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Код

namespace SerializedTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Assembly serializerAssembly = Assembly.LoadFile(Path.GetFullPath("SerializerAssembly.dll"));            
            Type serializerDirectorType = serializerAssembly.GetType("SerializerAssembly.SerializerDirector");
            try
            {
                Activator.CreateInstance(serializerDirectorType);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            Console.ReadLine();
        }        
    }
}

namespace SerializerAssembly
{    
    public class SerializerDirector
    {
        #region Constructors
        public SerializerDirector()
        {
            this.Load();
        }
        #endregion

        #region Methods
        public void Load()
        {            
            try
            {
                string path = "file.txt";
                TestClass testClass;
                Serializer serializer = new Serializer();

                if (File.Exists(path) == false)
                {
                    testClass = new TestClass();
                    testClass.IntField = 10;
                    testClass.ColorField = Color.Beige;
                    serializer.Serialize(path, testClass);
                }
                else
                {
                    testClass = (TestClass)serializer.Deserialize(path);
                }

                Console.WriteLine(testClass.IntField.ToString());
                Console.WriteLine(testClass.ColorField.ToString());
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            
            Console.ReadLine();
        }
        #endregion
    } 
}

namespace SerializerAssembly
{
    public class Serializer
    {
        #region Constructors
        public Serializer()
        {
        }
        #endregion

        #region Methods
        public void Serialize(string path, object item)
        {
            FileStream fileStream = new FileStream(path, FileMode.Create);
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            binaryFormatter.Serialize(fileStream, item);
            fileStream.Close();
        }

        public object Deserialize(string path)
        {
            FileStream fileStream = new FileStream(path, FileMode.Open);
            BinaryFormatter binaryFormatter = new BinaryFormatter();
            object item = binaryFormatter.Deserialize(fileStream);
            fileStream.Close();
            return item;
        }
        #endregion
    }
}

namespace SerializerAssembly
{
    [Serializable]    
    public class TestClass
    {
        #region Fields
        private int intField;
        private Color colorField;
        #endregion

        #region Constructors
        public TestClass()
        {
            this.intField = 1;
            this.colorField = Color.Aqua;
        }
        #endregion

        #region Properties
        public int IntField
        {
            get
            {
                return this.intField;
            }
            set
            {
                this.intField = value;
            }
        }

        public Color ColorField
        {
            get
            {
                return this.colorField;
            }
            set
            {
                this.colorField = value;
            }
        }
        #endregion
    }
}