WinForms Form_Load not called

Question

I have a form that inherits from a base form. There is code both in the baseform_load and childform_load events.

The BaseForm looks like this:

public partial class BaseForm : Form { public BaseForm() { InitializeComponent(); } private void BaseForm_Load(object sender, EventArgs e) { //Do stuff... } }

And a child form might look like this:

public partial class ChildForm : BaseForm { public ChildForm () { InitializeComponent(); } private void ChildForm _Load(object sender, EventArgs e) { //Do stuff... } }

The baseform's load event is not explicitly loaded. The event handlers are also available because they're being created through the form designer.

I open my forms with the following method:

public static DialogResult ShowForm<T>(this Form form, bool canShowForm) where T : Form, new() { return new T().ShowDialog(form); }

Everything was working fine, but all of a sudden, neither the code in the baseform nor childform load events is being called.

Note: I'm calling InitializeComponent in my childform constructor and it doesn't raise any exception.

What is wrong here?

You need to include all the relevant information.. does the childform call the baseforms load event? There isn't really enough information here to determine the cause — Sayse
– Sayse, Commented Jan 6, 2015 at 8:19

Patrick Hofman · Accepted Answer · 2015-01-06 08:27:54Z

5

I guess the event handlers aren't subscribed (due to overriding the base class' InitializeComponents). Add this to the constructor:

this.Load += BaseForm_Load;

Pro tip: You might want to look onto overriding Form.OnLoad. If you do so, it calls the OnLoad on the derived classes automatically, so it doesn't need event subscription.

Something like:

protected override void OnLoad(EventArgs e) { base.OnLoad(e); // let the base class do it's OnLoad //Do your own stuff... }

answered Jan 6, 2015 at 8:27

Patrick Hofman

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11 Comments

Ivan-Mark Debono Over a year ago

I was using this method but it wasn't working. When I debug through code neither OnLoad method is called (BaseForm nor ChildForm)

Patrick Hofman Over a year ago

I tried your code and it does work... Are your sure the derived partial classes aren't breaking you up? I always prefer to have a non-designer base form.

Ivan-Mark Debono Over a year ago

My code was working fine till now!! What do you mean by breaking you up? Edit: It's not even working when I move the code to OnShown methods.

Patrick Hofman Over a year ago

Can you make a stripped sample? Include the designer code files too please.

Ivan-Mark Debono Over a year ago

A new project with 2 simple forms and using the above extension method works fine. Could it be obsolete code in InitializeComponent from when I changed code from Form_Load() to Onload()?

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