How to Effectively Store IProgress Results in ASP.NET Core MVC

Описание: Learn how to implement a reliable method for tracking and storing async task progress in your ASP.NET Core MVC applications using MemoryCache.
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How to Effectively Store IProgress Results in ASP.NET Core MVC

In modern web applications, real-time feedback is crucial, especially for long-running tasks like file uploads. If you're working with ASP.NET Core MVC and need to implement a progress bar to track asynchronous tasks, you might face challenges in managing and storing progress updates efficiently. In this guide, we’ll explore a common scenario—updating users on the progress of file uploads—and discover an effective way to achieve this using IProgress and MemoryCache.

The Problem: Tracking Upload Progress

Imagine you’re developing a feature in your application that allows users to upload files to a cloud storage service. While this process is occurring, users often expect to see some indication of the upload progress. Your initial attempt involved storing this progress within a session variable, but you found this method to be both ineffective and not recommended.

Below is a simplified version of your upload service method:

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Despite this setup, the progress wasn’t being recorded as expected. So, what’s the solution?

The Solution: Leveraging MemoryCache

After experimenting with various approaches, we discovered that using MemoryCache provides a more reliable and efficient method for storing progress updates. This technique is less dependent on the user's current session state and provides better accessibility during ongoing uploads.

Here’s how you can revise the service method to use MemoryCache:

Revised Upload Method

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Explanation of Changes

Using MemoryCache: The cache.Set method allows you to store the bytes transferred progress seamlessly, making the updates available beyond the session scope. This is particularly useful for long-running tasks where users may navigate away from the uploading page.

Thread Safety: MemoryCache is designed to be thread-safe, meaning multiple concurrent uploads can be tracked without issues.

Implementing the Progress Retrieval

After the upload completes or during a separate action, you can retrieve the progress value simply:

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Conclusion

By switching from using session variables to MemoryCache, you can effectively manage progress tracking for asynchronous tasks like file uploads in your ASP.NET Core MVC applications. This change not only enhances the reliability of progress reporting but also improves the overall user experience by maintaining progress visibility even when users navigate away from the uploading interface.

Implementing these techniques will allow you to create a more polished and responsive application that users will appreciate. With real-time feedback through a functional progress bar, you can ensure that users remain engaged during long uploads—worthy improvements in today’s fast-paced digital environment.