static AssemblyName GetAssemblyName(Assembly assembly)
{
object key = assembly.IsDynamic ? (object)new WeakRefKey(assembly) : assembly;
lock (syncObject)
{
AssemblyName result;
if (_assemblies == null)
{
_assemblies = new Dictionary <object, AssemblyName>();
}
else
{
if (_assemblies.TryGetValue(key, out result))
{
return(result);
}
}
//
// We use AssemblyName ctor here because GetName demands FileIOPermission
// and does load more than just the required information.
// Essentially we use AssemblyName just to help parsing the name, version, culture
// and public key token from the assembly's name.
//
result = new AssemblyName(assembly.FullName);
_assemblies.Add(key, result);
if (assembly.IsDynamic && !_isGCCallbackPending)
{
// Make sure we clean up the cache if/when this dynamic assembly is GCed
GCNotificationToken.RegisterCallback(_cleanupCollectedAssemblies, null);
_isGCCallbackPending = true;
}
return(result);
}
}
// After a GC, clean up the weakrefs to any collected dynamic assemblies
static void CleanupCollectedAssemblies(object state) // dummy parameter required by WaitCallback definition
{
bool foundLiveDynamicAssemblies = false;
List <object> keysToRemove = null;
lock (syncObject)
{
foreach (object key in _assemblies.Keys)
{
WeakReference weakRef = key as WeakReference;
if (weakRef == null)
{
continue;
}
if (weakRef.IsAlive)
{
// There is a weak ref that is still alive, register another GC callback for next time
foundLiveDynamicAssemblies = true;
}
else
{
// The target has been collected, add it to our list of keys to remove
if (keysToRemove == null)
{
keysToRemove = new List <object>();
}
keysToRemove.Add(key);
}
}
if (keysToRemove != null)
{
foreach (object key in keysToRemove)
{
_assemblies.Remove(key);
}
}
if (foundLiveDynamicAssemblies)
{
GCNotificationToken.RegisterCallback(_cleanupCollectedAssemblies, null);
}
else
{
_isGCCallbackPending = false;
}
}
}
private static void CleanupCollectedAssemblies(object state)
{
bool flag = false;
List <object> list = null;
lock (syncObject) {
foreach (object key in _assemblies.Keys)
{
WeakReference weakReference = key as WeakReference;
if (weakReference != null)
{
if (weakReference.IsAlive)
{
flag = true;
}
else
{
if (list == null)
{
list = new List <object>();
}
list.Add(key);
}
}
}
if (list != null)
{
foreach (object item in list)
{
_assemblies.Remove(item);
}
}
if (flag)
{
GCNotificationToken.RegisterCallback(_cleanupCollectedAssemblies, null);
}
else
{
_isGCCallbackPending = false;
}
}
}
private static AssemblyName GetAssemblyName(Assembly assembly)
{
object key = assembly.IsDynamic ? ((ISerializable) new WeakRefKey(assembly)) : ((ISerializable)assembly);
lock (syncObject) {
AssemblyName value;
if (_assemblies == null)
{
_assemblies = new Dictionary <object, AssemblyName>();
}
else if (_assemblies.TryGetValue(key, out value))
{
return(value);
}
value = new AssemblyName(assembly.FullName);
_assemblies.Add(key, value);
if (assembly.IsDynamic && !_isGCCallbackPending)
{
GCNotificationToken.RegisterCallback(_cleanupCollectedAssemblies, null);
_isGCCallbackPending = true;
}
return(value);
}
}
