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HostingEnvironment.QueueBackgroundWorkItem Method
Definition
- Namespace:
- System.Web.Hosting
- Assembly:
- System.Web.dll
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Schedules a task which can run in the background, independent of any request.
This overloaded method doesn't flow the ExecutionContext or SecurityContext from the caller to the callee. Therefore, members of those objects, such as the CurrentPrincipal property, will not flow from the caller to the callee.
Overloads
| Name | Description |
|---|---|
| QueueBackgroundWorkItem(Action<CancellationToken>) |
Schedules a task which can run in the background, independent of any request. |
| QueueBackgroundWorkItem(Func<CancellationToken,Task>) |
Schedules a task which can run in the background, independent of any request. |
QueueBackgroundWorkItem(Action<CancellationToken>)
Schedules a task which can run in the background, independent of any request.
public:
static void QueueBackgroundWorkItem(Action<System::Threading::CancellationToken> ^ workItem);public static void QueueBackgroundWorkItem(Action<System.Threading.CancellationToken> workItem);static member QueueBackgroundWorkItem : Action<System.Threading.CancellationToken> -> unitPublic Shared Sub QueueBackgroundWorkItem (workItem As Action(Of CancellationToken))Parameters
- workItem
- Action<CancellationToken>
A unit of execution.
Remarks
Differs from a normal ThreadPool work item in that ASP.NET can keep track of how many work items registered through this API are currently running, and the ASP.NET runtime will try to delay AppDomain shutdown until these work items have finished executing. This API cannot be called outside of an ASP.NET-managed AppDomain. The provided CancellationToken will be signaled when the application is shutting down.
QueueBackgroundWorkItem takes a Task-returning callback; the work item will be considered finished when the callback returns.
Applies to
QueueBackgroundWorkItem(Func<CancellationToken,Task>)
Schedules a task which can run in the background, independent of any request.
public:
static void QueueBackgroundWorkItem(Func<System::Threading::CancellationToken, System::Threading::Tasks::Task ^> ^ workItem);public static void QueueBackgroundWorkItem(Func<System.Threading.CancellationToken,System.Threading.Tasks.Task> workItem);static member QueueBackgroundWorkItem : Func<System.Threading.CancellationToken, System.Threading.Tasks.Task> -> unitPublic Shared Sub QueueBackgroundWorkItem (workItem As Func(Of CancellationToken, Task))Parameters
- workItem
- Func<CancellationToken,Task>
A unit of execution.
Remarks
Differs from a normal ThreadPool work item in that ASP.NET can keep track of how many work items registered through this API are currently running, and the ASP.NET runtime will try to delay AppDomain shutdown until these work items have finished executing. This API cannot be called outside of an ASP.NET-managed AppDomain. The provided CancellationToken will be signaled when the application is shutting down.
QueueBackgroundWorkItem takes a Task-returning callback; the work item will be considered finished when the returned Task transitions to a terminal state.
Applies to
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