Accessing private\protected class methods and members from extension code AX7 (Dynamics 365 for Operations)

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AX 7. Accessing private\protected class methods and members from extension code.

Reference

Reference

Example of dummy class that implements private variable and method:
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class VKOReflectionBase
{
    private int privateVar;
 
    public void new()
    {
        privateVar      = 1;
    }
 
    public static void main(Args _args)
    {
        VKOReflectionBase reflectionTest;
 
        reflectionTest = new VKOReflectionBase();
 
        reflectionTest.run();
    }
 
    public void run()
    {
        this.someExtensionMethod();
        info(strFmt("private: %1", privateVar));
    }
 
    private int privateMethod(int _int, str _str)
    {
        info(strFmt("private method: %1-%2", _int, _str));
        return _int*2;
    }
}
Extension class (Same works for event handlers, just replace this with instance of object):
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using System.Reflection;
 
[ExtensionOf(classStr(VKOReflectionBase))]
final class VKOReflectionBase_Extension
{
    public void setPrivateVar(int _newValue)
    {
        var bindFlags = BindingFlags::Instance | BindingFlags::NonPublic;
        var field = this.GetType().GetField(identifierStr(privateVar), bindFlags);
        // this can be any instantiated object
 
        if (field)
        {
            int localVar = field.GetValue(this); // getting value
            field.SetValue(this, _newValue); // setting value
        }
    }
 
    public void callPrivateMethod()
    {
        System.Object[] parametersArray = new System.Object[2]();
        parametersArray.SetValue(5, 0);
        parametersArray.SetValue('str', 1);
         
        var bindFlags = BindingFlags::Instance | BindingFlags::NonPublic;
  
        var methodInfo = this.GetType().GetMethod(methodStr(VKOReflectionBase, privateMethod), bindFlags);
  
        if (methodInfo)
        {
            int returnValue;
            returnValue = methodInfo.Invoke(this,  parametersArray);
            // Or use "new System.Object[0]()" instead of parametersArray if you do not have any parameters
        }
    }
 
    public void someExtensionMethod()
    {
        this.setPrivateVar(5);
        this.callPrivateMethod();
    }
}

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