How to get bytes from IFormFile in .net?

 To get bytes from an IFormFile in .NET, you can use the OpenReadStream() method to read the contents of the file into a MemoryStream object, and then use the ToArray() method of the MemoryStream to get the bytes. Here's an example:

csharp
[HttpPost]
public async Task<IActionResult> Upload(IFormFile file)
{
    if (file != null && file.Length > 0)
    {
        using (var stream = new MemoryStream())
        {
            await file.CopyToAsync(stream);
            byte[] bytes = stream.ToArray();

            // Use the bytes here
        }
    }
    
    // ...
}

In this example, we first check if the file is not null and has a length greater than 0. If so, we create a MemoryStream object and copy the contents of the file to the stream using the CopyToAsync() method. We then use the ToArray() method of the stream to get the bytes as a byte array.

You can then use the bytes variable to process the contents of the file as needed. Note that this example uses an asynchronous method (CopyToAsync()) to avoid blocking the thread while the file is being read.