C get and set properties for a List Collection

Question

How are properties for a Collection set   I ve created a class with a Collection properties  I want to add to the List anytime I set a new value  Using  name Add value  within the set method doesn t work   Section newSec   new Section     newSec subHead Add  test string    newSec subHead Add  another test string     public class Section       public String head   get  set        private List lt string gt   subHead   new List lt string gt         private List lt string gt   content   new List lt string gt          public List lt string gt  subHead               get           return  subHead            set                        subHead Add value                       public List lt string gt  content               get           return  content            set                        content Add value                       Update with my solution   public class Section        private List lt string gt   head   new List lt string gt         private List lt string gt   subHead   new List lt string gt         private List lt string gt   content   new List lt string gt          public List lt string gt  Head               get           return  head               public List lt string gt  SubHead               get           return  subHead              public List lt string gt  Content               get           return  content               public void AddHeading string line                Head Add line              public void AddSubHeading string line                SubHead Add line              public void AddContent string line                Content Add line

User · Answer

If I understand your request correctly  you have to do the following   public class Section         public String Head               get                       return SubHead LastOrDefault                      set                       SubHead Add value                  public List lt string gt  SubHead   get  private set        public List lt string gt  Content   get  private set         You use it like this   var section   new Section    section Head    Test string     Now  Test string  is added to the subHeads collection and will be available through the getter   var last   section Head     last will be  Test string    Hope I understood you correctly

User · Answer

It would be inappropriate for it to be part of the setter - it s not like you re really setting the whole list of strings - you re just trying to add one   There are a few options    Put AddSubheading and AddContent methods in your class  and only expose read-only versions of the lists Expose the mutable lists just with getters  and let callers add to them Give up all hope of encapsulation  and just make them read write properties   In the second case  your code can be just   public class Section       public String Head   get  set        private readonly List lt string gt   subHead   new List lt string gt         private readonly List lt string gt   content   new List lt string gt             Note  fix to case to conform with  NET naming conventions     public IList lt string gt  SubHead   get   return  subHead          public IList lt string gt  Content   get   return  content          This is reasonably pragmatic code  although it does mean that callers can mutate your collections any way they want  which might not be ideal  The first approach keeps the most control  only your code ever sees the mutable list  but may not be as convenient for callers   Making the setter of a collection type actually just add a single element to an existing collection is neither feasible nor would it be pleasant  so I d advise you to just give up on that idea

User · Answer

Or  public class Section     public String Head   get  set      private readonly List lt string gt   subHead   new List lt string gt       private readonly List lt string gt   content   new List lt string gt        public IEnumerable lt string gt  SubHead   get   return  subHead        public IEnumerable lt string gt  Content   get   return  content         public void AddContent String argValue           content Add argValue          public void AddSubHeader String argValue           subHead Add argValue           All depends on how much of the implementaton of content and subhead you want to hide

User · Answer

Your setters are strange  which is why you may be seeing a problem   First  consider whether you even need these setters - if so  they should take a List lt string gt   not just a string   set        subHead   value      These lines   newSec subHead Add  test string      Are calling the getter and then call Add on the returned List lt string gt  - the setter is not invoked

[c#] C# get and set properties for a List Collection

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