Qbservable.FromEvent Method (IQbservableProvider, Expression<Action<Action>>, Expression<Action<Action>>)
Converts a .NET event to a queryable observable sequence.
Namespace: System.Reactive.Linq
Assembly: System.Reactive.Providers (in System.Reactive.Providers.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function FromEvent ( _
provider As IQbservableProvider, _
addHandler As Expression(Of Action(Of Action)), _
removeHandler As Expression(Of Action(Of Action)) _
) As IQbservable(Of Unit)
'Usage
Dim provider As IQbservableProvider
Dim addHandler As Expression(Of Action(Of Action))
Dim removeHandler As Expression(Of Action(Of Action))
Dim returnValue As IQbservable(Of Unit)
returnValue = provider.FromEvent(addHandler, _
removeHandler)
public static IQbservable<Unit> FromEvent(
this IQbservableProvider provider,
Expression<Action<Action>> addHandler,
Expression<Action<Action>> removeHandler
)
[ExtensionAttribute]
public:
static IQbservable<Unit>^ FromEvent(
IQbservableProvider^ provider,
Expression<Action<Action^>^>^ addHandler,
Expression<Action<Action^>^>^ removeHandler
)
static member FromEvent :
provider:IQbservableProvider *
addHandler:Expression<Action<Action>> *
removeHandler:Expression<Action<Action>> -> IQbservable<Unit>
public static function FromEvent(
provider : IQbservableProvider,
addHandler : Expression<Action<Action>>,
removeHandler : Expression<Action<Action>>
) : IQbservable<Unit>
Parameters
- provider
Type: System.Reactive.Linq.IQbservableProvider
The local Qbservable provider.
- addHandler
Type: System.Linq.Expressions.Expression<Action<Action>>
Action that attaches the given event handler to the underlying .NET event.
- removeHandler
Type: System.Linq.Expressions.Expression<Action<Action>>
Action that detaches the given event handler from the underlying .NET event.
Return Value
Type: System.Reactive.Linq.IQbservable<Unit>
Observable sequence that contains data representations of invocations of the underlying .NET event.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservableProvider. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .