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.NET reflection

.NET reflection. By Damián Laufer. Forum .NET 3 rd Meeting ● February 15, 2006. Agenda. What is reflection Getting metadata Object creation / use Embedded resources Performance issues Security (!) Tools. What is Reflection?.

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.NET reflection

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  1. .NET reflection By Damián Laufer Forum .NET 3rd Meeting ● February 15, 2006 Random Logic l Forum .NET l 2006

  2. Agenda • What is reflection • Getting metadata • Object creation / use • Embedded resources • Performance issues • Security (!) • Tools Random Logic l Forum .NET l 2006

  3. What is Reflection? • A set of classes that allow you to access and manipulate assemblies and modules, and the types and the metadata that they contain. Random Logic l Forum .NET l 2006

  4. Getting metadata • Get metadata from an assembly • AssemblyName • Modules • Types (classes, interfaces, value types, enumeration types) • Members (constructors, methods, properties, fields, events) • Parameters Random Logic l Forum .NET l 2006

  5. (classes, interfaces, value types, enumeration types) Random Logic l Forum .NET l 2006

  6. Object creation • Load assemblies dynamically • Create classes • Call members • Get events Random Logic l Forum .NET l 2006

  7. Loading assemblies / types • Assemblies • Asm = Assembly.GetExecutingAssembly • Asm = Assembly.LoadFrom(“path”) • Asm = Assembly.load(“mscorlib”) • Types • Ty = asm.GetType(“Name”) • Ty = GetType(String) • Ty = anInstance.GetType • Ty = Type.GetType(“System.Int32”) Random Logic l Forum .NET l 2006

  8. Embedded resources • Bitmaps • Icons • Cursors • Audio files • Video files • String tables Random Logic l Forum .NET l 2006

  9. Performance issues • Slower (muuuuuuch slower) • So, why should you use it? • Task manager • Data bound list view control • data row<-->class loader (CRUD) Random Logic l Forum .NET l 2006

  10. Security – hang on! • Getting private metadata • Calling private methods • Changing private fields • Getting private events (*) • Creating private classes Random Logic l Forum .NET l 2006

  11. Tools • MSIL Disassembler (Ildasm.exe) (.NET Framework) • Lutz Roeder's .NET Reflector Random Logic l Forum .NET l 2006

  12. Questions? Random Logic l Forum .NET l 2006

  13. Thank You Random Logic l Forum .NET l 2006

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