Calling function in one form from another

Question

I have a program where Form1 is a MDI parent to form 2. In the menu on Form1 I have an option which creates a dialog (Form3) for the user to enter information and save that information to a file. When the user clicks the button on Form3 to save the information I would like to be able to do one of two things. Add this information to a List on Form2 or call a function on Form2 to reload all the data from a file. I have not been able to figure out how to do either. Another option I have considered but do not know how to do is create an event handler which would fire when Form2 regains focus I have not found an event which I feels works for this but I am guessing I have just missed it. This option is behind the other options as I would reload the data more often than should really be required but would work if the above will not.

oupoi · Answer

There are many ways to do. The simplest one is pass the object instance of Form2 to Form3 through Form1. e.g. /*******Form1.cs********/ //Create Form2 Form2 f2 = new Form2(); f2.MdiParent = this; f2.Show(); //Create Form3 Form3 f3 = new Form3(); f3.formToCallback = f2; //formToCallback  should be a public variable of Form2 type in Form3 f3.ShowDialog(this); /*******Form3.cs********/ formToCallback.myFunc(); //myFunc should be the public function in Form2 that you are willing to call

Russ · Answer

That was one of my guesses too. Unfortunitly it did not work out.

jc mandapat · Answer

I think when you want to call a function in form2 you just have to call first the form and then call the function. EX: Form2.RetrieveFile() hope this helps