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Learn the right way to add query parameters to Razor Pages links and improve your web application functionality effortlessly.
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This video is based on the question https://stackoverflow.com/q/63751289/ asked by the user 'user1238784' ( https://stackoverflow.com/u/1238784/ ) and on the answer https://stackoverflow.com/a/63751339/ provided by the user 'Tony Pacheco' ( https://stackoverflow.com/u/13343901/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Razor Pages: How to Pass Query Parameters in a Link

Introduction

When developing web applications using Razor Pages, you may occasionally find yourself needing to pass query parameters through links. This is essential for dynamic content generation but can sometimes be tricky. If you've experienced an issue where no query parameters were added to the address, leaving you with an empty Request.Query, you’re in the right place. In this guide, we'll guide you through the correct approach to passing query parameters in Razor Pages links, ensuring your application runs smoothly and efficiently.

Understanding the Problem

In the initial attempt to create links with query parameters, the code looked like this:

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

While this seems like a straightforward approach, clicking the links did not add the expected query parameters to the URL, resulting in an empty Request.Query on the server-side. The goal here is to figure out what went wrong and how to correct it.

The Solution

To achieve a successful implementation of query parameters in Razor Pages links, follow the steps outlined below.

1. Use asp-route- Tag Helpers

Instead of hardcoding the query parameters in the href, make effective use of Razor's Tag Helpers, specifically the asp-route- attribute. Here's how to implement it correctly:

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

This method automatically adds the correct query parameter format to the URL.

It improves readability and maintainability over hardcoded queries.

2. Simplifying Parameter Handling in Your OnGet Method

Instead of parsing query parameters manually from Request.Query, you can simplify your code by adjusting your OnGet method’s signature. Here's what this might look like:

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

By specifying int catId as a parameter, Razor automatically binds the query parameter from the URL.

This approach reduces boilerplate code and makes your logic cleaner and easier to understand.

Conclusion

In web development with Razor Pages, effectively passing query parameters can significantly enhance your application's dynamic capabilities. By using the asp-route- Tag Helper for link creation and simplifying your OnGet method’s parameter handling, you can ensure your application functions as intended.

Implementing these practices not only improves code readability but also enhances maintainability. Start applying these techniques to your Razor Pages today, and you’ll notice the difference in functionality!