Код: Выделить всё
string fullName = dt.Rows[0]["FileName"].ToString();
string directoryPath = MyFileMultipartFormDataStreamProvider.GetMyFileDirectory();
var myFilePath = Path.Combine(directoryPath, fullName);
using (FileStream fileStream = new FileStream(myFilePath, FileMode.Open))
{
using (var memoryStream = new MemoryStream())
{
fileStream.CopyTo(memoryStream);
HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
result.Content = new ByteArrayContent(memoryStream.ToArray());
result.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png");
return result;
}
}
Почтальон в порядке:

Подробнее здесь: https://stackoverflow.com/questions/646 ... ontenttype