update:请求加密&防篡改

QRCodeService/Application/Queries/LinkQueries.cs

@@ -26,7 +26,7 @@ namespace QRCodeService.Application.Queries
                 connection.Open();
                 var link = await connection.QueryAsync<Link>(
                     @"SELECT ShortCode,FullUrl FROM Link WHERE ShortCode = @shortCode",new {shortCode });
-                return link.Single();
+                return link.SingleOrDefault();
             }
         }
     }