id_converter.cs

using System.Linq.Expressions;
using System;
					

public static class Program
{
	public static void Main()
	{
		Console.WriteLine(Program.ConstantOne<double>.Value);
		Console.WriteLine(Program.ConstantOne<int>.Value);
		// or any convertible type
	}
	
	public static class ConstantOne<TNum>
	{
		public static TNum Value { get; private set; }
		
		static ConstantOne()
		{
			var integerConstant = Expression.Constant(1, typeof(int));
			var genericTypeConstant = Expression.Convert(integerConstant, typeof(TNum));
			var lambda = Expression.Lambda<Func<TNum>>(genericTypeConstant);
			Value = lambda.Compile().Invoke();
		}
	}
}