public bool TryGetValue(FunctionAttributeIndex key, out ICollection <AttributeValue> value)
{
value = default;
if (ContainsKey(key))
{
return(false);
}
value = new ValueAttributeCollection(Container, key);
return(true);
}
#pragma warning disable CS8767 // IReadOnlyDictionary<TKey,TValue> interface does not have nullability attributes in netstandard2.1, this suppression could be removed after move to .NET 5
public bool TryGetValue(FunctionAttributeIndex key, [MaybeNullWhen(false)] out ICollection <AttributeValue> value)
#pragma warning restore CS8767
{
value = default;
if (this.ContainsKey(key))
{
return(false);
}
value = new ValueAttributeCollection(this.container, key);
return(true);
}
public bool TryGetValue(FunctionAttributeIndex key, /*[MaybeNullWhen( false )]*/ out ICollection <AttributeValue> value)
{
// sadly the runtime provided interface doesn't correctly apply the MaybeNullWhen attribute,
// and the compiler generates warning:
// CS8767: Nullability of reference types in type of parameter 'value' of 'bool ValueAttributeDictionary.TryGetValue(FunctionAttributeIndex key, out ICollection<AttributeValue> value)' doesn't match implicitly implemented member 'bool IReadOnlyDictionary<FunctionAttributeIndex, ICollection<AttributeValue>>.TryGetValue(FunctionAttributeIndex key, out ICollection<AttributeValue> value)' because of nullability attributes.
// Yeah, clear as mud, right?
// So, use the ! to silence the compiler and don't use the attribute, sigh... what a mess...
value = null !;
if (ContainsKey(key))
{
return(false);
}
value = new ValueAttributeCollection(Container, key);
return(true);
}
