C# 4.0 dynamic

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Lightning talk presentation for June 2010 ALT.NET

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C# 4.0 dynamic

  1. 1. C# 4.0 dynamic or: How I Learned to Stop Worrying and Love dynamic
  2. 2. “C# is still a statically typed language everywhere that you are not using dynamic” – John Skeet "Oh, well it's statically-typed as a dynamic type.“ – Scott Hanselman blog “C# is evolving nicely by introducing dynamic typing through a static type called dynamic” – Nikhil Kothari
  3. 3. Office Interop object oDocCustomProps = doc.CustomDocumentProperties; Type typeDocCustomProps = oDocCustomProps.GetType(); typeDocCustomProps.InvokeMember( "Item", BindingFlags.Default | BindingFlags.SetProperty, null, oDocCustomProps, new object[] {propertyName, propertyValue}); VS aDoc.CustomDocumentProperties["CustomProperty1"] = "Alt.NET";
  4. 4. Calling Iron* from C# ScriptEngine engine = Ruby.CreateEngine(); ScriptScope scope = engine.CreateScope(); engine.ExecuteFile("tax.rb", scope); var CalculateTax = scope.GetVariable<Func<TaxableItem[], decimal>>("calculate_tax"); var items = new TaxableItem[] { new TaxableItem("Cola", 2.5), new TaxableItem("Donut",1.5) }; var tax = CalculateTax(items); Console.WriteLine("Tax: {0}", tax); Console.ReadLine();
  5. 5. Calling Iron* from C# class Item def calculate_tax(items) def initialize(name, price) total = 0.0 @name = name @price = price items.each do |item| end total += item.price * 0.1 end def name @name return total end end def price @price end end

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