如何在List <A>（）C＃中</a>设置空对象A

Question

I have a class A like this:

public class Article
{
public Tag Test1 { get; set; } = new Tag();

}

public class Tag
{
public List<News> Test{ get; set; } = new List<News>();
}

I have a list like this:

News 1
   Tag 1{
             News 1
                   **Tag** {
                           News 1
                                Tag {....}
                           News 4
                                Tag {....}
                           News 5
                                Tag {....}
                       }
             News 4
                   Tag {....}
             News 5
                   Tag {....}
         }
News 2
News 3

I want to set null " Tag " 2nd on that list = null to avoid loop infinitely. like this:

News 1
   Tag 1{
             News 1
                   Tag = null
             News 4
                   Tag = null
             News 5
                   Tag = null
          }
News 2
News 3

How to implement that.

Answer 1

Rather than checking for null, you really should be checking for Test1.Count > 0 in your code. Then make sure no one adds any tags to the second level collections.