TaskFactory::FromAsync Method (IAsyncResult^, Action<IAsyncResult^>^, TaskCreationOptions, TaskScheduler^)
Creates a Task that executes an end method action when a specified IAsyncResult completes.
Assembly: mscorlib (in mscorlib.dll)
public:
Task^ FromAsync(
IAsyncResult^ asyncResult,
Action<IAsyncResult^>^ endMethod,
TaskCreationOptions creationOptions,
TaskScheduler^ scheduler
)
Parameters
- asyncResult
-
Type:
System::IAsyncResult^
The IAsyncResult whose completion should trigger the processing of the endMethod.
- endMethod
-
Type:
System::Action<IAsyncResult^>^
The action delegate that processes the completed asyncResult.
- creationOptions
-
Type:
System.Threading.Tasks::TaskCreationOptions
The TaskCreationOptions value that controls the behavior of the created Task.
- scheduler
-
Type:
System.Threading.Tasks::TaskScheduler^
The TaskScheduler that is used to schedule the task that executes the end method.
Return Value
Type: System.Threading.Tasks::Task^The created Task that represents the asynchronous operation.
| Exception | Condition |
|---|---|
| ArgumentNullException | The exception that is thrown when the asyncResult argument is null. -or- The exception that is thrown when the endMethod argument is null. -or- The exception that is thrown when the scheduler argument is null. |
| ArgumentOutOfRangeException | The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. For more information, see the Remarks for FromAsync |
 Tip |
|---|
The FromAsync overloads that take an asyncResult parameter are not as efficient as the overloads that take a beginMethod parameter. If performance is an issue, use the overloads that provide the beginMethod/endMethod pattern. |
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 5.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1