I have a simple question today about some custom Classes that are not working as desired. For context, this is C# code in Xamarin Forms, building for UWP.
In my C# code, I have two custom classes. We will call them Smaller and Bigger. Smaller is a simple class that only has a few instance variables. My issue is with the Bigger class, which includes a dictionary mapping strings to instances of my Smaller class. When I try to create an Indexer for the Bigger class, I want it to index into the dictionary included in the class.
Here is the code with relevant parts:
public class Smaller {
... // a bunch of instance variables, all strings, public and private versions.
}
public class Bigger {
...
// other instance variables here...
...
// the dictionary in question, mapping to Smaller instances
private Dictionary<string, Smaller> _Info;
public Dictionary<string, Smaller> Info {
get => _Info;
set {
_Info = value;
OnPropertyChanged("Info");
}
}
public Smaller this[string key] { // Indexer for Bigger class
get => _Info[key];
set => Info.Add(key, value);
}
}
It is in the Indexer that I get my error, the NullReferenceException on my getter and setter. What is going wrong here? I have tried for both the getter and setter using the private _Info or public Info and neither one works for either.
The OnPropertyChanged don't affect anything since I have other variables using them which work fine. Should I just get rid of having two variables, private and public? I am just doing that since the code is adapted from a template that uses the private and public instances.
Thanks!
