diff --git a/Rx.NET/Source/src/System.Reactive/Concurrency/SchedulerOperation.cs b/Rx.NET/Source/src/System.Reactive/Concurrency/SchedulerOperation.cs
index 22404303c..24ab76a8d 100644
--- a/Rx.NET/Source/src/System.Reactive/Concurrency/SchedulerOperation.cs
+++ b/Rx.NET/Source/src/System.Reactive/Concurrency/SchedulerOperation.cs
@@ -151,9 +151,7 @@ private void Cancel()
             if (w != null)
                 w.Dispose();
 
-            var c = _continuation;
-            if (c != null)
-                c();
+            _continuation?.Invoke();
         }
     }
 }
\ No newline at end of file
diff --git a/Rx.NET/Source/src/System.Reactive/Disposables/AnonymousDisposable.cs b/Rx.NET/Source/src/System.Reactive/Disposables/AnonymousDisposable.cs
index 99b1e8237..0e0a1f5e8 100644
--- a/Rx.NET/Source/src/System.Reactive/Disposables/AnonymousDisposable.cs
+++ b/Rx.NET/Source/src/System.Reactive/Disposables/AnonymousDisposable.cs
@@ -37,11 +37,7 @@ public bool IsDisposed
         /// </summary>
         public void Dispose()
         {
-            var dispose = Interlocked.Exchange(ref _dispose, null);
-            if (dispose != null)
-            {
-                dispose();
-            }
+            Interlocked.Exchange(ref _dispose, null)?.Invoke();
         }
     }
 }
diff --git a/Rx.NET/Source/src/System.Reactive/Internal/HostLifecycleService.cs b/Rx.NET/Source/src/System.Reactive/Internal/HostLifecycleService.cs
index e6b2f1949..dc484e85a 100644
--- a/Rx.NET/Source/src/System.Reactive/Internal/HostLifecycleService.cs
+++ b/Rx.NET/Source/src/System.Reactive/Internal/HostLifecycleService.cs
@@ -62,16 +62,12 @@ public static void Release()
 
         private static void OnSuspending(object sender, HostSuspendingEventArgs e)
         {
-            var suspending = Suspending;
-            if (suspending != null)
-                suspending(sender, e);
+            Suspending?.Invoke(sender, e);
         }
 
         private static void OnResuming(object sender, HostResumingEventArgs e)
         {
-            var resuming = Resuming;
-            if (resuming != null)
-                resuming(sender, e);
+            Resuming?.Invoke(sender, e);
         }
 
         private static IHostLifecycleNotifications InitializeNotifications()
diff --git a/Rx.NET/Source/src/System.Reactive/Internal/SystemClock.Default.cs b/Rx.NET/Source/src/System.Reactive/Internal/SystemClock.Default.cs
index b8a433fe7..2c37a5cfd 100644
--- a/Rx.NET/Source/src/System.Reactive/Internal/SystemClock.Default.cs
+++ b/Rx.NET/Source/src/System.Reactive/Internal/SystemClock.Default.cs
@@ -100,9 +100,7 @@ private void TimeChanged()
             var diff = now - (_lastTime + _period);
             if (Math.Abs(diff.TotalMilliseconds) >= MAXERROR)
             {
-                var scc = _systemClockChanged;
-                if (scc != null)
-                    scc(this, new SystemClockChangedEventArgs(_lastTime + _period, now));
+                _systemClockChanged?.Invoke(this, new SystemClockChangedEventArgs(_lastTime + _period, now));
 
                 NewTimer();
             }
diff --git a/Rx.NET/Source/src/System.Reactive/Platforms/UWP/Foundation/AsyncInfoToObservableBridge.cs b/Rx.NET/Source/src/System.Reactive/Platforms/UWP/Foundation/AsyncInfoToObservableBridge.cs
index 58de5b01e..1104b0649 100644
--- a/Rx.NET/Source/src/System.Reactive/Platforms/UWP/Foundation/AsyncInfoToObservableBridge.cs
+++ b/Rx.NET/Source/src/System.Reactive/Platforms/UWP/Foundation/AsyncInfoToObservableBridge.cs
@@ -22,17 +22,14 @@ public AsyncInfoToObservableBridge(IAsyncInfo info, Action<IAsyncInfo, Action<IA
 
             _subject = new AsyncSubject<TResult>();
 
-            if (onProgress != null)
+            onProgress?.Invoke(info, (iai, p) =>
             {
-                onProgress(info, (iai, p) =>
-                {
-                    if (multiValue && getResult != null)
-                        _subject.OnNext(getResult(iai));
+                if (multiValue && getResult != null)
+                    _subject.OnNext(getResult(iai));
 
-                    if (progress != null)
-                        progress.Report(p);
-                });
-            }
+                if (progress != null)
+                    progress.Report(p);
+            });
 
             Done(info, info.Status, true);
         }