Return jpeg image from Asp.Net Core WebAPI

Clean solution use FilestreamResult !!

[HttpGet]
public IActionResult Get()
{
    var image = System.IO.File.OpenRead("C:\\test\\random_image.jpeg");
    return File(image, "image/jpeg");
}

Explanation:

In ASP.NET Core you have to use the built-in File() method inside the Controller. This will allow you to manually set the content type.

Don't create and return HttpResponseMessage, like you were used to using in ASP.NET Web API 2. It doesn't do anything, not even throwing errors!!

PhysicalFile helps to return file from Asp.Net Core WebAPI with a syntax simple

    [HttpGet]
    public IActionResult Get(int imageId)
    {            
       return PhysicalFile(@"C:\test.jpg", "image/jpeg");
    }