Question

Say i have the following two classes:

public class User
    {
        public int ID { get; }

        public string Name { get; set; }

        public void ChangeName(string newName)
        {
            Name = newName;
        }


    }

    public class Mail
    {
        public void SendUserInfoChangeEmail()
        {
            throw new NotImplementedException();
        }
    }

and what i want to do is: when the someone edit user object name using the method ChangeName the SendUserInfoChangeEmail get called automatically.

And i know that i can use events to handle this issue, but what i want is to make a 3rd static class to build in it this events, and will say in the class: attach ChangeName to SendUserInfoChangeEmail

How can i do this?

NOTE:
I don’t want to put any event
handling or delegates in both user
and email classes i want everything
to manage through this third new
static class.

Answer 1

You can create an event on the user class and subscribe to it in a 3rd class.

You may want to look at the INotifyPropertyChanged interface to see how things like this are done by others.

http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(VS.96).aspx