})} },System.Boolean)} },System.Boolean,System.Boolean)} },System.Boolean,System.Boolean,System.Boolean)} },System.Func{--1,--2})} },System.Func{--1,--2},System.Boolean)}

ReactiveNotifyPropertyChangedMixin.ObservableForProperty(TSender?, string, bool, bool, bool) method¶

Defined in

Type: ReactiveNotifyPropertyChangedMixin Namespace: ReactiveUI Assembly: ReactiveUI.dll

Applies to

net10.0, net10.0-android36.0, net10.0-ios26.0, net10.0-macos26.0, net10.0-windows10.0.19041, net10.0-tvos26.0, net10.0-maccatalyst26.0, net10.0-desktop1.0, net10.0-browserwasm1.0, net9.0, net9.0-tvos18.0, net9.0-maccatalyst18.0, net9.0-windows10.0.19041, net9.0-desktop1.0, net9.0-browserwasm1.0, net9.0-macos15.0, net9.0-ios18.0, net9.0-android35.0, net8.0, net8.0-macos14.5, net8.0-macos14.2, net8.0-maccatalyst17.5, net8.0-ios17.5, net8.0-tvos18.0, net8.0-macos15.0, net8.0-ios18.0, net8.0-windows10.0.19041, net8.0-maccatalyst18.0, net8.0-tvos17.2, netstandard2.1, net481, net462

Overloads¶

1. public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, string propertyName, bool beforeChange, bool skipInitial, bool isDistinct)
2. public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, string propertyName)
3. public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, string propertyName, bool beforeChange)
4. public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, string propertyName, bool beforeChange, bool skipInitial)
5. public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, Expression<Func<TSender, TValue>> property)
6. public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, Expression<Func<TSender, TValue>> property, bool beforeChange)
7. public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, Expression<Func<TSender, TValue>> property, bool beforeChange, bool skipInitial)
8. public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, Expression<Func<TSender, TValue>> property, bool beforeChange, bool skipInitial, bool isDistinct)
9. public static IObservable<TRet> ObservableForProperty<TSender, TValue, TRet>(this TSender? item, Expression<Func<TSender, TValue>> property, Func<TValue?, TRet> selector) where TSender : class
10. public static IObservable<TRet> ObservableForProperty<TSender, TValue, TRet>(this TSender? item, Expression<Func<TSender, TValue>> property, Func<TValue?, TRet> selector, bool beforeChange) where TSender : class

1. Overload¶

Attributes: [RequiresUnreferencedCode("Creating Expressions requires unreferenced code because the members being referenced by the Expression may be trimmed.")]

public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, string propertyName, bool beforeChange, bool skipInitial, bool isDistinct)

View source

Summary: ObservableForProperty returns an Observable representing the property change notifications for a specific property name on a ReactiveObject (or compatible type). This overload avoids expression tree analysis to be more AOT-friendly. The returned IObservedChange instances will always have the Value property populated via reflection.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`propertyName`	string	The property name to observe.
`beforeChange`	bool	If true, the Observable will notify immediately before a property is going to change.
`skipInitial`	bool	If true, the Observable will not notify with the initial value.
`isDistinct`	bool	If set to `true`, values are filtered with DistinctUntilChanged.

Returns: IObservable> -- An Observable representing the property change notifications for the given property name.

2. Overload¶

Attributes: [RequiresUnreferencedCode("Creating Expressions requires unreferenced code because the members being referenced by the Expression may be trimmed.")]

public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, string propertyName)

View source

Summary: ObservableForProperty overload that avoids expression trees by using only a property name.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`propertyName`	string	The property name to observe.

Returns: IObservable> -- An observable sequence of observed changes for the given property name.

3. Overload¶

Attributes: [RequiresUnreferencedCode("Creating Expressions requires unreferenced code because the members being referenced by the Expression may be trimmed.")]

public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, string propertyName, bool beforeChange)

View source

Summary: ObservableForProperty overload that avoids expression trees by using a property name and beforeChange option.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`propertyName`	string	The property name to observe.
`beforeChange`	bool	If true, the observable will notify immediately before a property is going to change.

Returns: IObservable> -- An observable sequence of observed changes for the given property name.

4. Overload¶

Attributes: [RequiresUnreferencedCode("Creating Expressions requires unreferenced code because the members being referenced by the Expression may be trimmed.")]

public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, string propertyName, bool beforeChange, bool skipInitial)

View source

Summary: ObservableForProperty overload that avoids expression trees by using a property name with options to control initial emission and beforeChange.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`propertyName`	string	The property name to observe.
`beforeChange`	bool	If true, the observable will notify immediately before a property is going to change.
`skipInitial`	bool	If true, the observable will not notify with the initial value.

Returns: IObservable> -- An observable sequence of observed changes for the given property name.

