反射方式。请查看IsAllChildCountsMoreThanZero方法并更改为您想要的方式。

public class ParentClass
        {
            public List<ChildClass1> ChildClass1 { get; set; }
            public List<ChildClass2> ChildClass2 { get; set; }
            public List<ChildClass10> ChildClass10 { get; set; }

            public bool IsAllChildCountsMoreThanZero()
            {
                foreach (var prop in typeof(ParentClass).GetProperties())
                {
                    var propType = prop.PropertyType;

                    if (propType.IsGenericType && (propType.GetGenericTypeDefinition() == typeof(List<>)))
                    {
                        var propertyValue = prop.GetValue(this, null);
                        if (propertyValue == null) return false;
                        var listPropertyValue = (IList)propertyValue;
                        if (listPropertyValue.Count == 0)
                        {
                            return false;
                        }
                    }
                }
                return true;
            }
        }