Simple extension method to pull a subtyped value from a dictionary.

DictionaryExtensions.cs

using System.Collections.Generic;

public static class IDictionaryExtensions
{
	public static bool TryGetValue<TKey, TOutValue, TInValue>(this IDictionary<TKey, TInValue> source, TKey key, out TOutValue value) 
		where TInValue : TOutValue
	{
		if (source.TryGetValue(key, out var temp))
		{
			value= temp;
			return true;
		}
		
		value = default;
		return false;
	}
}