Pollyfill.cs

using System;
using System.Collections.Generic;
 
namespace OSDP.Net.Utilities;

public static class Pollyfill
{
    public static bool TryAdd<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key, TValue value)
    {
        if (dictionary == null)
        {
            throw new ArgumentNullException(nameof(dictionary));
        }
 
        if (!dictionary.ContainsKey(key))
        {
            dictionary.Add(key, value);
            return true;
        }
 
        return false;
    }
}