Fix IDE1005 (simplify delegate invocation)

src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/EventSource.cs

@@ -2782,9 +2782,7 @@ internal void DoCommand(EventCommandEventArgs commandArgs)
  }
 
  this.OnEventCommand(commandArgs);
- var eventCommandCallback = this.m_eventCommandExecuted;
- if (eventCommandCallback != null)
- eventCommandCallback(this, commandArgs);
+ this.m_eventCommandExecuted?.Invoke(this, commandArgs);
 
  if (!commandArgs.enable)
  {
@@ -2835,9 +2833,7 @@ internal void DoCommand(EventCommandEventArgs commandArgs)
  // Debug.Assert(matchAnyKeyword == EventKeywords.None);
 
  this.OnEventCommand(commandArgs);
- var eventCommandCallback = m_eventCommandExecuted;
- if (eventCommandCallback != null)
- eventCommandCallback(this, commandArgs);
+ m_eventCommandExecuted?.Invoke(this, commandArgs);
  }
  }
  catch (Exception e)
@@ -4255,11 +4251,7 @@ protected internal virtual void OnEventSourceCreated(EventSource eventSource)
  /// <param name="eventData"></param>
  protected internal virtual void OnEventWritten(EventWrittenEventArgs eventData)
  {
- EventHandler<EventWrittenEventArgs>? callBack = this.EventWritten;
- if (callBack != null)
- {
- callBack(this, eventData);
- }
+ this.EventWritten?.Invoke(this, eventData);
  }
 
 

src/System.Private.CoreLib/shared/System/IO/Stream.cs

@@ -829,10 +829,7 @@ internal IAsyncResult BlockingBeginRead(byte[] buffer, int offset, int count, As
  asyncResult = new SynchronousAsyncResult(ex, state, isWrite: false);
  }
 
- if (callback != null)
- {
- callback(asyncResult);
- }
+ callback?.Invoke(asyncResult);
 
  return asyncResult;
  }
@@ -861,10 +858,7 @@ internal IAsyncResult BlockingBeginWrite(byte[] buffer, int offset, int count, A
  asyncResult = new SynchronousAsyncResult(ex, state, isWrite: true);
  }
 
- if (callback != null)
- {
- callback(asyncResult);
- }
+ callback?.Invoke(asyncResult);
 
  return asyncResult;
  }

src/System.Private.CoreLib/shared/System/Progress.cs

@@ -88,8 +88,8 @@ private void InvokeHandlers(object? state)
  Action<T>? handler = _handler;
  EventHandler<T>? changedEvent = ProgressChanged;
 
- if (handler != null) handler(value);
- if (changedEvent != null) changedEvent(this, value);
+ handler?.Invoke(value);
+ changedEvent?.Invoke(this, value);
  }
  }