c# - RadioButtons and Throwing Exception -


i have 2 radio buttons user select type of movie like. example program, want understand throwing exceptions better. when user clicks display button shows type of movie selected, between action or comedy. if no selection made throws exception, best way figure out, going in right direction?

 string selection;         try         {             if (radaction.checked)             {                 selection = radaction.text;             }             else                 if (radcomedy.checked)                 {                     selection = radcomedy.text;                 }                  else                     throw new argumentnullexception("please choose movie type");             messagebox.show(selection);         }          catch(argumentnullexception msg)         {             messagebox.show(msg.message);         }

it's not @ practice show error message in scenario. using try...catch , throw...exception comes performance penalty. try avoid as possible. refer so post further reference.

but if stick try...catch create own user-defined exception.

 public class movieselectionnotfoundexception : exception  {      public movieselectionnotfoundexception()      {      }       public movieselectionnotfoundexception(string message)          : base(message)      {      }       public movieselectionnotfoundexception(string message, exception inner)          : base(message, inner)      {      }  }

and can use in code follows:

string selection = string.empty; try {     if (radaction.checked)     {         selection = radaction.text;     }     else if (radcomedy.checked)     {         selection = radcomedy.text;     }      else         throw new movieselectionnotfoundexception("please choose movie type");      messagebox.show(selection); }  catch (movieselectionnotfoundexception msg) {     messagebox.show(msg.message); }

Comments

Post a Comment

Popular posts from this blog

Socket.connect doesn't throw exception in Android -

if put nonsense url no exception thrown , none of rest of code executed not rest of asynctask called method connects. try { socketcliente.connect(new inetsocketaddress("f", port), 2000); } catch (unknownhostexception e) { geterror("host doesn't exist"); return -1; } catch (ioexception e) { geterror("could not connect: host down"); return -1; } add catch statement. catch ( exception e ) { log.d(tag, e.getmessage(),e); toast.maketext(getapplicationcontext(), "unexpected error:" + e.getmessage(), toast.length_long).show(); } this write log , pop toast tell what's going on.
Read more

SPSS keyboard combination alters encoding -

my question not have programming practical issue on spss. accident keyword combination cannot remember because did not intend press changed encoding in spss , text in data in different language english shown small boxes. nevertheless, when kind of analysis performed different language text shown in output. does know reason? tried change encoding did not produce result. first, @ edit > options , see whether setting unicode or locale. might fix it. if have text in multiple languages, want unicode. otherwise, may have specific locale set wrong. can change set locale, need know locale want use.
Read more

iphone - How do I keep MDScrollView from truncating my row headers and making my cells look bad? -

Image
here's screenshot show describing: and relevant code: - (nsinteger)spreadview:(mdspreadview *)aspreadview numberofcolumnsinsection:(nsinteger)section{ return self.viewmodel.matrix.width - 1; } - (nsinteger)spreadview:(mdspreadview *)aspreadview numberofrowsinsection:(nsinteger)section{ return self.viewmodel.matrix.height - 1; } -(mdspreadviewcell *)spreadview:(mdspreadview *)aspreadview cellforrowatindexpath:(mdindexpath *)rowpath forcolumnatindexpath:(mdindexpath *)columnpath{ mdspreadviewcell *cell = [aspreadview dequeuereusablecellwithidentifier:@"infocell"]; if (cell == nil){ cell = [[[mdspreadviewcell alloc] initwithstyle:mdspreadviewcellstyledefault reuseidentifier:@"infocell"] autorelease]; } cell.textlabel.text = ((dtvendor *)self.vendors[rowpath.row]).name; return cell; } -(cgfloat)spreadview:(mdspreadview *)aspreadview heightforrowheaderinsection:(nsinteger)rowsection{ return 200; } -(cgfloat)spreadview:(mdspreadview...
Read more