using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.diagnostics; namespace consoleapp392 { class program { static void main(string[] args) { adult adult = new adult(18); adult.adultevent += adult_adultevent; adult.age = 20; console.readline(); } private static void adult_adultevent(object sender, adultargs e) { string msg = string.empty; int newage = e.adultage; if(newage>=18) { msg = "adult"; } else { msg = "adolescent"; } console.writeline($"the newly updated age is {newage} and it's {msg} "); } } public class adultargs { public int adultage { get; set; } public adultargs(int age) { adultage = age; } } public class adult { public event eventhandler<adultargs> adultevent; public adult(int adultage) { age = adultage; } private int agevalue; public int age { get { return agevalue; } set { if(value!=agevalue) { agevalue = value; raisepropertychanged(value); } } } private void raisepropertychanged(int value) { adultevent?.invoke(this, new adultargs(value)); } } }
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