99_listeners = new TraceListenerCollection();

105Debug.Assert(_listeners != null); 106_listeners.Add(new DefaultTraceListener()); 113if (_listeners != null) 118foreach (TraceListener? listener in _listeners) 129if (_listeners != null) 135foreach (TraceListener? listener in _listeners) 143foreach (TraceListener? listener in _listeners) 194if (_internalSwitch!.ShouldTrace(eventType) && _listeners != null) 203for (int i = 0; i < _listeners.Count; i++) 205TraceListener listener = _listeners[i]; 213for (int i = 0; i < _listeners.Count; i++) 215TraceListener listener = _listeners[i]; 239if (_internalSwitch!.ShouldTrace(eventType) && _listeners != null) 248for (int i = 0; i < _listeners.Count; i++) 250TraceListener listener = _listeners[i]; 258for (int i = 0; i < _listeners.Count; i++) 260TraceListener listener = _listeners[i]; 284if (_internalSwitch!.ShouldTrace(eventType) && _listeners != null) 293for (int i = 0; i < _listeners.Count; i++) 295TraceListener listener = _listeners[i]; 303for (int i = 0; i < _listeners.Count; i++) 305TraceListener listener = _listeners[i]; 329if (_internalSwitch!.ShouldTrace(eventType) && _listeners != null) 338for (int i = 0; i < _listeners.Count; i++) 340TraceListener listener = _listeners[i]; 348for (int i = 0; i < _listeners.Count; i++) 350TraceListener listener = _listeners[i]; 374if (_internalSwitch!.ShouldTrace(eventType) && _listeners != null) 383for (int i = 0; i < _listeners.Count; i++) 385TraceListener listener = _listeners[i]; 393for (int i = 0; i < _listeners.Count; i++) 395TraceListener listener = _listeners[i]; 436if (_internalSwitch!.ShouldTrace(TraceEventType.Transfer) && _listeners != null) 443for (int i = 0; i < _listeners.Count; i++) 445TraceListener listener = _listeners[i]; 457for (int i = 0; i < _listeners.Count; i++) 459TraceListener listener = _listeners[i]; 546return _listeners!;