添加查询错误

TEST_Prj/Test/Test/Form1.cs

@@ -632,9 +632,12 @@ namespace Test
                     {
                         Console.WriteLine(findStr);
                         finddata = GetProductType("序列号", findStr);//数据库中查询
-                        if(finddata!="")
+                        if (finddata != "")
                         {
-                            SendMsgdata("server_send:"+finddata);
+                            SendMsgdata("server_send:" + finddata);
+                        }
+                        else {
+                            SendMsgdata("server_send:" + "error\r\n");
                         }
                         if (start_cnt)
                         {