Create object URL for the FileContent in MVC Core 3.0

[HttpGet]
public IActionResult Get()
{
Byte[] b = System.IO.File.ReadAllBytes(@"E:\\Test.jpg");
// You can convert to string using method Convert.ToBase64String from byte array.
string result = Convert.ToBase64String(b,0,b.length);
//return File(b, "image/jpeg");
return result;
}