Скачать или смотреть Handling URL Parameters in ASP.NET Core: Best Practices for Textbox Automation

Learn how to effectively manage URL parameters in ASP.NET Core to prevent data loss in textboxes. Explore solutions with clear examples.
---
This video is based on the question https://stackoverflow.com/q/64868847/ asked by the user 'ericso' ( https://stackoverflow.com/u/14339032/ ) and on the answer https://stackoverflow.com/a/64869778/ provided by the user 'nalnpir' ( https://stackoverflow.com/u/10513564/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: URL @ Context.Request.Query

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding URL Parameters in ASP.NET Core

When working with forms in ASP.NET Core, you may encounter a situation where you want to automate filling in textboxes with URL parameters. The primary goal is to create a seamless user experience. However, a common issue arises when certain data disappears upon form submission. In this guide, we will explore a specific problem related to URL parameters and provide effective strategies for managing them within your application.

The Problem

Imagine you're building a user registration form where you want to automatically populate the Name and ID fields from the URL. You might set your form's input values directly from the query string like this:

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

However, you notice that when users leave the checkbox IsAccepted unchecked and submit the form, the values in the textboxes Name and ID disappear, leaving users frustrated. This certainly isn't the experience you want for your users!

The Solution

To address this issue, we need to update our controller logic and modify how we manage the data filled in by the user. Here's how to do it:

Option 1: Using a ViewModel

Update your GET method to accept parameters:

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

Modify your View to use the model:
Instead of using the query string directly, you can access the model properties:

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

This way, even if the IsAccepted checkbox isn't checked, the data in Name and ID remains intact upon submission because it's bound to the model.

Option 2: Using ViewBag

Modify your GET method to utilize ViewBag:

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

Update your View to pull from ViewBag:

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

Using ViewBag can be a quick solution, though it’s typically more advantageous to use a strongly-typed ViewModel for maintaining data integrity.

Conclusion

Managing URL parameters strategically can greatly enhance your user experience. By leveraging a ViewModel or using the ViewBag appropriately, you can prevent data loss during form submissions, ensuring that your users retain the information they're inputting.

Feel free to experiment with both solutions to find out which one best fits your application’s architecture and meets your needs. Remember, clear management of UI data leads to better user satisfaction!

So don’t let those textboxes run empty on submission; keep your data persistent!