![What about 'object' or reflection?
Calculator calc = new Calculator();
int sum = calc.Add(10, 20);
object calc = new Calculator();
int sum = calc.Add(10, 20);
object reflectionCalc = new Calculator();
Type calcType = reflectionCalc.GetType();
object result = calcType.InvokeMember("Add",
BindingFlags.InvokeMethod, null,
Activator.CreateInstance(calcType),
new object[] { 10, 20 });
int sum2 = Convert.ToInt32(result);
Herbstcampus 2013 – Dynamisch und Gefährlich?
16](https://image.slidesharecdn.com/talk-140117015931-phpapp01/85/C-Dynamics-in-the-Wild-14-320.jpg)
![What about 'object' or reflection?
Calculator calc = new Calculator();
int sum = calc.Add(10, 20);
object calc = new Calculator();
int sum = calc.Add(10, 20);
object reflectionCalc = new Calculator();
Type calcType = reflectionCalc.GetType();
object result = calcType.InvokeMember("Add",
BindingFlags.InvokeMethod, null,
Activator.CreateInstance(calcType),
new object[] { 10, 20 });
int sum2 = Convert.ToInt32(result);
Herbstcampus 2013 – Dynamisch und Gefährlich?
17](https://image.slidesharecdn.com/talk-140117015931-phpapp01/85/C-Dynamics-in-the-Wild-15-320.jpg)
![What about 'object' or reflection?
Calculator calc = new Calculator();
int sum = calc.Add(10, 20);
object calc = new Calculator();
int sum = calc.Add(10, 20);
object reflectionCalc = new Calculator();
Type calcType = reflectionCalc.GetType();
object result = calcType.InvokeMember("Add",
BindingFlags.InvokeMethod, null,
Activator.CreateInstance(calcType),
new object[] { 10, 20 });
int sum2 = Convert.ToInt32(result);
Herbstcampus 2013
dynamic calc = new Calculator();
– Dynamisch und Gefährlich?
int sum = calc.Add(10, 20);
18](https://image.slidesharecdn.com/talk-140117015931-phpapp01/85/C-Dynamics-in-the-Wild-16-320.jpg)
C# Dynamics in the Wild
- 1. Dynamisch und Gefährlich? C# Dynamics in freier Wildbahn Tim Bourguignon Mathema Software GmbH v1.1
- 2. Dynamics? Noooooooo.... Herbstcampus 2013 – Dynamisch und Gefährlich? 3
- 3. Dynamics? Noooooooo.... Herbstcampus 2013 – Dynamisch und Gefährlich? 4
- 4. Dynamics? Noooooooo.... Herbstcampus 2013 – Dynamisch und Gefährlich? 5
- 5. Dynamics? Noooooooo.... Herbstcampus 2013 – Dynamisch und Gefährlich? 6
- 6. Compiler says *meep* string lang = "C#"; lang++; int theAnswer = 42; theAnswer.ToUpper(); Herbstcampus 2013 – Dynamisch und Gefährlich? 8
- 7. Compiler says *meep* string lang = "C#"; lang++; int theAnswer = 42; theAnswer.ToUpper(); Herbstcampus 2013 – Dynamisch und Gefährlich? 9
- 8. Dynamics to the rescue dynamic lang = "C#"; lang++; dynamic theAnswer = 42; theAnswer.ToUpper(); Herbstcampus 2013 – Dynamisch und Gefährlich? 10
- 9. Dynamics to the rescue dynamic lang = "C#"; lang++; dynamic theAnswer = 42; theAnswer.ToUpper(); Relax Man, he knows what he's doing Herbstcampus 2013 – Dynamisch und Gefährlich? 11
- 10. Dynamics to the rescue dynamic lang = "C#"; lang++; dynamic theAnswer = 42; theAnswer.ToUpper(); Relax Man, he knows what he's doing Herbstcampus 2013 – Dynamisch und Gefährlich? … or not! 12
- 11. What about 'object' or reflection? Calculator calc = new Calculator(); int sum = calc.Add(10, 20); Herbstcampus 2013 – Dynamisch und Gefährlich? 13
- 12. What about 'object' or reflection? Calculator calc = new Calculator(); int sum = calc.Add(10, 20); object calc = new Calculator(); int sum = calc.Add(10, 20); Herbstcampus 2013 – Dynamisch und Gefährlich? 14
- 13. What about 'object' or reflection? Calculator calc = new Calculator(); int sum = calc.Add(10, 20); object calc = new Calculator(); int sum = calc.Add(10, 20); Herbstcampus 2013 – Dynamisch und Gefährlich? 15
- 14. What about 'object' or reflection? Calculator calc = new Calculator(); int sum = calc.Add(10, 20); object calc = new Calculator(); int sum = calc.Add(10, 20); object reflectionCalc = new Calculator(); Type calcType = reflectionCalc.GetType(); object result = calcType.InvokeMember("Add", BindingFlags.InvokeMethod, null, Activator.CreateInstance(calcType), new object[] { 10, 20 }); int sum2 = Convert.ToInt32(result); Herbstcampus 2013 – Dynamisch und Gefährlich? 16
- 15. What about 'object' or reflection? Calculator calc = new Calculator(); int sum = calc.Add(10, 20); object calc = new Calculator(); int sum = calc.Add(10, 20); object reflectionCalc = new Calculator(); Type calcType = reflectionCalc.GetType(); object result = calcType.InvokeMember("Add", BindingFlags.InvokeMethod, null, Activator.CreateInstance(calcType), new object[] { 10, 20 }); int sum2 = Convert.ToInt32(result); Herbstcampus 2013 – Dynamisch und Gefährlich? 17
