通过

PreallocatedWorkItem 类

  • 参考

定义

命名空间:
Windows.System.Threading.Core
编辑

预先分配的工作项是在提交到线程池之前构造的，确保已构造工作项，以便在必要时将其提交到线程池。 例如，如果资源解除分配例程需要 PreallocatedWorkItem，则可以创建 PreallocatedWorkItem，因为在没有足够的资源可用于创建工作项的情况下，可能会调用资源解除分配例程。

注意

桌面应用和 UWP 应用支持 ThreadPool API。

public ref class PreallocatedWorkItem sealed
/// [Windows.Foundation.Metadata.Activatable(Windows.System.Threading.Core.IPreallocatedWorkItemFactory, 65536, Windows.Foundation.UniversalApiContract)]
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class PreallocatedWorkItem final
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
/// [Windows.Foundation.Metadata.Activatable(Windows.System.Threading.Core.IPreallocatedWorkItemFactory, 65536, "Windows.Foundation.UniversalApiContract")]
class PreallocatedWorkItem final
[Windows.Foundation.Metadata.Activatable(typeof(Windows.System.Threading.Core.IPreallocatedWorkItemFactory), 65536, typeof(Windows.Foundation.UniversalApiContract))]
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class PreallocatedWorkItem
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
[Windows.Foundation.Metadata.Activatable(typeof(Windows.System.Threading.Core.IPreallocatedWorkItemFactory), 65536, "Windows.Foundation.UniversalApiContract")]
public sealed class PreallocatedWorkItem
Public NotInheritable Class PreallocatedWorkItem
继承
Object Platform::Object IInspectable PreallocatedWorkItem
属性
ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Windows 要求

设备系列
Windows 10 (在 10.0.10240.0 中引入)
API contract
Windows.Foundation.UniversalApiContract (在 v1.0 中引入)

构造函数

PreallocatedWorkItem(WorkItemHandler)

使用 WorkItemHandler 委托初始化新的工作项，提前为工作项分配资源。
PreallocatedWorkItem(WorkItemHandler, WorkItemPriority)

使用 WorkItemHandler 委托初始化新的工作项，提前为工作项分配资源，并指定工作项相对于线程池中其他工作项的优先级。
PreallocatedWorkItem(WorkItemHandler, WorkItemPriority, WorkItemOptions)

使用 WorkItemHandler 委托初始化新的工作项，提前为工作项分配资源，并指定工作项相对于线程池中其他工作项的优先级。 还指定线程池如何为工作项分配处理器时间。

方法

RunAsync()

将预先分配的工作项提交到线程池，而无需分配任何其他资源。

适用于