Question

I have to set a property inside an unknown object. The structure looks like this:

        ObjA.ObjB().ObjC.PropA = propValue;

ObjA is from a referenced class. ObjB() is of type object and therefore ObjC is unknown. I thought about using Reflection but don’t know how to use it correctly in this case.

        object objB = ObjA.ObjB();
        Type objBType = objB.GetType();
        System.Reflection.XXXInfo objCInfo = objBType.GetXXX("ObjC");

        Type objCType = objCInfo.GetType();
        System.Reflection.PropertyInfo PropAInfo = objCType.GetProperty("PropA");
        PropAInfo.SetValue(PropAInfo, propValue, null);

Answer (Thanks to BigM):

        dynamic objAB = ObjA.ObjB(); 
        objAB.ObjC.PropA = propValue;

Answer 1

This should probably work for you.

object objB = ObjA.ObjB();
Type objBType = objB.GetType();
System.Reflection.PropertyInfo objCInfo = objBType.GetProperty("ObjC");
object val = objCInfo.GetValue(objB);

Type objCType = val.GetType();
System.Reflection.PropertyInfo PropAInfo = objCType.GetProperty("PropA");
PropAInfo.SetValue(val, propValue, null);

However, I think a bit of re-architecting could be done here to make life a bit easier. For example, if you don’t know anything about the types then you might consider using dynamic and returning dynamic types from ObjC and PropA – but there is a performance hit there.

On the other hand, if there is any way that you can use generics, that would make your life a lot easier. For example, the code here that sets the property value, if that method were generic it might likely be able to define the type of ObjC – but I can’t really infer that with the current snippet.