GenericParser.cs

//https://gist.github.com/JeffreyZhao/297760dcff8c066606e8
public class Parser<T, TResult> {

    public static Func<T, TResult> Func = Emit();

    private static Func<T, TResult> Emit() {
        var method = new DynamicMethod(string.Empty, typeof(TResult), new[] { typeof(T) });
        var il = method.GetILGenerator();
        il.Emit(OpCodes.Ldarg_0);
        il.Emit(OpCodes.Ret);
        return (Func<T, TResult>)method.CreateDelegate(typeof(Func<T, TResult>));
    }
}

public interface ICaller {

    TResult Call<T, TResult>(T arg);
}

public class TicksToDateTimeCaller : ICaller {

    public TResult Call<T, TResult>(T arg) {
        if (typeof(T) != typeof(long) || typeof(TResult) != typeof(DateTime))
            throw new NotSupportedException();

        return Parser<DateTime, TResult>.Func(TicksToDateTime(Parser<T, long>.Func(arg)));
    }

    public DateTime TicksToDateTime(long ticks) {
        return new DateTime(ticks);
    }
}

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