Task.Delay Method (TimeSpan)

.NET Framework 4.5

Creates a task that completes after a specified time interval.

Namespace:  System.Threading.Tasks
Assembly:  mscorlib (in mscorlib.dll)

public static Task Delay(
	TimeSpan delay


Type: System.TimeSpan

The time span to wait before completing the returned task, or TimeSpan.FromMilliseconds(-1) to wait indefinitely.

Return Value

Type: System.Threading.Tasks.Task
A task that represents the time delay.


delay represents a negative time interval other than TimeSpan.FromMillseconds(-1).


The delay argument's TotalMilliseconds property is greater than Int32.MaxValue.

After the specified time delay, the task is completed in TaskStatus.RanToCompletion state.

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.

The following example shows a simple use of the Delay method.

using System;
using System.Threading.Tasks;

public class Example
   public static void Main()
      var t = Task.Run(async delegate
                 await Task.Delay(TimeSpan.FromSeconds(1.5));
                 return 42;
      Console.WriteLine("Task t Status: {0}, Result: {1}",
                        t.Status, t.Result);
// The example displays the following output: 
//        Task t Status: RanToCompletion, Result: 42

.NET Framework

Supported in: 4.6, 4.5

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
© 2015 Microsoft