Question

I have an object model that looks like this:

public class MyModel
{
    public List<MyOtherObject> TheListOfOtherObjects { get; set; }

    public List<int> MyOtherObjectIDs { get; set; }

    public void GetListOfMyOtherObjectIDs() 
    {
       // function that extracts the IDs of objects in
       // the list and assigns it to MyOtherObjectIDs
    }
}

At the moment, I’ve got some code that executes GetListOfMyOtherObjectIDs when TheListOfOtherObjects gets populated from a query. Now I’ve got another place in the code that populates this list as well and when it does, it also needs to execute the GetListOfMyOtherObjectIDs function.

Is there a way to make this process automatic so that when TheListOfOtherObjects is popuplated, regardless of which code triggers it, the object model will automatically execute GetListOfMyOtherObjectIDs?

Answer 1

Use you own set accessor:

public class MyModel
{
    private List<MyOtherObject> _TheListOfOtherObjects;
    public List<MyOtherObject> TheListOfOtherObjects {
        get { return _TheListOfOtherObjects; }
        set { _TheListOfOtherObjects = value; GetListOfMyOtherObjectIDs(); }
    }

    public List<int> MyOtherObjectIDs { get; set; }

    public void GetListOfMyOtherObjectIDs() 
    {
       // function that extracts the IDs of objects in
       // the list and assigns it to MyOtherObjectIDs
    }
}