System windows forms control validating

21-Apr-2016 06:09 by sirhonda 7 Comments

System windows forms control validating - Online sex

You might even loop through all the controls on your form and focus each of them individually (or an individual control by giving it focus then changing the focus to another control), achieving the same effect: Which solution is better?

system windows forms control validating-42system windows forms control validating-51

I am trying to better understand how validation works in a Windows Forms application. As you can see in the example, Validate Children is called as a result of the Click event causing the Validating event to be sent to each of the controls. OK; Close(); } } void Text Box_Validating( object sender, Cancel Event Args e ) { m_Error Provider. The app also uses an Error Provider control to give the user feedback. Click += new Event Handler( Btn Ok_Click ); m_Ok Btn. Clear(); Text Box text Box = sender as Text Box; // m_Text Box1 is always valid, the others are valid if they have text. Yesterday, I did not understand how to use the Ok button Click event to perform this validation. Clicking the Ok button causes the Error Provider to do it's thing where a control is not valid and the dialog is not closing unexpectedly. Beep(); } } public class Dialog : Form { Text Box m_Text Box0; Text Box m_Text Box1; // not validated Text Box m_Text Box2; Button m_Ok Btn; Button m_Cancel Btn; Error Provider m_Error Provider; public Dialog() { m_Text Box0 = Create Text Box( 0, "Text Box 0" ); m_Text Box1 = Create Text Box( 1, "Text Box 1" ); m_Text Box2 = Create Text Box( 2, "Text Box 2" ); m_Ok Btn = Create Button( 3, "Ok" ); m_Cancel Btn = Create Button( 4, "Cancel" ); m_Error Provider = new Error Provider( this ); //m_Btn Ok. As a follow up to my previous post about enhancing the validation controls within Windows Forms, there might be times when you would like to manually invoke the “Validating” event of a control.For example, you might want to have a routine that fires on the form's “Closing” event or a data save method to loop through all the controls on your form and validate them independently to ensure that all controls are valid.

This might be a common scenario in data entry forms where you might create a new record and the user might not touch all the fields on your form (and thus never trigger the “Validating” event of your controls). One, pointed out by Chris Sells (read more), invokes the Control's “Notify Validating” event through Reflection.

Here is an example: You can also trigger the Validation event by giving focus to a control and taking the focus away.

The internets are full of trivial examples, but I couldn't find a single non-trivial example explaining control validation.

Anyway, thanks to Sw Dev Man81 and Hans Passant I am starting from a much better place than yesterday.

The "real application" has a dialog with many Text Box controls.

Each of the controls implements the Validating event. Causes Validation = false; } void Btn Ok_Click( object sender, Event Args e ) { if( Validate Children() ) { Dialog Result = Dialog Result.

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