reflection – Page 4 – Tarik Billa

ASP.NET – AppDomain.CurrentDomain.GetAssemblies() – Assemblies missing after AppDomain restart

December 24, 2023 by Tarik

I looked through the ASP.NET MVC 2.0 source code and looked up how AreaRegistration.RegisterAllAreas(); is implemented. This line is usually put into the Global.asax Application_Start() method and internally it scans all Assemblies for types that implement the AreaRegistration abstract type. This is kinda the behaviour I’m after. It appears RegisterAllAreas() makes a call to BuildManager.GetReferencedAssemblies(), … Read more

GetReferencedAssemblies doesn’t return all assemblies

December 24, 2023 by Tarik

Could you please check the assembly’s manifest to see what is referenced here? C# compiler tends to remove referenced assemblies from the manifest if they are not used. Therefore if you don’t refer to any type from assembly B or refer only to constants from assembly B (that are inlined by complier) then you will … Read more

How to call custom operator with Reflection

December 24, 2023 by Tarik

C# compiler converts overloaded operator to functions with name op_XXXX where XXXX is the operation. For example, operator + is compiled as op_Addition. Here is the full list of overloadable operators and their respective method names: ┌──────────────────────────┬───────────────────────┬──────────────────────────┐ │ Operator │ Method Name │ Description │ ├──────────────────────────┼───────────────────────┼──────────────────────────┤ │ operator + │ op_UnaryPlus │ Unary │ │ … Read more

How to get the Array Class for a given Class in Java?

December 24, 2023 by Tarik

Since Java 12 Class provides a method arrayType(), which returns the array type class whose component type is described by the given Class. Please be aware that the individual JDK may still create an instance of that Class³. Class<?> stringArrayClass = FooBar.arrayType() Before Java 12 If you don’t want to create an instance, you could … Read more

Get private Properties/Method of base-class with reflection

December 23, 2023 by Tarik

To get all properties (public/private/protected/internal/static/instance) of a given Type someType, you must access the base class by using someType.BaseType. Example: PropertyInfo[] props = someType.BaseType.GetProperties( BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static)

Accessing Java static final variable value through reflection

December 23, 2023 by Tarik

I would guess that it depends on the type and the compiler (on second thought, it had sure better not!). Sun’s compiler inlines primitive constants, but I don’t know if they remove the entry from the class entirely. I’ll find out. Edit: Yes, you can still access them even if they are inlined. Test class: … Read more

Calling a method on a static class given its type name and method names as strings

December 23, 2023 by Tarik

Just Type.GetType(typeName).GetMethod(methodName).Invoke(null, arguments); where typeName is the name of the type as a string, methodName is the name of the method as a string, and arguments is an array of objects containing the arguments to call the method with.

How to check that type is inherited from some interface c#

December 22, 2023 by Tarik

No, is only works for checking the type of an object, not for a given Type. You want Type.IsAssignableFrom: if (attr != null && typeof(IInterface).IsAssignableFrom(type)) Note the order here. I find that I almost always use typeof(…) as the target of the call. Basically for it to return true, the target has to be the … Read more

How to check if java.lang.reflect.Type is an Enum

December 22, 2023 by Tarik

if(type instanceof Class && ((Class<?>)type).isEnum())

Is there a way to retrieve a PowerShell function name from within a function?

December 21, 2023 by Tarik

You can use $MyInvocation which contains some useful information about what is currently executed. function foo { ‘This function is called {0}.’ -f $MyInvocation.MyCommand }