Скачать или смотреть How to Successfully Return a File in .NET Core with React and Display It in a New Browser Tab

Discover how to return a file from your .NET Core controller and display it in a new browser tab using React. Avoid common pitfalls and implement the correct solution with ease.
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How to Successfully Return a File in .NET Core with React and Display It in a New Browser Tab

When developing web applications that involve document retrieval, one common challenge arises: How can we return a file from a .NET Core backend and display it in a new browser tab using React? This question is especially relevant for developers who are integrating React with ASP.NET Core 3.1, and it can become tricky when errors appear, such as the Unsupported media type error (415).

This guide will guide you step-by-step through resolving this issue and successfully displaying files in a new tab.

Understanding the Problem

The initial attempt at solving the problem involved making an HTTP request to retrieve the document and opening it in a new browser tab:

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

However, this approach seems to trigger an error since the request doesn't reach the controller, indicating issues in the document warehouse API.

Key Errors Identified

Unsupported Media Type (Error 415): This suggests a mismatch between what the server expects and what the client sends.

Request Issues: The request never reaches the controller, meaning there is a misconfiguration in how the request is structured or sent.

Getting It Right

Despite facing these challenges, it turns out that the solution is simpler than it appears. Below is a breakdown of how to correctly retrieve and display a file:

Step 1: Correct Controller Method

You need to ensure that your controller method is correctly set up to return a file. Here’s an example of how the ViewDocument method should look:

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

Step 2: Use the Right Fetch Implementation

Instead of trying to use fetch to return the file and open it:

Directly navigate to the controller URL:

Use window.open as shown:

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

Additional Notes

If you modify the controller to return different content types, ensure your Accept headers in your fetch requests align with these changes.

The original issue that appeared as a barrier was due to an API error from the document warehouse that didn't get logged in the browser, hence returning an error at the client side.

Conclusion

Successfully returning a file from your .NET Core controller and displaying it in a new browser tab using React is entirely achievable with the right configurations in place. Remember to check both your frontend logic for calling the endpoint and your backend logic for serving the file.

Implement these solutions, and soon you'll have the capability to manage file retrieval seamlessly in your applications. If you continue experiencing issues, revisit each section, ensuring no configuration is overlooked.



With this approach, you can confidently retrieve and display documents in any web application you’re developing with .NET Core and React.