public virtual void Add([NotNull] TKey key, [NotNull] TValue value)
{
if (key is null)
{
throw new ArgumentNullException(nameof(key));
}
if (value is null)
{
throw new ArgumentNullException(nameof(value));
}
if (ContainsKey(key))
{
throw new ArgumentException(@"Already exists", nameof(key));
}
if (ContainsValue(value))
{
throw new ArgumentException(@"Already exists", nameof(value));
}
Base.Add(key, value);
Reversed.Add(value, key);
}
public ImmutableMap <TKey, TValue> Add(TKey key, TValue value)
{
return(new ImmutableMap <TKey, TValue>(Base.Add(key, value), Reversed.Add(value, key)));
}