public class A
    {
        public string Name { get; set; }

        public List<B> Url { get; set; }

    }

    public class B
    {
        /// <summary>
        /// Age
        /// </summary>
        public string Name { get; set; }
    }

 public T Parse<T>(string html) where T : class, new() //T 为A
        {
            var t = new T();
            var properties = t.GetType().GetProperties();
            if (properties == null)
            {
                return t;
            }
            foreach (var item in properties)
            {
                if (item.PropertyType.IsGenericType)
                {
                    var aa = typeof(List<>);
                    var list = aa.MakeGenericType(t.GetType());
                    var testlist = Activator.CreateInstance(list);
                    var a = item.PropertyType.GetGenericArguments().FirstOrDefault();
                    var obj = new List<object>();
                    for (int i = 0; i < 10; i++)
                    {
                        var qc = Activator.CreateInstance(a);
                        foreach (var test in qc.GetType().GetProperties())
                        {
                            test.SetValue(qc, "*******");
                        }
                        obj.Add(qc);
                       
                    }
                    item.SetValue(t, obj);  //这一句报错了了
                }
            }
            return t;
        }