public bool TryAdd(TKey key, TValue value)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
var weakKey = new WeakKeyReference <TKey>(key, _comparer);
var weakValue = WeakReference <TValue> .Create(value);
_removeWeakReferencesInNull();
return(_dictionary.TryAdd(weakKey, weakValue));
}
public TValue GetOrAdd(TKey key, Func <object, TValue> valueFactory)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
WeakReference <TKey> weakKey = new WeakKeyReference <TKey>(key, _comparer);
_removeWeakReferencesInNull();
var res = _dictionary.GetOrAdd(weakKey, mKey => WeakReference <TValue> .Create(valueFactory(mKey)));
return(res.Target);
}
public TValue GetOrAdd(TKey key, Func <object, TValue> valueFactory)
{
if (key is null)
{
throw new ArgumentNullException(nameof(key));
}
var weakKey = new WeakKeyReference <TKey>(key, _comparer);
_removeWeakReferencesInNull();
WeakReference <TValue> res;
while (true)
{
res = _dictionary.GetOrAdd(weakKey, (mKey, eKey) => WeakReference <TValue> .Create(valueFactory(eKey)), key);
if (res.IsAlive)
{
break;
}
_dictionary.TryRemove(weakKey, out _);
}
return(res.Target);
}
public bool TryAdd(TKey key, TValue value)
{
if (key is null)
{
throw new ArgumentNullException(nameof(key));
}
var weakKey = new WeakKeyReference <TKey>(key, _comparer);
if (_dictionary.TryGetValue(weakKey, out var oValue))
{
if (!oValue.IsAlive)
{
_dictionary.TryRemove(weakKey, out _);
}
else
{
return(false);
}
}
var weakValue = WeakReference <TValue> .Create(value);
_removeWeakReferencesInNull();
return(_dictionary.TryAdd(weakKey, weakValue));
}
protected override void SetValue(TKey key, TValue value)
{
var weakKey = new WeakKeyReference <TKey>(key, _comparer);
_dictionary[weakKey] = WeakReference <TValue> .Create(value);
}
