using System;
using System.Collections.Generic;
using System.Reflection;

public class Test
{
	interface ICell
	{
		void Set(String s);
		String Get();
		Type Type();
	}
	class DelgCell : ICell
	{
		public void Set(String s) { setF(s); }
		public String Get() { return getF(); }
		public Type Type() { return getT(); }
		public delegate T GetDelg<T>();
		Action<String> setF;
		GetDelg<String> getF;
		GetDelg<Type> getT;
		public DelgCell(Action<String> setF, GetDelg<String> getF, GetDelg<Type> getT)
		{
			this.setF = setF;
			this.getF = getF;
			this.getT = getT;
		}
	}
	static ICell Bind<T>(T[] v, int arrayIndex)
	{
		if (typeof(T) == typeof(int))
		{
			return new DelgCell(
				delegate(String s) { (v as int[])[arrayIndex] = int.Parse(s); },
				delegate() { return v[arrayIndex].ToString(); },
				delegate() { return typeof(int); }
			);
		}
		else { throw new Exception("" + typeof(T)); }
	}
	static ICell Bind<T>(T v, String fieldName)
	{
		FieldInfo f = typeof(T).GetField(fieldName);
		if (f.FieldType == typeof(int))
		{
			return new DelgCell(
				delegate(String s) { f.SetValue(v, int.Parse(s)); },
				delegate() { return f.GetValue(v).ToString(); },
				delegate() { return f.FieldType; }
			);
		}
		else { throw new Exception("" + typeof(T)); }
	}
	class Entry
	{
		public int n;
		public int[] na = new int[15];
	}
	public static void Main()
	{
		{
			Entry et = new Entry();
			et.na[12] = 100;
			ICell c = Bind(et.na, 12);

			c.Set("200");
			et.na[12] += 50;
			Console.WriteLine(et.na[12] + " " + c.Get() + " " + c.Type()); // "250 250 System.Int32"
		}
		{
			Entry et = new Entry();
			et.n = 400;
			ICell c = Bind(et, "n");

			c.Set("500");
			et.n += 50;
			Console.WriteLine(et.n + " " + c.Get() + " " + c.Type()); // "550 550 System.Int32"
		}
	}
}