Wait until form is finished loading

Question

Is there some sort of boolean that I can use to check whether the instance of a form is loaded, or otherwise wait until the form is loaded?

for example:

While(form_loaded == false) { Try { //do something } catch { }//do try catch so code won't barf }

I keep getting the following exception:

A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll

An unhandled exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll

Additional information: Invoke or BeginInvoke cannot be called on a control until the window handle has been created.

This is what I am worrying about.

Additionally if a more detailed explanation is needed I can try to post some code and/or some more output debugging information.

Your code will not compile against any C# compiler (I know it's example/pseudo-code, but that's beside the point.) — Grant Thomas
– Grant Thomas, Commented Sep 7, 2013 at 17:06
You need to do this the other way around. Don't start the thread until the form's Load event fires. — Hans Passant
– Hans Passant, Commented Sep 7, 2013 at 18:54

BRAHIM Kamel · Accepted Answer · 2013-09-07 17:09:28Z

try to use the shown event something like this

 public partial class Form1 : Form { public Form1() { InitializeComponent(); this.Shown += new System.EventHandler(this.Form1_Shown); } private void Form1_Shown(object sender, EventArgs e) { } }

hope this help

In general, the event should be subscribed to/delegated in the designer.

Avi Turner · Accepted Answer · 2016-01-13 03:43:03Z

The first event that is triggered after form is fully loaded is the Shown event. use it...

According to MSDN the event sequence is :

When application starts:

Control.HandleCreated
Control.BindingContextChanged
Form.Load
Control.VisibleChanged
Form.Activated
Form.Shown

When an application closes:

Form.Closing
Form.FormClosing
Form.Closed
Form.FormClosed
Form.Deactivate

And as @Henk Holterman stated in his answer, don't use busy waiting in an event driven form...

Henk Holterman · Accepted Answer · 2013-09-07 20:55:07Z

6

You have a Loaded and a Shown event to pick from.

Windows is event driven so never wait for something in a loop.

edited Sep 7, 2013 at 20:55

answered Sep 7, 2013 at 17:05

Henk Holterman

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