Question

How can I notify an outside “source” of the changes I make using a delegate.

Basically I have a form, I fill in that form and click a button that saves
my filled in data into a DB table as an XML. I want to be able to notify that the changes to the form have been made using a delegate that another “entity” can invoke.

public void Changes_Made()
{
     //yay. Changes made.
}

protected void okButton_Click(object sender, EventArgs e)
{
    //...
    //save data
    //...
    Changes_Made();
}

Practical scenario is: as i save my preferences, the grid that shows my data will refresh and use the preferences set when i click the ok_button. Does this make any sense?

Answer 1

You can raise a event for notifying the changes.

public ctor() // Method where you want to hook the event, can be constructor or any thing else
{
    //Hook to event
    obj.ChangesMade += Changes_Made; 
    // Here obj is the object of type in which you have okButton_Click 
    // and ChangesMade event declaration

}
public void Changes_Made()
{
     //yay. Changes made. update grid
}


//declare event
public event EventHandler ChangesMade();
protected void okButton_Click(object sender, EventArgs e)
{
    //...
    //save data
    //...

    //raise event
    if(ChangesMade != null)
        ChangesMade(this, new EventArgs());
}