Скачать или смотреть How to Make Your ASP.NET MVC Form Submit Correctly with Parameters

Learn how to troubleshoot and fix issues with your ASP.NET MVC forms not passing parameters to the controller effectively. Discover tips and corrections to get it working.
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This video is based on the question https://stackoverflow.com/q/72087443/ asked by the user 'TechGeek' ( https://stackoverflow.com/u/18972846/ ) and on the answer https://stackoverflow.com/a/72110019/ provided by the user 'Rena' ( https://stackoverflow.com/u/11398810/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: Form Submission Issues in ASP.NET MVC

If you've ever found yourself puzzled as to why your form is not passing parameters to your ASP.NET MVC controller, you're not alone. Many developers encounter this frustrating issue when trying to submit user data through forms. In this guide, we will explore the common reasons why this might happen and how to fix it, ensuring that your form submissions are handled correctly. Let's dive in!

The Core Issue

In your case, you are trying to collect user inputs from a form to store them in a database using your MVC controller, but the values aren't reaching the controller method as expected. Here are some key aspects to keep in mind:

Mixing MVC and Razor Pages: One significant issue arises when you mix ASP.NET Core MVC with Razor Pages. A mismatch can lead to confusion.

Incorrectly Specified Controller Name: The way you define your form handler can impact whether the data is passed correctly.

How to Solve the Form Parameter Passing Issue

Step 1: Understand Your Framework Components

Identify the Differences: Ensure you're clear about the differences between MVC and Razor Pages:

MVC: Utilizes controllers to handle incoming requests and return views.

Razor Pages: Represents a page-centric approach with a contextual model.

Step 2: Adjust the Form Declaration

You have a form declaration that looks like this:

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

Solution: Change CarController to just Car. Your adjusted code should look like this:

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

This is crucial because the ASP.NET routing expects the controller name without the "Controller" suffix.

Step 3: Remove Unnecessary Attributes

When using Html.BeginForm, it automatically generates the required HTML form attributes, so an additional asp-action attribute is unnecessary. Your form will look like this without it:

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

Step 4: Update Your Razor Page

Implement the changes discussed above in your index.cshtml view:

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

Step 5: Ensure Proper Routing in Startup.cs

Make sure to configure your MVC routing properly in your Startup.cs:

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

Final Thoughts

By understanding the differences between ASP.NET MVC and Razor Pages, correcting your form action, and ensuring that your routing is set up correctly, you can resolve the issue of forms not passing parameters to your controller. With these steps, you'll be able to get your form submissions working seamlessly, allowing you to collect and manipulate user inputs effectively.

Feel free to share your experiences or ask questions in the comments below!