Trigger an event when something changes in a class

Question

Is it possible to trigger some event when something changes in a given class?

E.g. I have a class that has 100 fields and one of them is being modified externally or internally. Now I want to catch this event. How to do this?

The most I wonder if there is a trick to do this quickly for really extended classes.

Answer 1

As a best practice, convert your public fields to manual properties and implement your class with the INotifyPropertyChanged interface in order to raise a change event.

EDIT: Because you mentioned 100 fields I would suggest you to refactor your code like in this great answer: Tools for refactoring C# public fields into properties

Here is an example of it:

private string _customerNameValue = String.Empty;
public string CustomerName
{
    get
    {
        return this._customerNameValue;
    }

    set
    {
        if (value != this._customerNameValue)
        {
            this._customerNameValue = value;
            NotifyPropertyChanged();
        }
    }
}
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
    if (PropertyChanged != null)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

Check this out: INotifyPropertyChanged Interface