Getting Form Refrence

Question

How can i know which forms are currently open in the application. In case of MDI form, we can loop through its children forms, but what if the form is not a chid of mdi main and we want to see if it is open or not. If it is open, then how to get its refrence. Thanks in advance, Regards

prathameshk · Answer

-- Create a static class known as FormController. -- Keep a collection (say Hashtable myForms) in it -- Write following methods Public Static Form GetInstanceIfFormOpen(String formKey) { // If formKey exists in Hashtable return appropriate instance, else return null } Public Static void PutForm (String formKey, Form f) { // Put instance f under key formKey in the Hashtable } Public Static void RemoveForm (String formKey) { // Remove instance under formKey from the Hashtable } -- To see if a form is open call GetInstanceIfFormOpen(formKey) and you can do whatever you wnat with the instance :-) -- In the constructor of each form call PutForm(formKey, this) to put the form in the Hashtable -- While closing the form call RemoveForm(formKey) to remove from the Hashtable -- I suggest maintain a list of all formKeys you plan to use as public constants in the FormController class itself

fixme · Answer

Have your mainform contain the child form as a data member. if(childform != null && childform.Created)//check to see if it is still alive { //do something cool with it here }

Getting Form Refrence

Answers (2)