get Attribute[] from lambda

get-attrs.cs

public static Attribute[] GetAttributes(Expression expr)
{
    switch (expr.NodeType)
    {
        case ExpressionType.MemberAccess:
            return Attribute.GetCustomAttributes(((MemberExpression) expr).Member);
        case ExpressionType.Invoke:
            return Attribute.GetCustomAttributes(((MethodCallExpression) expr).Method);
        case ExpressionType.Index:
            return Attribute.GetCustomAttributes(((IndexExpression) expr).Indexer);
        default:
            return new NotSupportedException(expr.NodeType);
    }
}

public static Attribute[] GetAttributes<T>(Expression<Func<object>> selector)
{
    return GetAttributes(selector.Body);
}

public static Attribute[] GetAttributes<T>(this T recv, Expression<Func<T, object>> selector)
{
    return GetAttributes(selector.Body);
}