Add Ignore() extension to ignore the results of a Task

Author: lukebakken

projects/RabbitMQ.Client/client/TaskExtensions.cs

@@ -39,7 +39,7 @@ internal static class TaskExtensions
     {
 #if !NET6_0_OR_GREATER
         private static readonly TaskContinuationOptions s_tco = TaskContinuationOptions.OnlyOnFaulted | TaskContinuationOptions.ExecuteSynchronously;
-        private static void continuation(Task t, object s) => t.Exception.Handle(e => true);
+        private static void IgnoreTaskContinuation(Task t, object s) => t.Exception.Handle(e => true);
 #endif
 
         public static Task TimeoutAfter(this Task task, TimeSpan timeout)
@@ -68,12 +68,7 @@ static async Task DoTimeoutAfter(Task task, TimeSpan timeout)
                     Task resultTask = await Task.WhenAny(task, delayTask).ConfigureAwait(false);
                     if (resultTask == delayTask)
                     {
-                        Task supressErrorTask = task.ContinueWith(
-                            continuationAction: continuation,
-                            state: null,
-                            cancellationToken: CancellationToken.None,
-                            continuationOptions: s_tco,
-                            scheduler: TaskScheduler.Default);
+                        task.Ignore();
                         throw new TimeoutException();
                     }
                     else
@@ -112,12 +107,7 @@ static async ValueTask DoTimeoutAfter(ValueTask valueTask, TimeSpan timeout)
                     Task resultTask = await Task.WhenAny(task, delayTask).ConfigureAwait(false);
                     if (resultTask == delayTask)
                     {
-                        Task supressErrorTask = task.ContinueWith(
-                            continuationAction: continuation,
-                            state: null,
-                            cancellationToken: CancellationToken.None,
-                            continuationOptions: s_tco,
-                            scheduler: TaskScheduler.Default);
+                        task.Ignore();
                         throw new TimeoutException();
                     }
                     else
@@ -155,5 +145,26 @@ public static void EnsureCompleted(this ValueTask task)
         {
             task.GetAwaiter().GetResult();
         }
+
+#if !NET6_0_OR_GREATER
+        // https://github.com/dotnet/runtime/issues/23878
+        // https://github.com/dotnet/runtime/issues/23878#issuecomment-1398958645
+        public static void Ignore(this Task task)
+        {
+            if (task.IsCompleted)
+            {
+                _ = task.Exception;
+            }
+            else
+            {
+                _ = task.ContinueWith(
+                    continuationAction: IgnoreTaskContinuation,
+                    state: null,
+                    cancellationToken: CancellationToken.None,
+                    continuationOptions: s_tco,
+                    scheduler: TaskScheduler.Default);
+            }
+        }
+#endif
     }
 }