Скачать или смотреть How to Hit a HttpPost-action with Parameters in ASP.NET Core

A guide that explains how to correctly pass parameters in an API endpoint with `HttpPost` in ASP.NET Core, ensuring you handle the data properly.
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This video is based on the question https://stackoverflow.com/q/68106081/ asked by the user 'user1531040' ( https://stackoverflow.com/u/1531040/ ) and on the answer https://stackoverflow.com/a/68107007/ provided by the user 'Nemanja Todorovic' ( https://stackoverflow.com/u/4546511/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Hit a HttpPost-action with Parameters in ASP.NET Core

When working with APIs in ASP.NET Core, particularly when using the HttpPost method, you may encounter scenarios where you want to pass parameters through your API endpoint. This guide will address a common problem: invoking a HttpPost action with a parameter and ensuring that it works as intended. We will also provide a clear solution to the issue at hand. Let’s delve into the details!

The Problem

You have an API set up with an endpoint defined using the HttpPost attribute, like so:

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

The issue arises when attempting to call this action. You can successfully invoke the method like this:

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

However, if you try to add a parameter to your request URL:

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

The action does not get invoked as expected. This can be frustrating, but it can be resolved. Let’s walk through the solution.

The Solution

To ensure that your API can correctly process the incoming parameter along with the body data, you need to adjust your endpoint definition. Specifically, you should modify how the id parameter is received. Here's how to do it:

Step 1: Change Your Endpoint Definition

Update the method signature of your API endpoint to use the [FromQuery] attribute for the id parameter. This will allow the API to read the id directly from the query string in the URL.

Here's the updated endpoint:

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

Step 2: Ensure You Are Passing a Valid GUID

While you are constructing your HTTP request, make sure that the id you are passing in the query string is a valid GUID. If the value of id does not adhere to the GUID format, the API will fail to route to the correct action, potentially causing an error.

Summary

Modify the Method Signature: Use [FromQuery] for the id parameter to read from the URL.

Check Your GUID: Ensure that the GUID you pass is valid to avoid routing issues.

Conclusion

By adjusting how you capture parameters in your ASP.NET Core API, you can effectively hit your HttpPost actions with parameters. This not only makes your API more flexible but also reduces the chances of errors related to parameter passing. Now you can confidently make calls to your API and ensure they process correctly! If you have further questions or run into other issues, feel free to reach out or leave a comment below.