Joel Holder's Select Field Notes

Here’s an interesting little class that I initially created to do dynamic arithmetic.  However, after getting the concept up and running, it turns out to be a lot more powerful.  The idea is to start up a hosted JavaScript runtime inside the CLR runtime and present it with string of JavaScript code for immediate inline…

Here’s a small extension to $ that programmatically selects the text beneath a jQuery object.  It works cross-browser.

.NET 4.0’s DynamicObject provides a quick and easy way to hook into and control how a call for a method is dispatched at runtime.  This so called “late dispatch” capability is exactly what we need to easily create dynamic facades over out-of-process APIs, such as those of remote REST services. In this post, I’ll show…

Today a colleague and I were going through some code.  I have recently been trying to impart to him the power and beauty in the functional programing paradigm in C#.  Today, the opportunity to demonstrate it presented itself as I was showing him how to use extension methods to extend Entities and ValueObjects with a…

First, we shim the Ruby Object class with a profiling aspect, in this case an additional method called profile that will wrap any existing method with timing code that we tell it to. Lets put this in a file called: aop_extension.rb. class Object   def Object.profile symbol     _symbol = (“rprof_” + symbol.to_s).to_sym     alias_method…

The C# Expression API allows you to scrape property and method definitions from Types and work with them as external references.  See here: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Linq.Expressions; using System.Dynamic; using System.Runtime.CompilerServices; public static class Extensions  {        public static Func GetPropertyFunction(this Type source, string name) { ParameterExpression param = Expression.Parameter(typeof(X), “arg”);              MemberExpression member =…

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel;using System.Collections.Specialized; namespace DynamicSpikes{    public class ObservableDictionary : Dictionary, INotifyPropertyChanged, INotifyCollectionChanged    {         public event PropertyChangedEventHandler PropertyChanged = delegate { };        public event NotifyCollectionChangedEventHandler CollectionChanged = delegate { };         private void OnCollectionChanged(object sender, NotifyCollectionChangedAction action, object value)        {            if (CollectionChanged != null)            {                CollectionChanged(sender, new NotifyCollectionChangedEventArgs(action, value));            }        }         private void OnPropertyChanged(object sender, string propertyName)        {            if…

        public static string WhoCalledMe()        {              var st = new StackTrace();              var sf = st.GetFrame(1);              var mb = sf.GetMethod();              return mb.Name;        }