public override DependencySnapshot Snapshot(bool useFallbacks)
{
if (SnapshotReady)
{
return(_snapshot);
}
var builder = ImmutableDictionary.CreateBuilder <Type, StackedDependency>();
builder.AddRange(enumerateDependencies());
IEnumerable <KeyValuePair <Type, StackedDependency> > enumerateDependencies()
{
foreach (var kvp in _dependencyStacks)
{
if (kvp.Value.Count != 0)
{
yield return(new KeyValuePair <Type, StackedDependency>(
kvp.Key,
kvp.Value.Peek().RunOnSnapshot()
));
}
}
}
var fb = this.Fallback;
while (useFallbacks && fb != null)
{
DependencyLayer.AddAsFallbackToSnapshot(fb, builder);
fb = fb.Fallback;
}
return(_snapshot = new DependencySnapshot(builder.ToImmutable()));
}
private void markSnapshotDirty() => _snapshot = DependencySnapshot.Null;