public Func <T, T, T> AddFunc <T>()
{
var paramExp1 = Expression.Parameter(typeof(T));
var paramExp2 = Expression.Parameter(typeof(T));
var expBody = Expression.AddAssign(paramExp1, paramExp2);
var lambdExp = Expression.Lambda <Func <T, T, T> >(expBody, new[] { paramExp1, paramExp2 });
return(lambdExp.Compile());
}