Dynamics & Object Runtime Composition with C# 4.0
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The document discusses the capabilities of C# 4.0, particularly focusing on dynamic types and object runtime composition. It illustrates how object types can be modified at runtime without compiler errors and demonstrates the use of ExpandoObject for adding properties and methods dynamically. Examples provided highlight the expressiveness and flexibility of C# through runtime modifications.
Dynamics & Object Runtime Composition with C# 4.0
- 1. Jon LimjapMicrosoft Most Valuable Professional for Visual C#Senior Application Developer, FBM e-ServicesDynamics & Object Runtime Composition with C# 4.0
- 6. Why dynamic?
- 7. ExpressivenessTell me what to do……not how to do it
- 8. Duck TypingIf it quacks, it’s a duck!
- 9. Object Runtime ModificationObject types can be modified on runtime
- 10. Dynamic at compile timedynamic myObj = "blah";System.String at run time
- 11. dynamic myObj = "blah";Console.WriteLine(myObj.Contains("lah"));Console.WriteLine(myObj.IndexOf("x"));Console.WriteLine(myObj.GetType());myObj = new List<int>();Console.WriteLine(myObj.Count);Console.WriteLine(myObj.GetType());Change of type hereBut no compiler errors!Method signature doesn’t match initial type
- 13. mrFantastic.SayMyName = new Action(() => Console.WriteLine(mrFantastic.Name));mrFantastic.GetAge = new Func<int>(() => Convert.ToInt32((DateTime.Now - mrFantastic.BirthDate).Days / 365.25));mrFantastic.SayMyName();Console.WriteLine(mrFantastic.GetAge());Methods could be added using Action<T> & Func<T>