Memento.cs

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namespace DesignPatternExamples_csharp
{
    public interface IMemento
    {
        string Name { get; }
    }
 
 
    //########################################################################
    //########################################################################
 
 
    public class Memento_TextObject
    {
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
        // Inner class Memento
 
        internal class Memento : IMemento
        {
            string _name;
 
            string _text;
 
 
            internal Memento(string name, string text)
            {
                _name = name;
                _text = text;
            }
 
 
            internal string Text
            {
                get
                {
                    return _text;
                }
            }
 
            string IMemento.Name
            {
                get
                {
                    return _name;
                }
            }
        }
 
        // End of Inner class Memento
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
        // Private data of the Memento_TextObject class.
 
        string _text;
 
        // End private data of the Memento_TextObject class.
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 
        public Memento_TextObject(string text)
        {
            _text = text;
        }
 
        public string Text
        {
            get
            {
                return _text;
            }
            set
            {
                _text = value;
            }
        }
 
        public IMemento GetMemento(string operationName)
        {
            return new Memento(operationName, _text);
        }
 
 
        public void RestoreMemento(IMemento memento)
        {
            _text = ((Memento)memento).Text;
        }
 
 
        public override string ToString()
        {
            return _text;
        }
    }
}