CODEWITHSUNDEEP
c#winforms
Bennett Yeo
Bennett Yeo

Reputation: 829

Wait until form is finished loading

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.

Upvotes: 8

Views: 43096

Answers (3)

Avi Turner
Avi Turner

Reputation: 10456

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...

Upvotes: 10

Henk Holterman
Henk Holterman

Reputation: 273854

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

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

Upvotes: 6

BRAHIM Kamel
BRAHIM Kamel

Reputation: 13794

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

Upvotes: 26

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