Asp.net WebApi下载文件

1，图片

var result = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new ByteArrayContent(stream)
};
result.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");

2，文件

HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
response.Content = new StreamContent(stream);
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = "Wep Api Demo File.zip"
};