Apply changes to mainforms Form.Icon at runtime

Question

I have a System.Windows.Forms.Form and want to change the Form.Icon at runtime to display a status. I've managed to load the icon from the projects ressources:

Type type = this.GetType();
System.Resources.ResourceManager resources =
    new System.Resources.ResourceManager(type.Namespace + ".Properties.Resources", this.GetType().Assembly);
this.Icon = (System.Drawing.Icon)resources.GetObject(
    type.Namespace + ".Icons." + statusText + ".ico");

But the displayed icon stays the same (design time icon) all the time. Do I have to call a method to tell the Form to apply changes? Something wrong about my usage of Form.Icon?

Answer 1

It is unclear to me why you are doing this the hard way. Just add the icon to your resources. Project + Properties, Resource tab, arrow on Add Resource button, Add Existing File. Then you'd use it like this at runtime:

    private void button1_Click(object sender, EventArgs e) {
        this.Icon = Properties.Resources.Mumble;
    }

Where Mumble is the name of the icon.

If you are 100% sure that GetObject() doesn't return null then try setting the Icon property in the designer. If it still doesn't show up then there's something wrong with the icon format. Make sure that it doesn't have too many colors, 256 works on XP.