C#•2y ago

❔ how to detect when you close the window

how can i check when you close your windows form and so i can run some code off it when it is closed

39 Replies

phaseshift•2y ago

there's a close event, no doubt Form.FormClosing

ZicklesOP•2y ago

does that only work in net 6?

phaseshift•2y ago

ZicklesOP•2y ago

well at least it is not working for me in net 7 rn it doesnt show it exists

phaseshift•2y ago

are you really using win forms? or wpf?

ZicklesOP•2y ago

ZicklesOP•2y ago

does that mean that this hasnt work since 4.8.1 or is that something different

phaseshift•2y ago

it means it works up to netfx 4.8.1, and in 'net'/'net-core' from 3.0 to current

ZicklesOP•2y ago

well that means it will not work in .net 6 or 7 right?

phaseshift•2y ago

no... it means as long as youre not earlier than net core 3, then it works on current .net platform (+ windows desktop) '5,6,7,8' from your image = .net 5 thru .net 8

ZicklesOP•2y ago

how do i check what net core i am on?

phaseshift•2y ago

Think its in the .csproj file what youre actually building for You can check whats installed with dotnet --list-sdks

ZicklesOP•2y ago

i still dont know why it is not working is the wrong template?

phaseshift•2y ago

theres a thing for this. What is it 🤔 $newproject

MODiX•2y ago

When creating a new project, prefer using .NET over .NET Framework, unless you have a very specific reason to be using .NET Framework. .NET Framework is now legacy code and only get security fix updates, it no longer gets new features and is not recommended. https://cdn.discordapp.com/attachments/569261465463160900/899381236617855016/unknown.png

phaseshift•2y ago

so yeah, you should be fine - you picked 'new' win forms app

ZicklesOP•2y ago

yea expect it does show or work only shows ActiveForm with i search for form

phaseshift•2y ago

doesnt mean much to me or what 'search' means

ZicklesOP•2y ago

i meant type

ZicklesOP•2y ago

phaseshift•2y ago

events arent* static What you're doing there doesn't make sens you need to use the instance you created, and hook up the events from that

ZicklesOP•2y ago

do you have any exmaple you know i could look at? whatever i dont really understand how this works so i will figure it out some itime i just dont know how to do this well do you think you could further explain what you mean by this?

Kouhai•2y ago

Here you're creating a new instance of Form1 and passing it to Application.Run If you want to subscribe to an event, you need to an instance of Form1 So something like var form = new Form1() form.On +=

ZicklesOP•2y ago

thank you also one more question is there a way i can open another form like the way above or is it not possible to open it again when you close it

Kouhai•2y ago

You mean opening a new one after the main form passed to Application.Run has been closed?

ZicklesOP•2y ago

yea

Kouhai•2y ago

iirc you can call Application.Run again

ZicklesOP•2y ago

that doesnt work

Kouhai•2y ago

Can you show the code for how you tested it?

ZicklesOP•2y ago

        static void Main()
        {
            ApplicationConfiguration.Initialize();
            Application.Run(new Form1());

            var form = new Form1();
            form.FormClosing += Form_FormClosing;
        }

        private static void Form_FormClosing(object? sender, FormClosingEventArgs e)
        {
            Application.Run(new Form1());
        }

        static void Main()
        {
            ApplicationConfiguration.Initialize();
            Application.Run(new Form1());

            var form = new Form1();
            form.FormClosing += Form_FormClosing;
        }

        private static void Form_FormClosing(object? sender, FormClosingEventArgs e)
        {
            Application.Run(new Form1());
        }

Kouhai•2y ago

I mean Let's step back a little bit Do you know how variables work in C#?

ZicklesOP•2y ago

yea

Kouhai•2y ago

Okay, in the snippet you have sent, can you explain this part

Application.Run(new Form1());

var form = new Form1();
form.FormClosing += Form_FormClosing;

Application.Run(new Form1());

var form = new Form1();
form.FormClosing += Form_FormClosing;

ZicklesOP•2y ago

you just want me to explain how it works?

Kouhai•2y ago

Yes, I want you to explain the call to Application.Run var form = new Form1(); I know this might seem a bit dumb on my part, but I think it's better to fully grasp these basics first 😅

ZicklesOP•2y ago

eh whater i dont feel like doing this i will deal with this some other time i mean i want to figure it out i am just too lazy to sorry

Kouhai•2y ago

Well, You'll have to learn to figure it out 😅

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ how to detect when you close the window