Asp.Net Core File Upload via Ajax: How to Successfully Upload Files to Your Database

Learn how to utilize `Ajax` for file uploads in `Asp.Net Core` applications, ensuring efficient communication with your backend and seamless file storage in your database.
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This video is based on the question https://stackoverflow.com/q/66431766/ asked by the user 'Aram' ( https://stackoverflow.com/u/11205606/ ) and on the answer https://stackoverflow.com/a/66433186/ provided by the user 'mj1313' ( https://stackoverflow.com/u/11965297/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Uploading Files to Database with Ajax in Asp.Net Core

Uploading files via a web application can be challenging, especially when working with asynchronous JavaScript and XML (Ajax). If you've tried uploading files using Ajax in your Asp.Net Core application and faced issues such as zero results being returned, you're in the right place! Let's dive into understanding how to effectively upload files to your database with Ajax in Asp.Net Core.

The Problem

You may have implemented a file upload functionality in your Asp.Net Core backend which works perfectly without Ajax. However, when trying to submit the form with Ajax, you're unable to retrieve the uploaded files as expected. Instead, you're left with a frustrating result of zero returned files.

Code Overview

Your current setup includes:

An HTML form with a Kendo Upload widget.

An Ajax call that sends the file data to your backend controller.

A controller action to handle the file upload.

Here are the key components of your code:

HTML Form

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

Ajax Call

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

Controller Action

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

Why It Fails

The issue arises because the Ajax call does not properly send the file data in a format that the controller is expecting. The parameter name in the filedata.append() method does not match the parameter name in the controller action.

The Solution

To resolve this issue, whenever files are appended to FormData, you need to ensure the correct naming convention aligns with your controller's expected parameters.

Steps to Take

Update the Ajax Call:
Change the lines in the Ajax call where you append files to included the correct parameter name (filedata):

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

Modify Your Controller:
Ensure your controller's action method aligns with the name used in your Ajax call:

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

By following these steps, your Ajax file upload should communicate correctly with your Asp.Net Core backend and successfully store files in the database!

Conclusion

Debugging file uploads with Ajax in Asp.Net Core may seem daunting, yet by ensuring the parameter names match and correctly utilizing the rawFile property, you can achieve smooth functionality.

Now you can confidently expand your application’s capabilities with seamless file uploads that enhance user experience.

Recap of Key Points

Always ensure parameter names in your Ajax calls match those in your controller.

Utilize the rawFile property to get actual file data.

Take advantage of FormData for sending files through Ajax.

Next Steps

Try implementing the corrections mentioned above in your existing code. Feel free to reach out if you encounter any more challenges or have additional questions about file uploads with Ajax in Asp.Net Core. Happy coding!

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