public virtual HttpResponseMessage GetThumbnail(long id) { var file = fileUploadService.GetFileThumbnail(id); if (file == null) { return(new HttpResponseMessage(HttpStatusCode.NotFound)); } var result = new HttpResponseMessage(HttpStatusCode.OK); string ext = Path.GetExtension(file.Name).ToLower(); if (!neadThumbnailFileExt.Contains(ext)) { if (ext == ".xls" || ext == ".xlsx") { result.Content = new ByteArrayContent(Resources.Resource.Img_Excel.ToByteArray()); } if (ext == ".doc" || ext == ".docx") { result.Content = new ByteArrayContent(Resources.Resource.Img_Word.ToByteArray()); } } else { if (file.Thumbnail != null) { result.Content = new ByteArrayContent(file.Thumbnail); } else { result.Content = new ByteArrayContent(Resources.Resource.Img_Blank.ToByteArray()); } } result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = file.Name, Size = file.Size }; result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream"); return(result); }