Instantiating Internal class with private constructor

Question

I am trying to use reflection to create instance of a class. But it is sealed internal and has private constructor. I wonder how can i initiaise it and as its part of framew

Answer 1

If it's internal to an assembly that is not yours and the constructor is marked as private, the author of the assembly is trying very hard to keep you from creating the object.

The below is really evil as you're relying on non-public classes and methods which could change on you without advance notice.

Added: System.ServiceModel.Channels.SelfSignedCertificate is the internal class I am trying to use

Do not do this. The framework could change under you in the blink of an eye ruining your code and all of your hard work.

That said, you could do this:

MethodInfo method = Type.GetType(assemblyQualifiedName).GetMethod("Create");
ABC o = (ABC)method.Invoke(null, new[] { "test" });

This invokes the static method Create. Another option is

MethodInfo method = Type.GetType(assemblyQualifiedName).GetConstructor(
                        BindingFlags.NonPublic | BindingFlags.Instance,
                        null,
                        new[] { typeof(string) },
                        null
                    );
ABC o = (ABC)method.Invoke(new[] { "test" });

which uses reflection to load the constructor that accepts a string as a parameter.

An easy way to get the assembly-qualified name is

string name = typeof(somePublicType).Assembly.GetType("Namespace.ABC");

where somePublicType is a type that is public and in the same assembly as ABC.