TaskFactory(Of TResult).FromAsync Method (Func(Of AsyncCallback, Object, IAsyncResult), Func(Of IAsyncResult, TResult), Object, TaskCreationOptions)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Creates a task that represents a pair of begin and end methods that conform to the Asynchronous Programming Model pattern.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Function FromAsync ( _ beginMethod As Func(Of AsyncCallback, Object, IAsyncResult), _ endMethod As Func(Of IAsyncResult, TResult), _ state As Object, _ creationOptions As TaskCreationOptions _ ) As Task(Of TResult)
Parameters
- beginMethod
- Type: System.Func(Of AsyncCallback, Object, IAsyncResult)
The delegate that begins the asynchronous operation.
- endMethod
- Type: System.Func(Of IAsyncResult, TResult)
The delegate that ends the asynchronous operation.
- state
- Type: System.Object
An object containing data to be used by the beginMethod delegate.
- creationOptions
- Type: System.Threading.Tasks.TaskCreationOptions
One of the enumeration values that controls the behavior of the created task.
Return Value
Type: System.Threading.Tasks.Task(Of TResult)The created Task(Of TResult) that represents the asynchronous operation.
| Exception | Condition |
|---|---|
| ArgumentNullException | The beginMethod argument is Nothing. -or- The endMethod argument is Nothing. |
| ArgumentOutOfRangeException | The creationOptions argument specifies an invalid value. |
Show: