public void Add(string key, IMetadata value)
{
int index;
IMetadata oldMetadata = null;
value.PropertyChanged += ValueOnPropertyChanged;
if (Metadata.ContainsKey(key))
{
MetadataDictionaryPair metadataPair = Metadata[key];
index = metadataPair.Index;
oldMetadata = metadataPair.Metadata;
if (key != value.Name)
{
Metadata.Remove(key);
Metadata.Add(value.Name, metadataPair);
}
else
{
metadataPair.Metadata = value;
}
}
else
{
index = Metadata.Count; // An 'index' is zero-based. Count is not zero-based meaning it is already 1 higher than the last index.
MetadataDictionaryPair metadataPair = new MetadataDictionaryPair();
metadataPair.Index = index;
metadataPair.Metadata = value;
Metadata.Add(key, metadataPair);
}
if (CollectionChanged != null)
{
NotifyCollectionChangedEventArgs changeEventArgs;
if (oldMetadata == null)
{
changeEventArgs = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, value, index);
}
else
{
changeEventArgs = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, value, oldMetadata, index);
}
CollectionChanged(value, changeEventArgs);
}
}
bool ICollection <KeyValuePair <string, IMetadata> > .Contains(KeyValuePair <string, IMetadata> item)
{
if (ContainsKey(item.Key))
{
MetadataDictionaryPair metadataDictionaryPair = Metadata[item.Key];
if (metadataDictionaryPair.Metadata == item.Value)
{
return(true);
}
}
return(false);
}
