Attributes, reflection, and dynamic programming
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All about Attributes, Reflection, and Dynamic Programming
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Attributes, reflection, and dynamic programming
- 1. Attributes, Reflection, and Dynamic Programming Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
- 3. Decorating Code With • Demo
- 4. Examples of Applications That Use Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
- 5. Examples of Applications That Use • Attributes are meta-data you can add to code Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
- 6. Examples of Applications That Use • Attributes are meta-data you can add to code • Examples of applications: Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
- 7. Examples of Applications That Use • Attributes are meta-data you can add to code • Examples of applications: • The C# compiler Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
- 8. Examples of Applications That Use • Attributes are meta-data you can add to code • Examples of applications: • The C# compiler • Web Services Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
- 9. Examples of Applications That Use • Attributes are meta-data you can add to code • Examples of applications: • The C# compiler • Web Services • Unit testing Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
- 11. C# Compiler Attribute • ObsoleteAttribute marks code as being deprecated
- 12. C# Compiler Attribute • ObsoleteAttribute marks code as being deprecated • ConditionalAttribute removes code when a pre-processing directive isn’t defined
- 13. C# Compiler Attribute • ObsoleteAttribute marks code as being deprecated • ConditionalAttribute removes code when a pre-processing directive isn’t defined • DllImportAttribute enables calling Windows OS APIs
- 15. Creating New Attributes • Demo
- 17. Deriving From Attribute • Derive a new class from Attribute, a .NET Framework type
- 18. Deriving From Attribute • Derive a new class from Attribute, a .NET Framework type • Give your class a suffix of “Attribute”
- 19. Deriving From Attribute • Derive a new class from Attribute, a .NET Framework type • Give your class a suffix of “Attribute” • i.e. TestAttribute
- 20. Deriving From Attribute • Derive a new class from Attribute, a .NET Framework type • Give your class a suffix of “Attribute” • i.e. TestAttribute • Not required, but a common convention
- 21. Specifying Named and Positional Parameters
- 22. Specifying Named and Positional Parameters • Positional parameters appear first
- 23. Specifying Named and Positional Parameters • Positional parameters appear first • Named parameters follow
- 24. Specifying Named and Positional Parameters • Positional parameters appear first • Named parameters follow • For:
- 25. Specifying Named and Positional Parameters • Positional parameters appear first • Named parameters follow • For: [DllImport("shell32.dll", EntryPoint="FindExecutable")]
- 26. Specifying Named and Positional Parameters • Positional parameters appear first • Named parameters follow • For: [DllImport("shell32.dll", EntryPoint="FindExecutable")] • “shell32.dll” is positional
- 27. Specifying Named and Positional Parameters • Positional parameters appear first • Named parameters follow • For: [DllImport("shell32.dll", EntryPoint="FindExecutable")] • “shell32.dll” is positional • EntryPoint="FindExecutable" is named
- 29. Decorating with AttributeUsageAttribute • Three Parameters
- 30. Decorating with AttributeUsageAttribute • Three Parameters • AllowMultiple – can use attribute more than once
- 31. Decorating with AttributeUsageAttribute • Three Parameters • AllowMultiple – can use attribute more than once • Inherited – applies to derived classes
- 32. Decorating with AttributeUsageAttribute • Three Parameters • AllowMultiple – can use attribute more than once • Inherited – applies to derived classes • ValidOn – defines where allowed to use
- 33. Using Reflection
- 35. Getting Type and TypeInfo
- 36. Getting Type and TypeInfo • Reflection API split into two types
- 37. Getting Type and TypeInfo • Reflection API split into two types • Type provides reference support
- 38. Getting Type and TypeInfo • Reflection API split into two types • Type provides reference support • TypeInfo offers execution support
- 40. Exploring Type Members • Once you have a type, you can query its members:
- 41. Exploring Type Members • Once you have a type, you can query its members: • GetFields
- 42. Exploring Type Members • Once you have a type, you can query its members: • GetFields • GetMethods
- 43. Exploring Type Members • Once you have a type, you can query its members: • GetFields • GetMethods • GetProperties
- 44. Exploring Type Members • Once you have a type, you can query its members: • GetFields • GetMethods • GetProperties • GetXxx
- 45. Exploring Type Members • Once you have a type, you can query its members: • GetFields • GetMethods • GetProperties • GetXxx • Continue to explore as you need
- 47. Dynamic Invocation • You can dynamically invoke/run methods discovered through reflection
- 48. Dynamic Invocation • You can dynamically invoke/run methods discovered through reflection • Get object reference, if instance
- 49. Dynamic Invocation • You can dynamically invoke/run methods discovered through reflection • Get object reference, if instance • Specify parameters
- 50. Dynamic Invocation • You can dynamically invoke/run methods discovered through reflection • Get object reference, if instance • Specify parameters • Call Invoke(…)
- 51. Dynamic Invocation • You can dynamically invoke/run methods discovered through reflection • Get object reference, if instance • Specify parameters • Call Invoke(…) • Code runs
- 53. Coding Dynamic Types • Demo
- 55. Using Dynamic Types • Declare type as dynamic
- 56. Using Dynamic Types • Declare type as dynamic • Can call any member
- 57. Using Dynamic Types • Declare type as dynamic • Can call any member • Can assign to any member
- 58. Using Dynamic Types • Declare type as dynamic • Can call any member • Can assign to any member • No compile-time error
- 59. Using Dynamic Types • Declare type as dynamic • Can call any member • Can assign to any member • No compile-time error • Errors surface as runtime exceptions
- 61. The Expando Object • Lets you add/remove members dynamically
- 62. The Expando Object • Lets you add/remove members dynamically • Can pass object reference as parameter
- 63. The Expando Object • Lets you add/remove members dynamically • Can pass object reference as parameter • Use members dynamically too
- 64. The Expando Object • Lets you add/remove members dynamically • Can pass object reference as parameter • Use members dynamically too • Get notified when add/remove occurs
- 65. Implementing
- 66. Implementing • Derive from DynamicObject
- 67. Implementing • Derive from DynamicObject • Overrides let you do anything dynamically
- 68. Implementing • Derive from DynamicObject • Overrides let you do anything dynamically • Examples of methods you can override
- 69. Implementing • Derive from DynamicObject • Overrides let you do anything dynamically • Examples of methods you can override • TrySetMember
- 70. Implementing • Derive from DynamicObject • Overrides let you do anything dynamically • Examples of methods you can override • TrySetMember • TryGetMember
- 71. Implementing • Derive from DynamicObject • Overrides let you do anything dynamically • Examples of methods you can override • TrySetMember • TryGetMember • TryInvokeMember
- 72. Questions? Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
- 73. Questions? http:// www.LearnNowOnline.com Learn More @ http://www.learnnowonline.com Copyright © by Application Developers Training Company
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