View.cs

using System.IO;
using System.Web;
using System.Text.RegularExpressions;

namespace Maussoft.Mvc
{
    public class View<TSession> where TSession : new()
    {
        protected WebContext<TSession> Context = null;
        private StringWriter writer = new StringWriter();

        public virtual void Header() { }
        public virtual void Content() { }
        public virtual void Footer() { }

        public string Render(WebContext<TSession> context)
        {
            Context = context;
            this.writer = new StringWriter();
            Header(); Content(); Footer();
            return this.writer.ToString();
        }

        private static string replace(string input, object[] arguments)
        {
            if (arguments.Length == 0) return input;
            return Regex.Replace(input, @"{([0-9]+)}", delegate (Match match)
                {
                    int index;
                    if (!int.TryParse(match.Groups[1].Value, out index)) return match.Value;
                    if (index >= arguments.Length) return match.Value;
                    return HttpUtility.HtmlEncode(arguments[index] as string);
                }
            );
        }

        public void Write(string format, params object[] arguments)
        {
            this.writer.Write(replace(format, arguments));
        }

        public void WriteLine(string format = "", params object[] arguments)
        {
            this.writer.WriteLine(replace(format, arguments));
        }

    }
}