MaggyD
MaggyD
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Created by MaggyD on 12/4/2024 in #help
Idiomatic C# Data Objects with Immutable Collections?
Hello, I'm trying to understand the best way to define a class that holds collection of some data that is completely immutable, yet serializable and deserilazable by System.Text.Json. For instance, I want this class to just represent a JSON document from the front-end application, it can be seen as a form of DTO as some sort. However, after spending 30 minutes online and asking ChatGPT, I feel like I still don't have a clear guide on how to construct a class with collections. I have tried multiple things in my experience with C#. Backing fields. Just making them mutable and ignoring the warnings. Some combination of the previous two??? Please help. Thanks, Maguire
24 replies
CC#
Created by MaggyD on 9/19/2022 in #help
Achieving polymorphism for an association
Hi, I'm curious about the nature of run-time/compile-time polymorphism when a parent object is associated with some other object. What I mean by association is that an object keeps that parent class as a reference, i.e., it owns it. What I'm trying to figure out right now in my application is how can I associate children of the parent in substitution for the parent class, yet some how gain access to child specific attributes and methods. Is this possible? Examples: 
public class ContainerClass {

  private ParentClass _parent;
  
  public ContainerClass(ParentClass parentClass) {
    _parent = parentClass;
  }

}

public class ParentClass {
...
}

public class ChildClassOne : ParentClass {

}

public class ChildClassTwo : ParentClass {

}
public class ContainerClass {

  private ParentClass _parent;
  
  public ContainerClass(ParentClass parentClass) {
    _parent = parentClass;
  }

}

public class ParentClass {
...
}

public class ChildClassOne : ParentClass {

}

public class ChildClassTwo : ParentClass {

}
14 replies