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Signum Framework Tutorials Part 2 – Southwind Logic

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15 Nov 2012LGPL325 min read 31.3K   1K   22  
In this part, we will focus on writing business logic, LINQ queries and explain inheritance
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Signum.Utilities;
using System.Web.Mvc;
using System.Web;

namespace Signum.Web
{
    public abstract class JsRenderer
    {
        public Func<string> Renderer { get; set; }
        
        protected JsRenderer()
        {
        }

        public string ToJS()
        {
            return Renderer();
        }
    }

    public class JsInstruction :JsRenderer
    {
        protected JsInstruction()
        {
        }

         public JsInstruction(Func<string> renderer)
        {
            if (renderer == null)
                throw new ArgumentException("renderer");
            this.Renderer = renderer;
        }

        public static JsInstruction operator & (JsInstruction js1, JsInstruction js2)
        {
            return new JsInstruction(() => js1.ToJS() + "; " + js2.ToJS());
        }

        public static implicit operator JsInstruction(string code)
        {
            return new JsInstruction(() => code); 
        }
    }

    public class JsValue<T> : JsRenderer
    {
        public JsValue(string code)
        {
            Renderer = () => code;
        }

        protected JsValue() { }

        public static implicit operator JsValue<T>(T value)
        {
            object obj = (object)value;
            if (obj == null)
                return new JsValue<T>() { Renderer = () => "null" };
            if (obj is bool)
                return new JsValue<T>() { Renderer = () => ((bool)obj) ? "true" : "false" };
            else if (obj is string)
                return new JsValue<T>() { Renderer = () => ((string)obj).Replace("'", "\'").SingleQuote() };
            else
                return new JsValue<T>() { Renderer = () => value.ToString() }; //numbers an other
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The GNU Lesser General Public License (LGPLv3)


Written By
Software Developer (Senior) Signum Software
Spain Spain
I'm Computer Scientist, one of the founders of Signum Software, and the lead developer behind Signum Framework.

www.signumframework.com

I love programming in C#, Linq, Compilers, Algorithms, Functional Programming, Computer Graphics, Maths...

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