Property set method not found in a derived type

Question

As disgussed in .NET Reflection set private property one can set a property with a private setter. But when the property is defined in a base class, System.ArgumentException is thrown : "Property set method not found".

An example can be:

using System;
class Test
{
    public DateTime ModifiedOn { get; private set;}
}

class Derived : Test
{
}

static class Program
{
    static void Main()
    {
        Derived p = new Derived ();
        typeof(Derived).GetProperty("ModifiedOn").SetValue(
            p, DateTime.Today, null);
        Console.WriteLine(p.ModifiedOn);
    }
}

Does anyone know a way to tackle this situation?

Edit: The example given is a simple illustration of the problem. In the real world scenario, I do not know if the property is defined in a base class, or defined in the base of the base class.

Answer 1

I had a similar problem where my private property was declared in a base class. I used DeclaringType to get a handle on the class where the property is defined.

using System;
class Test
{
    public DateTime ModifiedOn { get; private set;}
}

class Derived : Test
{
}

static class Program
{
    static void Main()
    {
        Derived p = new Derived ();

        PropertyInfo property = p.GetType().GetProperty("ModifiedOn");
        PropertyInfo goodProperty = property.DeclaringType.GetProperty("ModifiedOn");

        goodProperty.SetValue(p, DateTime.Today, null);

        Console.WriteLine(p.ModifiedOn);
    }
}