从子元素引用父元素的值

Question

I am trying to figure out a more elegant way to set the property of a parent in c#. I currently pass the parent into the child element, and reference it that way. This seems both cumbersome and possibly even incorrect.

The Child:

 public class ValidatedField<T>
    {
        public OpenIssues parent { get; set; } 
        //Other values
        public void Highlight()
        {
            parent.isNotValid = true;
            isHighlighted = true;
        }
    }

And the Parent:

public class OpenIssues
{
    public OpenIssues()
    {
        DateAppealFiled = new ValidatedField<DateTime?>(this);
    }
    public bool isNotValid { get; set; }
    public ValidatedField<DateTime?> DateAppealFiled { get; set; }
}

Is there a more streamlined way to reference the parent in this case? Or am I doomed to sending the entire parent to the child, just to modify one value in the parent?

Answer 1

Is there a more streamlined way to reference the parent in this case? Or am I doomed to sending the entire parent to the child, just to modify one value in the parent?

The entire parent (in your words) is just a few bytes of reference/pointer

However,

You can essentially do this one of 3 ways

1. Pass in a concrete reference or interface from your parent.
2. Use events/delegate/action and register then trigger them on update
3. Or a decoupled pub/sub messaging system or mediator

What you are doing is fine, though all have their downsides and are cumbersome in different ways

The most modern approach is a decoupled messaging system, this is common in viewmodels where you don't want to couple view models and classes together. However, this is most likely overkill for trivial situations.

Also too, actions and events have their places as well. The parent(or someone) subscribes, and unsubscribes (well... should).

However, if you don't mind the tight coupling of your parent and child, and if there is little need to use them in different parent child configuration, just use references. No harm done.