Can I use Expression> and reliably see which properties are referenced in the Func?

Question

I\'m writing something in the flavour of Enumerable.Where in that takes a predicate of the form Func. If the underlying T

Answer 1

Small code example of a visitor that would find directly referenced properties.

public class PropertyAccessFinder : ExpressionVisitor {
    private readonly HashSet _properties = new HashSet();

    public IEnumerable Properties {
        get { return _properties; }
    }

    protected override Expression VisitMember(MemberExpression node) {
        var property = node.Member as PropertyInfo;
        if (property != null)
            _properties.Add(property);

        return base.VisitMember(node);
    }
}

// Usage:
var visitor = new PropertyAccessFinder();
visitor.Visit(predicate);
foreach(var prop in visitor.Properties)
    Console.WriteLine(prop.Name);