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![DynamicObject’s Operations Name Description TryGetMember Member getter, e.g. obj.Name TrySetMember Member setter, e.g. obj.age = 10 TryDeleteMember Member removal (no equivalent in C#) TryInvokeMember Method invocation, e.g. obj.Invoke() TryConvert Casting, e.g. (int)obj TryCreateInstance Object creation (no equivalent in C#) TryInvoke Self invocation, e.g. obj(10) TryBinaryOperation Binary operation, e.g. obj + 10 TryUnaryOperation Unary operation, e.g. !obj TryGetIndex Indexer getter, e.g. obj[“key”] TrySetIndex Indexer setter, e.g. obj[“key”] = value TryDeleteIndex Indexer removal (no equivalent in C#)](https://image.slidesharecdn.com/dynamicbindinginc-101213085853-phpapp01/75/Dynamic-Binding-in-C-4-0-31-2048.jpg)
Dynamic Binding in C# 4.0
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- 2. Buu Nguyen VicePresident of Technology, KMS Technology Lecturer, RMIT University Vietnam Microsoft MVP
- 3. Agenda What isdynamic binding How is it implemented When do we need it Restrictions of dynamic binding
- 4. What is DynamicBinding
- 5. C# Language Evolution C# 4.0 C# 3.0 Dynamic binding (*) Named arguments LINQ (*) Optional parameters Auto- properties Generic variance C# 2.0 Collection initializer Field-like events Object initializer Robust locking Generics (*) Anonymous types Better COM interop Nullable types Extension methods Anonymous methods Partial methods C# 1.0 Yield return Partial type Lambda expressions Expression trees Static class Namespace alias
- 6. Static vs. DynamicBinding Static Binding Dynamic Biding Compiler figures out which All bindings happen during members to call (binding run time process) Defer subtype polymorphic resolution till run time
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- 8. Benefits of StaticBinding Type and name errors are detected at compile time, e.g. Invoke non-existent members Pass in arguments with wrong type Perform illegal cast
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- 10. How Is ItImplemented?
- 11. Run Time Binding Instead of attempting binding and generating CIL, the compiler packages the call and sends it to the Dynamic Language Runtime At run time, the DLR performs binding and execution
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- 13. The Dynamic LanguageRuntime
- 14. Process in anutshell C# Dynamic builds dynamic Objects User-defined or from other languages compiled uses IDynamicMetaObjectProvider Call Sites cached Delegate Expression emits Tree DLR C# Binder builds
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- 16. When Do WeNeed It?
- 17. Key Scenarios 1. Accessa member with only knowledge of its name, arguments, and target object 2. Interop with dynamic languages, e.g. IronRuby, IronPython 3. Have the target object decide how to respond to a call at run time
- 18. Key Scenarios 1. Accessa member with only knowledge of its name, arguments, and target object 2. Interop with dynamic languages, e.g. IronRuby, IronPython 3. Have the target object decide how to respond to a call at run time
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- 22. Single vs. MultipleDispatch Single Dispatch Multiple Dispatch Method is selected based Method is selected based on the runtime type of the on both the runtime type target object of the target object and those of the method’s arguments
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- 24. Key Scenarios 1. Accessa member with only knowledge of its name, arguments, and target object 2. Interop with dynamic languages, e.g. IronRuby, IronPython 3. Have the target object decide how to respond to a call at run time
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- 26. Work with RubyClass
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- 28. Key Scenarios 1. Accessa member with only knowledge of its name, arguments, and target object 2. Interop with dynamic languages, e.g. IronRuby, IronPython 3. Have the target object decide how to respond to a call at run time
- 29. The Magic Interface IDynamicMetaObjectProvider ExpandoObject DynamicObject
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- 31. DynamicObject’s Operations Name Description TryGetMember Member getter, e.g. obj.Name TrySetMember Member setter, e.g. obj.age = 10 TryDeleteMember Member removal (no equivalent in C#) TryInvokeMember Method invocation, e.g. obj.Invoke() TryConvert Casting, e.g. (int)obj TryCreateInstance Object creation (no equivalent in C#) TryInvoke Self invocation, e.g. obj(10) TryBinaryOperation Binary operation, e.g. obj + 10 TryUnaryOperation Unary operation, e.g. !obj TryGetIndex Indexer getter, e.g. obj[“key”] TrySetIndex Indexer setter, e.g. obj[“key”] = value TryDeleteIndex Indexer removal (no equivalent in C#)
- 32. Log Setters &Invocations
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- 35. Close to themetal
- 36. …Close to themetal
- 37. …Close to themetal
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- 39. Restriction #1 Doesn’twork with extension methods
- 40. Restriction #2 Can’tresolve static members or constructors on a dynamic type
- 41. Restriction #3 Methodgroups, anonymous methods and lambda expressions to be casted to exact type
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- 44. References DLR specsfrom http://dlr.codeplex.com/documentation C# in Depth, 2nd, Jon Skeet, Manning, 2010 Pro DLR in .NET 4.0, Chaur Wu, Apress, 2010