Using Reflection to get all properties of an object not implemented by an interface

Question

I want to be able use reflection to loop through the properties of an object that DO NOT implement an interface

Essentially I want to achieve the opposite of this How do I use reflection to get properties explicitly implementing an interface?

The reason is I want to map objects to another object where any properties that are not defined by an interface are added instead to a List of KeyValuePairs.

Nothing is ever implemented *by* an interface. Do you mean you want all the properties that are *not* implementing an interface? — Matthew Watson, Mar 15 '13 at 14:35
@MatthewWatson: nitpicking, but: do you mean to ask OP whether he wants all properties that _do not participate_ in an interface implementation? — CodeCaster, Mar 15 '13 at 14:35
@StewartAlan please show some source code... what have you tried ? what exactly is not working ? — Yahia, Mar 15 '13 at 14:40
@StewartAlan: Is the interface implement explicitly or implicitly? — Jon Egerton, Mar 15 '13 at 14:42

score 11 · Accepted Answer · answered Mar 15 '13 at 14:39

11

Using this example:

interface IFoo
{
  string A { get; set; }
}
class Foo : IFoo
{
  public string A { get; set; }
  public string B { get; set; }
}

Then using this code, I get only PropertyInfo for B.

  var fooProps = typeof(Foo).GetProperties();
  var implementedProps = typeof(Foo).GetInterfaces().SelectMany(i => i.GetProperties());
  var onlyInFoo = fooProps.Select(prop => prop.Name).Except(implementedProps.Select(prop => prop.Name)).ToArray();
  var fooPropsFiltered = fooProps.Where(x => onlyInFoo.Contains(x.Name));

answered Mar 15 '13 at 14:39

LukeHennerley

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This is assuming that the implementing property name matches the name of the property on the interface, which isn't necessarily the case. – Jon Egerton Mar 15 '13 at 14:40
@JonEgerton so it would be possible for `A` in `Foo` to be `C`, for example? – LukeHennerley Mar 15 '13 at 14:41
1

That's defo possible in VB.Net, not sure about C#. Might not be an issue if the OP can assume he's not working with VB.Net assemblies. – Jon Egerton Mar 15 '13 at 14:45
@JonEgerton If not, I can't understand how they can be different? You can't have `public string C {get; set;}` and that handles the `IFoo.A` implementation. I can't understand what you mean :) – LukeHennerley Mar 15 '13 at 14:45
1

@JonEgerton Seeing as the tag is `C#` I can't see how that is possible. I understand if this was `VB.Net` because you would have `Public Property C As String Implements IFoo.A`. That is not valid in C# as far as I am aware. – LukeHennerley Mar 15 '13 at 14:47
1

In VB you can have `Public Property C As String Implements IFoo.A` Not sure if the same can be done with C#'s syntax. Its actually useful where you implement interfaces with the same property names. – Jon Egerton Mar 15 '13 at 14:47
Thanks, that does exactly what I need it to. – Stewart Alan Mar 15 '13 at 15:32

Using Reflection to get all properties of an object not implemented by an interface

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