When you are programming a Windows Forms application, you will invariably need to get variables from a second form window, such as an options form or popup search prompt. Kad esat programmu Windows Forms pieteikumu, jums vienmēr nepieciešams, lai saņemtu mainīgos lielumus no otrās formas logu, piemēram, iespējas formu vai popup meklēšana prompt.

Most of the guides out there will tell you that you have to open the second form with ShowDialog(), which blocks the user from doing anything else until they've closed the second form window. Lielākā daļa, kas tur gidi teiks, ka Jums ir atvērt otru veidlapu ar ShowDialog (), kas bloķē lietotājam darīt jebko, kamēr viņi ir slēgts otru veidlapu logu. This won't work very well for a find/replace dialog, for instance. Tas nedarbosies ļoti labi atrast / Replace Dialog, piemēram. It also won't work very well for custom drawn popup forms. Tas nestrādās arī ļoti labi pasūtījuma izstrādāts popup veidā.

The quick way to pass variables between the forms is using Delegates. Ātrs veids, lai nodotu mainīgos starp formām izmanto delegātiem. You can set an eventhandler for the Closing event of the second form, and handle the event in the first form. Jūs varat uzstādīt eventhandler par noslēguma pasākumā otrais formu un rokturi notikums pirmajā formā. This allows you to capture variables before the second form window has closed. Tas ļauj jums uztveršanas mainīgos pirms otrā veidā logs ir aizvērts.

For this exercise, we're going to assume that we have two forms: Attiecībā uz šo uzdevumu, mēs spēsim pieņemt, ka mums ir divas formas:

MainForm MainForm

OptionsForm OptionsForm

We're going to further assume that we've clicked some sort of button that opens the OptionsForm with a Show() method call. Mēs ejam tālāk pieņemam, ka mums esat noklikšķinājis uz kaut kādas pogas, kas atver OptionsForm ar Šovs () metodes izsaukuma. Now let's take a look at the magic: Tagad pieņemsim ņemt pie burvju meklēt:

……. ... .... snip……. drēbnieks ... ....

OptionsForm theform = new OptionsForm(); OptionsForm theform = new OptionsForm ();
theform.Closing += new CancelEventHandler(theform_Closing); theform.Closing + = new CancelEventHandler (theform_Closing);
theform.Show(); theform.Show ();

} )

private void theform_Closing(object sender, CancelEventArgs e) privātā spēkā theform_Closing (objekts sūtītājs, CancelEventArgs e)
{ (

OptionsForm theform = (OptionsForm)sender; OptionsForm theform = (OptionsForm) sūtītāja;

  // Grab the variable from the options form. / / Grab mainīgo no iespējām formu. The options form should set this variable before it closes, and the variable should be marked as public. Iespējas forma jānosaka šo mainīgo pirms to aizver, un mainīgā jāmarķē kā valsts.
string localvar = theform.thestringvariable; string localvar = theform.thestringvariable;

} )

That's all there is to it. Tas viss notiek ar to.