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 framework, I can only use reflection to take it out?

internal sealed class ABC {     private ABC(string password){}     public static ABC Create(string password){}; } 

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

Answer 1

EDIT: I hadn't noticed that you mentioned that the type you're trying to initialize is part of the .NET framework. I thought it was one of your own types, just referenced from elsewhere.

I would strongly urge you not to attempt this. Microsoft are perfectly at liberty to change or remove internal classes between framework releases - your code will be incredibly brittle if you rely on implementation details like this.

Change your design to avoid needing to do this.

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Original answer:

Yes, you'd have to use reflection - like this:

using System; using System.Reflection;  internal sealed class ABC {     private ABC(string password)     {         Console.WriteLine("Constructor called");     } }  public class Test {     static void Main()     {         ConstructorInfo ctor = typeof(ABC).GetConstructors             (BindingFlags.Instance | BindingFlags.NonPublic)[0];          ABC abc = (ABC) ctor.Invoke(new object[] { "test" });     } } 

Note that violating access modifiers in this way requires the ReflectionPermissionFlag.MemberAccess permission. If you know there will be a static method called Create, you'd be better off invoking that via reflection:

using System; using System.Reflection;  internal sealed class ABC {     private ABC(string password)     {         Console.WriteLine("Constructor called");     }      public static ABC Create(string password)     {         return new ABC(password);     } }  public class Test {     static void Main()     {         MethodInfo method = typeof(ABC).GetMethod("Create",             BindingFlags.Static | BindingFlags.Public);          ABC abc = (ABC) method.Invoke(null, new object[]{"test"});     } }