A question about interface inheritance in .NET

Question

Let\'s take the interface IQueryable for example:

public interface IQueryable : IQueryable, IEnumerable;

Sin

Answer 1

The correct definition is:

public interface IQueryable : IEnumerable, IQueryable { }

The following was taken from Microsoft's Source RTMRel\ndp\fx\src\Core\System\Linq\IQueryable.cs\1305376\IQueryable.cs

    public interface IQueryable : IEnumerable {
        Expression Expression { get; } 
        Type ElementType { get; } 

        // the provider that created this query 
        IQueryProvider Provider { get; }
    }

#if SILVERLIGHT 
    public interface IQueryable : IEnumerable, IQueryable {
#else 
    public interface IQueryable : IEnumerable, IQueryable { 
#endif
    } 

    public interface IQueryProvider{
        IQueryable CreateQuery(Expression expression);
        IQueryable CreateQuery(Expression expression); 

        object Execute(Expression expression); 

        TResult Execute(Expression expression);
    } 

    public interface IOrderedQueryable : IQueryable {
    }

#if SILVERLIGHT
    public interface IOrderedQueryable : IQueryable, IOrderedQueryable { 
#else 
    public interface IOrderedQueryable : IQueryable, IOrderedQueryable {
#endif 
    }