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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.task.delay below:

Task.Delay Method (System.Threading.Tasks) | Microsoft Learn

Source:

Task.cs

Source:

Task.cs

Source:

Task.cs

Source:

Task.cs

Creates a cancellable task that completes after a specified time interval.

public:
 static System::Threading::Tasks::Task ^ Delay(TimeSpan delay, System::Threading::CancellationToken cancellationToken);

public static System.Threading.Tasks.Task Delay(TimeSpan delay, System.Threading.CancellationToken cancellationToken);

static member Delay : TimeSpan * System.Threading.CancellationToken -> System.Threading.Tasks.Task

Public Shared Function Delay (delay As TimeSpan, cancellationToken As CancellationToken) As Task

delay

TimeSpan

The time span to wait before completing the returned task, or Timeout.InfiniteTimeSpan to wait indefinitely.

cancellationToken

CancellationToken

A cancellation token to observe while waiting for the task to complete.

A task that represents the time delay.

delay represents a negative time interval other than Timeout.InfiniteTimeSpan.

-or-

The delay argument's TotalMilliseconds property is greater than 4294967294 on .NET 6 and later versions, or Int32.MaxValue on all previous versions.

The task has been canceled. This exception is stored into the returned task.

The provided cancellationToken has already been disposed.

The task has been canceled.

The following example launches a task that includes a call to the Delay(TimeSpan, CancellationToken) method with a 1.5 second delay. Before the delay interval elapses, the token is cancelled. The output from the example shows that, as a result, a TaskCanceledException is thrown, and the tasks' Status property is set to Canceled.

using System;
using System.Threading;
using System.Threading.Tasks;

public class Example
{
   public static void Main()
   {
      CancellationTokenSource source = new CancellationTokenSource();

      var t = Task.Run(async delegate
              {
                 await Task.Delay(TimeSpan.FromSeconds(1.5), source.Token);
                 return 42;
              });
      source.Cancel();
      try {
         t.Wait();
      }
      catch (AggregateException ae) {
         foreach (var e in ae.InnerExceptions)
            Console.WriteLine("{0}: {1}", e.GetType().Name, e.Message);
      }
      Console.Write("Task t Status: {0}", t.Status);
      if (t.Status == TaskStatus.RanToCompletion)
         Console.Write(", Result: {0}", t.Result);
      source.Dispose();
   }
}
// The example displays output like the following:
//       TaskCanceledException: A task was canceled.
//       Task t Status: Canceled

open System
open System.Threading
open System.Threading.Tasks

let source = new CancellationTokenSource()

let t =
    Task.Run<int>(fun () ->
        task {

            do! Task.Delay(TimeSpan.FromSeconds(1.5), source.Token)
            return 42
        })

source.Cancel()

try
    t.Wait()

with :? AggregateException as ae ->
    for e in ae.InnerExceptions do
        printfn $"{e.GetType().Name}: {e.Message}"

printf $"Task t Status: {t.Status}"

if t.Status = TaskStatus.RanToCompletion then
    printf $", Result: {t.Result}"

source.Dispose()

// The example displays output like the following:
//       TaskCanceledException: A task was canceled.
//       Task t Status: Canceled

Imports System.Threading
Imports System.Threading.Tasks

Module Example
   Public Sub Main()
      Dim source As New CancellationTokenSource()
      
      Dim t = Task.Run(Async Function()
                                Await Task.Delay(TimeSpan.FromSeconds(1.5),
                                                 source.Token)
                                Return 42
                       End Function)
      source.Cancel()
      Try
         t.Wait()
      Catch ae As AggregateException
         For Each e In ae.InnerExceptions
            Console.WriteLine("{0}: {1}", e.GetType().Name, e.Message)
         Next
      End Try
      Console.Write("Task t Status: {0}", t.Status)
      If t.Status = TaskStatus.RanToCompletion Then
         Console.Write(", Result: {0}", t.Result)
      End If
      source.Dispose()
   End Sub
End Module
' The example displays output like the following:
'       TaskCanceledException: A task was canceled.
'       Task t Status: Canceled

Note that this example includes a potential race condition: it depends on the task asynchronously executing the delay when the token is cancelled. Although the 1.5 second delay from the call to the Delay(TimeSpan, CancellationToken) method makes that assumption likely, it is nevertheless possible that the call to the Delay(TimeSpan, CancellationToken) method could return before the token is cancelled. In that case, the example produces the following output:

Task t Status: RanToCompletion, Result: 42

If the cancellation token is signaled before the specified time delay, a TaskCanceledException exception results, and the task is completed in the Canceled state. Otherwise, the task is completed in the RanToCompletion state once the specified time delay has elapsed.

For usage scenarios and additional examples, see the documentation for the Delay(Int32) overload.

This method depends on the system clock. This means that the time delay will approximately equal the resolution of the system clock if the delay argument is less than the resolution of the system clock, which is approximately 15 milliseconds on Windows systems.

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