The ability to inspect the code in the system and see object types is not reflection, but rather Type Introspection. The ability to change the value of a field marked private in a 3rd party library.For examining and instantiating types in an assembly.To create Generic libraries to handle different formats without redeployments, sometimes referred to, or using Implicit Late Binding.During testing, creating mock objects during runtime initialisation.For getting an Object's Public Attributes.Traditionally used to load modules/classes from assembly and create an instance of them, at runtime. Let's look at the main uses of Reflection and answer some of the questions raised above, I'll try and keep it easy to follow. So this static method GetType uses reflection to obtain the type of the variable! Obviously when writing the code we know that "i" is an Integer but the runtime doesn't have this knowledge to hand, so it must search within itself to figure it out! Most people will have used GetType in the past, but some may have not known how it obtains the type! Net Framework and Common Language Runtime (CLR) use reflection heavily for features such as Intellisense and other IDE features within Visual Studio as well as for serialisation so you'll probably be using reflection without even knowing about it.Įnter fullscreen mode Exit fullscreen modeĪs you would have guessed the output in the console is: System.Int32 Usually I run through examples in JavaScript to keep it understandable for most people, however reflection in JavaScript is not really the same as in precompiled Object Oriented languages such as Java and C#, as it doesn't contain classes per se, so we'll be using examples from those today. So what does that mean? Reflection is a term thrown around every now and again and but do you really know what it means? Why and when it should be used, and what are its main strengths? It's a pretty difficult concept to grasp, but it's well worth the effort to learn as it can make certain seemingly impossible tasks possible. In computer science, reflection is the ability of a computer program to examine, introspect, and modify its own structure and behavior at runtime.
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