Call a private method using a String in VB.Net - vb.net

Question

ok I do have class like this.
Namespace mySpace
Public Class ClassA
Private Function MethodA(prm AS Boolean) As Boolean
Return False
End Function
Private Function MethodB() As Boolean
Return False
End Function
End Class
Public Class ClassB
Private Function MethodC() As Boolean
Return True
End Function
Private Function InvokeA() As Boolean
Dim methodObj As MethodInfo
'null pointer except below here
methodObj = Type.GetType("mySpace.ClassA").GetMethod("MethodA")
Dim params As Boolean() = {False}
Return CBool(methodObj.Invoke(New ClassA(), params))
End Function
End Class
End Namespace
What I am trying here is to invoke a method from a different class with parameters using its method. But this returns a null pointer exception. Why? Where I went wrong?

Answer 1

You are doing various things wrong. The following code should work without any problem:
Dim objA As ClassA = New ClassA()
methodObj = objA.GetType().GetMethod("MethodA", BindingFlags.Instance Or BindingFlags.NonPublic)
Dim params As Object() = {False}
methodObj.Invoke(objA, params)
You have various errors which shouldn't allow your code to run at all, namely:
You are retrieving a private method without the adequate
BindingFlags.
You are not passing the arguments as Object type.
Additionally, you are not using GetMethod with an instantiated object of ClassA (e.g., objA above) and instance.GetType(); I am not 100% sure that you need to do that (perhaps you can accomplish it as you intend), but performing this step is a pretty quick process and would allow the code above to work without any problem.