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Qbservable.FromEventPattern(Of TEventArgs) Method (IQbservableProvider, Expression(Of Action(Of EventHandler(Of TEventArgs))), Expression(Of Action(Of EventHandler(Of TEventArgs))))

Converts a .NET event, conforming to the standard .NET event pattern, to an queryable observable sequence with the specified add handler and remove handler.

Namespace:  System.Reactive.Linq
Assembly:  System.Reactive.Providers (in System.Reactive.Providers.dll)

'Declaration
<ExtensionAttribute> _
Public Shared Function FromEventPattern(Of TEventArgs As EventArgs) ( _
	provider As IQbservableProvider, _
	addHandler As Expression(Of Action(Of EventHandler(Of TEventArgs))), _
	removeHandler As Expression(Of Action(Of EventHandler(Of TEventArgs))) _
) As IQbservable(Of EventPattern(Of TEventArgs))
'Usage
Dim provider As IQbservableProvider
Dim addHandler As Expression(Of Action(Of EventHandler(Of TEventArgs)))
Dim removeHandler As Expression(Of Action(Of EventHandler(Of TEventArgs)))
Dim returnValue As IQbservable(Of EventPattern(Of TEventArgs))

returnValue = provider.FromEventPattern(addHandler, _
	removeHandler)

Type Parameters

TEventArgs

The type for the event.

Parameters

provider
Type: System.Reactive.Linq.IQbservableProvider
The local Qbservable provider.
addHandler
Type: System.Linq.Expressions.Expression(Of Action(Of EventHandler(Of TEventArgs)))
The action that attaches the given event handler to the underlying .NET event.
removeHandler
Type: System.Linq.Expressions.Expression(Of Action(Of EventHandler(Of TEventArgs)))
The action that detaches the given event handler from the underlying .NET event.

Return Value

Type: System.Reactive.Linq.IQbservable(Of EventPattern(Of TEventArgs))
The queryable 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 https://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or https://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.
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