Question

Trying to add a class object into a List using reflection, but when invoking the Add method with my class object as a parameter, I get ‘Object does not match target type’

Here’s the snippet code in concern (you can assume classString = "Processor" for now)

PC fetched = new PC();

// Get the appropriate computer field to write to
FieldInfo field = fetched.GetType().GetField(classString);

// Prepare a container by making a new instance of the reffered class
// "CoreView" is the namespace of the program.
object classContainer = Activator.CreateInstance(Type.GetType("CoreView." + classString));

/*
    classContainer population code
*/

// This is where I get the error. I know that classContainer is definitely
// the correct type for the list it's being added to at this point.
field.FieldType.GetMethod("Add").Invoke(fetched, new[] {classContainer});

Then this is part of the class the above code is adding classContainers to:

public class PC
{
    public List<Processor> Processor = new List<Processor>();
    public List<Motherboard> Motherboard = new List<Motherboard>();
    // Etc...
}

Answer 1

You’re trying to call List.Add(Processor) on PC – you want to call it on the value of the field:

field.FieldType.GetMethod("Add").Invoke(field.GetValue(fetched),
                                        new[] {classContainer});

However, I’d personally advise you not to have public fields like this. Consider using properties instead.