CODEWITHSUNDEEP
c#formswinforms
Michael Haddad
Michael Haddad

Reputation: 4435

When is a form displayed?

I am trying to figure out when exactly the Form.Load event occurs. In MSDN it sais:

Occurs before a form is displayed for the first time.

But when the form is displayed for the first time? My first instinct was immediately after InitializeComponent(), but when I tried the following code, the MessageBox showed 5 even though the value was set after InitializeComponent(), so it's not immediately after InitializeComponent():

public partial class Form1 : Form
{
    private int number;

    public Form1()
    {
        InitializeComponent();

        number = 5;
    }

    public void Form_Load(object sender, EventArgs e)
    {
        MessageBox.Show(number);
    }
}

So When does it occurs?

Upvotes: 4

Views: 87

Answers (2)

BugFinder
BugFinder

Reputation: 17858

Have a read of https://msdn.microsoft.com/en-us/library/86faxx0d(v=vs.110).aspx

This explains the order of startup and shutdown of forms.

In short, a number of events are triggered in order - eg create...load...activate..shown ..

Upvotes: 2

Patrick Hofman
Patrick Hofman

Reputation: 156898

OnLoad is one of the methods being called when you call Show or ShowDialog on a Form.

The first time you call Show or ShowDialog, OnLoad is called and your Load event is fired. (Just like OnHandleCreated, etc.)

Upvotes: 5

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