是否可以在不强制转换的情况下调用基础对象的方法？

Question

EDIT. I'm sorry for the typo. Both objects are independent. OBJ1 is actually from a 3rd party and i have no access to its constructor so I built my own with some of its functionality and some of my own.

I have a method which will be called using OBJ1 as a parameter. I have a need to write the exact same routine but passing OBJ2 as a paramater. OBJ1 and OBJ2 are not identical but they do have a property in common: Prop1.

Details: OBJ1 is a 3rd party object with no public constructor so for testing, I created my own object which is "similar" but in no way identical to the original. They have some properties in common including: Prop1.

I'd like to do this:

   private ObjectTypeA OBJ1 = new ObjectTypeA();
   private ObjectTypeB OBJ2 = new ObjectTypeB();
   main() 
   {
        GetPlacedOrderIDFromTag(OBJ1);
        GetPlacedOrderIDFromTag(OBJ2);

   }
   private void FunctionA (object _obj)
    {
        // I know this object has this property.  
         _obj.Prop1 = true;
    }

I tried implementing a partial interface like this: private partial interface IOrderUserTag { bool Prop1 { get; set; } } private partial interface IOrderUserTag { bool Prop1 { get; set; } }

but since OBJ1 is a 3rd party object, I cannot get the compiler to know that it adheres to this interface.

'Would love an idea for not having duplicate code I need to maintain.

Thanks, -Ed

Answer 1

C# does provide duck typing -- the dynamic keyword:

((dynamic)_obj).Prop1 = true;

That will work as long as _obj has a boolean setter called Prop1 (casing matters).

The other way to do it is to drop down to reflection level, it provides functions to search up and down the list of properties and you can call them with your own parameters.

Answer 2

Here's the Reflection way of doing it:

    public void DoStuff(object obj)
    {
        PropertyInfo prop = obj.GetType().GetProperty("Prop1");

        if (prop != null && prop.PropertyType == typeof(bool) && prop.CanWrite)
        {
            prop.SetValue(obj, true);
        }
    }

You can put in whatever checks you feel necessary into the if statement.

Answer 3

Only if this applies, you just need to call same routines with different objects?

public void FunctionA<T>(T obj)
{
  //obj.GetType().GetProperty("Prop1").SetValue(obj, true, null); 
}