Specifying multiple interfaces for a parameter

Question

I have an object that implements two interfaces... The interfaces are:

public interface IObject {     string Name { get; }     string Class { get; }     IEnumerable<IObjectProperty> Properties { get; } } public interface ITreeNode<T> {     T Parent { get; }     IEnumerable<T> Children { get; } } 

such that

public class ObjectNode : IObject, ITreeNode<IObject> {     public string Class { get; private set; }     public string Name { get; private set; }     public IEnumerable<IObjectProperty> Properties { get; set; }     public IEnumerable<IObject> Children { get; private set; }     public IObject Parent { get; private set; } } 

Now i have a function which needs one of its parameters to implement both of these interfaces. How would i go about specifying that in C#?

An example would be

public TypedObject(ITreeNode<IObject> baseObject, IEnumerable<IType> types, ITreeNode<IObject>, IObject parent) {     //Construct here } 

Or is the problem that my design is wrong and i should be implementing both those interfaces on one interface somehow

Answer 1

public void Foo<T>(T myParam)     where T : IObject, ITreeNode<IObject> {     // whatever } 

Answer 2

In C#, interfaces can themselves inherit from one or more other interfaces. So one solution would be to define an interface, say IObjectTreeNode<T> that derives from both IObject and ITreeNode<T>.