public static void OnArtistImageChanged(string artistName, ArtistImageChangedEventHandler callback)
{
var cacheName = FormatArtistCacheName(artistName);
lock (ArtistImageChanged)
{
if (ArtistImageChanged.ContainsKey(cacheName))
{
ArtistImageChanged[cacheName] += callback;
}
else
{
ArtistImageChanged.Add(cacheName, callback);
}
}
}
public static void RemoveHandler(string artistName, ArtistImageChangedEventHandler callback)
{
var cacheName = FormatArtistCacheName(artistName);
lock (ArtistImageChanged)
{
if (ArtistImageChanged.TryGetValue(cacheName, out var d))
{
d -= callback;
if (d == null)
{
ArtistImageChanged.Remove(cacheName);
}
else
{
ArtistImageChanged[cacheName] = d;
}
}
}
}
