Modify Task2 to accept a cancellation token as follows:

[[See Video to Reveal this Text or Code Snippet]]

Additional Notes:

Use Async/Await: It’s crucial to utilize async and await properly to prevent blocking the main thread and allow your application to be responsive.

Task.Run: This method is useful for running background tasks that don’t need to return a value.

Graceful Cancellation: Implementing cancellation tokens helps keep your application clean and can prevent resource leaks.

Conclusion

By implementing these changes, you enable your ASP.NET Core application to run multiple background tasks concurrently without the cumbersome blocking issues. Utilizing the IHostedService effectively allows for improved data handling capabilities, ensuring your application remains efficient in processing tasks that require continuous and concurrent operations.

By following this guide, you can enhance your application's performance while also making your codebase cleaner and more maintainable. Don’t hesitate to explore further optimizations in your background processing strategies. Happy coding!