unhandled exception has occurred..
in [Dot Net]
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From: Allen on 6 Dec 2009 22:10 I use V C++ 2008. From the code below I am trying to make a program that will ask the user to enter a number into the text box. If the user click "Enter", without entering a number a dialog box will come up to show that unhandled exception has occurred.. I want to prevent the unhandled.. dialog box from coming up. I want to use a message box instead, to promt the user to enter a number and the program should go on. I noticed that if I iliminte all codes after the end of the catch block, only my message box will show up, but the unhandled exption dialog box would not show up. If I leave the mentioned codes in place, then the unhanled exception dialog box together wilth my message box will show up. Can anybody tells me why that is happening and what should I do to fix this problem. Thanks a lot. private: System::Void BtnIn_Click(System::Object^ sender, System::EventArgs^ e) { try { empNumBox->Text; if (empNumBox->Text == "") throw gcnew System::ArgumentException(L" You have to enter your employee code"); } catch(System::ArgumentException^ pex) { MessageBox::Show(pex->Message,L" Error "); } Int32 temp = Convert::ToInt32(empNumBox->Text); switch (temp) { case 1: { Do something } break; default: MessageBox::Show(" This is an invalid employee number.\n Please try again! ",L" Error "); } } -- Thanks Allen
From: Patrice on 7 Dec 2009 07:13 And the exception you get is raised from ? You show a message if the textbox is empty but then your code keeps running and you'll try to convert this empty textbox to an int. I believe this is where you have another exception. I wouldn't use exceptions at all. This is not that something goes wrong in the code but just that the data entered user is not valid. A VC group might be better as this is rather a code organization issue rather than a .NET Framework issue... My approach would be to validate the user input and if it is wrong to display an error message and then quit the routine letting the user to correct before proceeding again... -- Patrice "Allen" <allen_press(a)yahoo.com> a �crit dans le message de groupe de discussion : 4FACE24F-0975-4775-939F-DD93953DCD8B(a)microsoft.com... > > I use V C++ 2008. From the code below I am trying to make a program that > will ask the user to enter a number into the text box. If the user click > "Enter", without entering a number a dialog box will come up to show that > unhandled exception has occurred.. > > I want to prevent the unhandled.. dialog box from coming up. I want to > use a message box instead, to promt the user to enter a number and the > program should go on. > > I noticed that if I iliminte all codes after the end of the catch block, > only my message box will show up, but the unhandled exption dialog box > would not show up. If I leave the mentioned codes in place, then the > unhanled exception dialog box together wilth my message box will show up. > Can anybody tells me why that is happening and what should I do to fix > this problem. > > Thanks a lot. > > > private: System::Void BtnIn_Click(System::Object^ sender, > System::EventArgs^ e) > { > > try > > { > empNumBox->Text; > if (empNumBox->Text == "") > > throw gcnew System::ArgumentException(L" You have to enter your employee > code"); > > } > > catch(System::ArgumentException^ pex) > { > MessageBox::Show(pex->Message,L" Error "); > } > > > Int32 temp = Convert::ToInt32(empNumBox->Text); > switch (temp) > { > case 1: > { > Do something > } > break; > > default: MessageBox::Show(" This is an invalid employee number.\n Please > try again! ",L" Error "); > } > } > > -- > Thanks > Allen
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