- 16. What about 'object' or reflection? Calculator calc = new Calculator(); int sum = calc.Add(10, 20); object calc = new Calculator(); int sum = calc.Add(10, 20); object reflectionCalc = new Calculator(); Type calcType = reflectionCalc.GetType(); object result = calcType.InvokeMember("Add", BindingFlags.InvokeMethod, null, Activator.CreateInstance(calcType), new object[] { 10, 20 }); int sum2 = Convert.ToInt32(result); Herbstcampus 2013 dynamic calc = new Calculator(); – Dynamisch und Gefährlich? int sum = calc.Add(10, 20); 18
- 17. Duck-Typing Herbstcampus 2013 – Dynamisch und Gefährlich? 19
- 18. Duck-Typing Herbstcampus 2013 – Dynamisch und Gefährlich? 20
- 19. Duck-Typing • When I see a bird that walks like a duck swims like a duck and quacks like a duck, I call that bird a duck James Whitcomb Riley Herbstcampus 2013 – Dynamisch und Gefährlich? 21
- 20. Duck-Typing • When I see a bird that walks like a duck swims like a duck and quacks like a duck, I call that bird a duck James Whitcomb Riley vs Be • Look like • Methods & Attributes vs Class Herbstcampus 2013 – Dynamisch und Gefährlich? 22
- 21. Duck-Typing • When I see a bird that walks like a duck swims like a duck and quacks like a duck, I call that bird a duck James Whitcomb Riley vs Be • Look like • Methods & Attributes vs Class Herbstcampus 2013 – Dynamisch und Gefährlich? 23
- 22. Dynamic languages: IronPython - IronRuby Herbstcampus 2013 – Dynamisch und Gefährlich? 24
- 23. Dynamic languages: IronPython - IronRuby #Python script.py def add(a, b): return a + b var pythonRuntime = Python.CreateRuntime(); dynamic pythonScript = pythonRuntime.UseFile("script.py"); var result = pythonScript.add(100, 200))); Herbstcampus 2013 – Dynamisch und Gefährlich? 25
- 24. Base objects & Tools Herbstcampus 2013 – Dynamisch und Gefährlich? 26
- 25. Base objects & Tools DynamicObject Herbstcampus 2013 – Dynamisch und Gefährlich? 27
- 26. Base objects & Tools DynamicObject Herbstcampus 2013 – Dynamisch und Gefährlich? ExpandoObject 28
- 27. Base objects & Tools DynamicObject ExpandoObject ElasticObject Herbstcampus 2013 – Dynamisch und Gefährlich? 29
- 28. Base objects & Tools DynamicObject ExpandoObject ElasticObject Gemini Herbstcampus 2013 – Dynamisch und Gefährlich? 30
- 29. Frameworks Herbstcampus 2013 – Dynamisch und Gefährlich? 31
- 30. Frameworks Massive Herbstcampus 2013 – Dynamisch und Gefährlich? 32
- 31. Frameworks Massive Nancy Herbstcampus 2013 – Dynamisch und Gefährlich? 33
- 32. Frameworks Massive Nancy Herbstcampus 2013 – Dynamisch und Gefährlich? Simple.Data 34
- 33. System.Dynamic.DynamicObject • Exposes members at run time instead of at compile time • Important methods • TrySetMember • TryGetMember • Is called when a member of a dynamic class is requested and no arguments are specified • TryInvokeMember • Is called when a member of a dynamic class is requested with arguments • Combining those functions in a smart way is the key Herbstcampus 2013 – Dynamisch und Gefährlich? 35
- 34. System.Dynamic.ExpandoObject • Represents an object whose members can be dynamically added and removed at run time • Demo • • • • Simple ExpandoObject Expando structure vs Xml structure ExpandoToXml Linq-to-Object http://blogs.msdn.com/b/csharpfaq/archive/2009/10/01/dynamic-in-c-4-0-introducing-the-expandoobject.aspx Herbstcampus 2013 – Dynamisch und Gefährlich? 36
- 35. ElasticObject • Multi level dynamic object implementation using .NET 4.0 dynamic features, for fluent access of data types like XML • Demo • Expando vs Elastic • Elastic-to-Xml https://github.com/amazedsaint/ElasticObject Herbstcampus 2013 – Dynamisch und Gefährlich? 37
- 36. Gemini • „Brings the capabilities of a dynamic type system to C#“ • Demo • • • • • Members on the fly Methods on the fly Object graph Responds to Introspection Herbstcampus 2013 – Dynamisch und Gefährlich? 38
- 37. NancyFx • Lightweight WebFramework • Demo • Parameters • Return object Herbstcampus 2013 – Dynamisch und Gefährlich? 39
- 38. Massive • Wrapper for DB tables that uses dynamics • Create a class that wraps a table • Query away • Demo • Usage • Definition of TryGetMember Herbstcampus 2013 – Dynamisch und Gefährlich? 40
- 39. Conclusion • Objects • Core Objects: DynamicObject, ExpandoObject • Variations: ElasticObject, Gemini • Usages: NancyFx, Massive, Simple.Data • DTOs • Architectural Flexibility • API Design • Think about using it! Herbstcampus 2013 – Dynamisch und Gefährlich? 41
- 40. Ich freue mich auf Eure Fragen! [email protected] about.me/timbourguignon @timothep