Metodo Qbservable.FromAsyncPattern<T1, TResult> (IQbservableProvider, Expression<Func<T1, AsyncCallback, Object, IAsyncResult>>, Expression<Func<IAsyncResult, TResult>>)

Converte una coppia di funzioni Begin/End invoke in una funzione asincrona.

Spazio dei nomi:System.Reactive.Linq
Assemblea: System.Reactive.Providers (in System.Reactive.Providers.dll)

Sintassi

'Declaration
<ExtensionAttribute> _
Public Shared Function FromAsyncPattern(Of T1, TResult) ( _
    provider As IQbservableProvider, _
    begin As Expression(Of Func(Of T1, AsyncCallback, Object, IAsyncResult)), _
    end As Expression(Of Func(Of IAsyncResult, TResult)) _
) As Func(Of T1, IQbservable(Of TResult))

'Usage
Dim provider As IQbservableProvider
Dim begin As Expression(Of Func(Of T1, AsyncCallback, Object, IAsyncResult))
Dim end As Expression(Of Func(Of IAsyncResult, TResult))
Dim returnValue As Func(Of T1, IQbservable(Of TResult))

returnValue = provider.FromAsyncPattern(begin, _
    end)

public static Func<T1, IQbservable<TResult>> FromAsyncPattern<T1, TResult>(
    this IQbservableProvider provider,
    Expression<Func<T1, AsyncCallback, Object, IAsyncResult>> begin,
    Expression<Func<IAsyncResult, TResult>> end
)

[ExtensionAttribute]
public:
generic<typename T1, typename TResult>
static Func<T1, IQbservable<TResult>^>^ FromAsyncPattern(
    IQbservableProvider^ provider, 
    Expression<Func<T1, AsyncCallback^, Object^, IAsyncResult^>^>^ begin, 
    Expression<Func<IAsyncResult^, TResult>^>^ end
)

static member FromAsyncPattern : 
        provider:IQbservableProvider * 
        begin:Expression<Func<'T1, AsyncCallback, Object, IAsyncResult>> * 
        end:Expression<Func<IAsyncResult, 'TResult>> -> Func<'T1, IQbservable<'TResult>> 

JScript does not support generic types and methods.

Parametri di tipo

• T1
  Primo tipo di funzione.

• TResult
  Tipo di risultato.

Parametri

• provider
  Tipo: System.Reactive.Linq.IQbservableProvider
  Provider Qbservable locale.

• begin
  Tipo: System.Linq.Expressions.Expression<Func<T1, AsyncCallback, Object, IAsyncResult>>
  Funzione begin invoke.

• end
  Tipo: System.Linq.Expressions.Expression<Func<IAsyncResult, TResult>>
  Funzione end invoke.

Valore restituito

Tipo: System.Func<T1, IQbservable<TResult>>
Funzione end invoke.

Nota sull'utilizzo

In Visual Basic e C# è possibile chiamare questo metodo come metodo di istanza su qualsiasi oggetto di tipo IQbservableProvider. Per chiamare il metodo usando la sintassi del metodo di istanza, omettere il primo parametro. Per altre informazioni, vedere o .

Vedere anche

Riferimento

Classe Qbservable

FromAsyncPattern Overload

Spazio dei nomi System.Reactive.Linq