,System.Action{System.EventHandler})} },System.Action{System.EventHandler{--1}})}

ObservableForPropertyBase.ObservableFromEvent(NSObject, Expression, string) method¶

Defined in

Type: ObservableForPropertyBase Namespace: ReactiveUI.Reactive Assembly: ReactiveUI.Reactive.dll

Applies to

net10.0-ios26.0, net10.0-macos26.0, net10.0-maccatalyst26.0, net10.0-tvos26.0

Overloads¶

1. protected static IObservable<IObservedChange<object, object?>> ObservableFromEvent(NSObject sender, Expression expression, string eventName)
2. protected static IObservable<IObservedChange<object, object?>> ObservableFromEvent<TSender>(TSender sender, Expression expression, Action<EventHandler> addHandler, Action<EventHandler> removeHandler) where TSender : NSObject
3. protected static IObservable<IObservedChange<object, object?>> ObservableFromEvent<TSender, TEventArgs>(TSender sender, Expression expression, Action<EventHandler<TEventArgs>> addHandler, Action<EventHandler<TEventArgs>> removeHandler) where TSender : NSObject where TEventArgs : EventArgs

1. Overload¶

Attributes: [RequiresUnreferencedCode("String-based event hookup uses reflection over members that may be trimmed.")] [RequiresDynamicCode("String-based event hookup may require runtime code generation and is not guaranteed to be AOT-compatible.")]

protected static IObservable<IObservedChange<object, object?>> ObservableFromEvent(NSObject sender, Expression expression, string eventName)

View source

Summary: Creates an observable sequence from an event using reflection-based string event lookup.

Parameters

Name	Type	Description
`sender`	`NSObject`	The native sender.
`expression`	Expression	The expression associated with the observed change.
`eventName`	string	The event name.

Returns: IObservable> -- An observable sequence of observed changes.

Remarks

Prefer the add/remove overloads (for example, ObservableFromEvent) for trimming/AOT compatibility.

2. Overload¶

protected static IObservable<IObservedChange<object, object?>> ObservableFromEvent<TSender>(TSender sender, Expression expression, Action<EventHandler> addHandler, Action<EventHandler> removeHandler) where TSender : NSObject

View source

Summary: Creates an observable sequence from an event using explicit add/remove handlers (non-reflection).

Type parameters

Name	Description
`TSender`	The sender type.

Parameters

Name	Type	Description
`sender`	`TSender`	The sender instance.
`expression`	Expression	The expression associated with the observed change.
`addHandler`	Action	Adds the handler to the event source.
`removeHandler`	Action	Removes the handler from the event source.

Returns: IObservable> -- An observable sequence of observed changes.

3. Overload¶

protected static IObservable<IObservedChange<object, object?>> ObservableFromEvent<TSender, TEventArgs>(TSender sender, Expression expression, Action<EventHandler<TEventArgs>> addHandler, Action<EventHandler<TEventArgs>> removeHandler) where TSender : NSObject where TEventArgs : EventArgs

View source

Summary: Creates an observable sequence from a typed event using explicit add/remove handlers (non-reflection).

Type parameters

Name	Description
`TSender`	The sender type.
`TEventArgs`	The event args type.

Parameters

Name	Type	Description
`sender`	`TSender`	The sender instance.
`expression`	Expression	The expression associated with the observed change.
`addHandler`	Action>	Adds the handler to the event source.
`removeHandler`	Action>	Removes the handler from the event source.

Returns: IObservable> -- An observable sequence of observed changes.