完善功能

电子展板/Controller/BaseController.cs

@@ -159,6 +159,7 @@ namespace 电子展板.Controller
             }
             ActionResult response = new ActionResult(HttpStatusCode.OK);
             response.Content = new ByteArrayContent(bytes);
+            response.Content.Headers.ContentEncoding.Add("utf-8");
             response.Content.Headers.ContentType = new MediaTypeHeaderValue(contentType);
             response.Content.Headers.ContentLength = bytes.Length;
             return response;