Using reflection to find interfaces implemented

Question

I have the following case:

public interface IPerson { .. }    
public class Person : IPerson { .. }    
public class User : Person { .. }

Now; if I have a "User" object - how can I check if this implements IPerson using reflection? To be more precise I have an object that might have a property SomeUser, which should be of some type implementing the interface "IPerson". In my case I actually have a User, but this is what I want to check through reflection. I can't figure out how to check the property type since it is a "User", but I want to check if it implements IPerson...:

var control = _container.Resolve(objType); // objType is User here
var prop = viewType.GetProperty("SomeUser");
if ((prop != null) && (prop.PropertyType is IPerson)) 
{ .. }

(Note that this is a simplification of my actual case, but the point should be the same...)

If you already have an object instance you do not need reflection to check whether your object implements a certain interface. You can simply check `if (objUser is IPerson)` — Dirk Vollmar, Oct 05 '09 at 12:14

score 33 · Accepted Answer · answered Oct 05 '09 at 11:31

33

Check the Type.IsAssignableFrom method.

answered Oct 05 '09 at 11:31

Konamiman

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score 20 · Answer 2 · answered Oct 05 '09 at 11:32

20

var control = _container.Resolve(objType); 
var prop = viewType.GetProperty("SomeUser");
if ((prop != null) && (prop.PropertyType.GetInterfaces().Contains(typeof(IPerson))) 
{ .. }

answered Oct 05 '09 at 11:32

Stefan Steinegger

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Thanks, but think I'll go with Type.IsAssignableFrom. – stiank81 Oct 05 '09 at 11:59
Type.IsAssignableFrom actually came back false in a LINQ expression where it should have been true. This Type.GetInterfaces().Contains([Interface Type]) worked. – Juls Jun 23 '21 at 15:18

score 0 · Answer 3 · edited May 23 '17 at 12:25

0

See Implementations of interface through Reflection.

edited May 23 '17 at 12:25

Community

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1

answered Oct 05 '09 at 11:39

SwDevMan81

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Using reflection to find interfaces implemented

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