TaskFactory(Of TResult).FromAsync Method (IAsyncResult, Func(Of IAsyncResult, TResult), TaskCreationOptions, TaskScheduler)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Creates a task that executes an end method function when a specified IAsyncResult completes.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Function FromAsync ( _ asyncResult As IAsyncResult, _ endMethod As Func(Of IAsyncResult, TResult), _ creationOptions As TaskCreationOptions, _ scheduler As TaskScheduler _ ) As Task(Of TResult)
Parameters
- asyncResult
- Type: System.IAsyncResult
The IAsyncResult whose completion should trigger the processing of the endMethod.
- endMethod
- Type: System.Func(Of IAsyncResult, TResult)
The function delegate that processes the completed asyncResult.
- creationOptions
- Type: System.Threading.Tasks.TaskCreationOptions
One of the enumeration values that controls the behavior of the created task.
- scheduler
- Type: System.Threading.Tasks.TaskScheduler
The task scheduler that is used to schedule the task that executes the end method.
Return Value
Type: System.Threading.Tasks.Task(Of TResult)The created task that represents the asynchronous operation.
| Exception | Condition |
|---|---|
| ArgumentNullException | The asyncResult argument is Nothing. -or- The endMethod argument is Nothing. -or- The scheduler argument is Nothing. |
| ArgumentOutOfRangeException | The creationOptions parameter specifies an invalid value. |
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