5. Overload¶

Attributes: [RequiresUnreferencedCode("Evaluates expression-based member chains via reflection; members may be trimmed.")]

public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, Expression<Func<TSender, TValue>> property)

View source

Summary: ObservableForProperty returns an Observable representing the property change notifications for a specific property on a ReactiveObject. This method (unlike other Observables that return IObservedChange) guarantees that the Value property of the IObservedChange is set.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`property`	Expression>	An Expression representing the property (i.e. 'x => x.SomeProperty.SomeOtherProperty'.

Returns: IObservable> -- An Observable representing the property change notifications for the given property.

6. Overload¶

Attributes: [RequiresUnreferencedCode("Evaluates expression-based member chains via reflection; members may be trimmed.")]

public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, Expression<Func<TSender, TValue>> property, bool beforeChange)

View source

Summary: ObservableForProperty returns an Observable representing the property change notifications for a specific property on a ReactiveObject. This method (unlike other Observables that return IObservedChange) guarantees that the Value property of the IObservedChange is set.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`property`	Expression>	An Expression representing the property (i.e. 'x => x.SomeProperty.SomeOtherProperty'.
`beforeChange`	bool	If True, the Observable will notify immediately before a property is going to change.

Returns: IObservable> -- An Observable representing the property change notifications for the given property.

7. Overload¶

Attributes: [RequiresUnreferencedCode("Evaluates expression-based member chains via reflection; members may be trimmed.")]

public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, Expression<Func<TSender, TValue>> property, bool beforeChange, bool skipInitial)

View source

Summary: ObservableForProperty returns an Observable representing the property change notifications for a specific property on a ReactiveObject. This method (unlike other Observables that return IObservedChange) guarantees that the Value property of the IObservedChange is set.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`property`	Expression>	An Expression representing the property (i.e. 'x => x.SomeProperty.SomeOtherProperty'.
`beforeChange`	bool	If True, the Observable will notify immediately before a property is going to change.
`skipInitial`	bool	If true, the Observable will not notify with the initial value.

Returns: IObservable> -- An Observable representing the property change notifications for the given property.

8. Overload¶

Attributes: [RequiresUnreferencedCode("Evaluates expression-based member chains via reflection; members may be trimmed.")]

public static IObservable<IObservedChange<TSender, TValue>> ObservableForProperty<TSender, TValue>(this TSender? item, Expression<Func<TSender, TValue>> property, bool beforeChange, bool skipInitial, bool isDistinct)

View source

Summary: ObservableForProperty returns an Observable representing the property change notifications for a specific property on a ReactiveObject. This method (unlike other Observables that return IObservedChange) guarantees that the Value property of the IObservedChange is set.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`property`	Expression>	An Expression representing the property (i.e. 'x => x.SomeProperty.SomeOtherProperty'.
`beforeChange`	bool	If True, the Observable will notify immediately before a property is going to change.
`skipInitial`	bool	If true, the Observable will not notify with the initial value.
`isDistinct`	bool	if set to `true` [is distinct].

Returns: IObservable> -- An Observable representing the property change notifications for the given property.

9. Overload¶

Attributes: [RequiresUnreferencedCode("Evaluates expression-based member chains via reflection; members may be trimmed.")]

public static IObservable<TRet> ObservableForProperty<TSender, TValue, TRet>(this TSender? item, Expression<Func<TSender, TValue>> property, Func<TValue?, TRet> selector) where TSender : class

View source

Summary: ObservableForProperty returns an Observable representing the property change notifications for a specific property on a ReactiveObject, running the IObservedChange through a Selector function.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.
`TRet`	The return value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`property`	Expression>	An Expression representing the property (i.e. 'x => x.SomeProperty'.
`selector`	Func	A Select function that will be run on each item.

Returns: IObservable -- An Observable representing the property change notifications for the given property.

10. Overload¶

Attributes: [RequiresUnreferencedCode("Evaluates expression-based member chains via reflection; members may be trimmed.")]

public static IObservable<TRet> ObservableForProperty<TSender, TValue, TRet>(this TSender? item, Expression<Func<TSender, TValue>> property, Func<TValue?, TRet> selector, bool beforeChange) where TSender : class

View source

Summary: ObservableForProperty returns an Observable representing the property change notifications for a specific property on a ReactiveObject, running the IObservedChange through a Selector function.

Type parameters

Name	Description
`TSender`	The sender type.
`TValue`	The value type.
`TRet`	The return value type.

Parameters

Name	Type	Description
`item`	`TSender?`	The source object to observe properties of.
`property`	Expression>	An Expression representing the property (i.e. 'x => x.SomeProperty'.
`selector`	Func	A Select function that will be run on each item.
`beforeChange`	bool	If True, the Observable will notify immediately before a property is going to change.

Returns: IObservable -- An Observable representing the property change notifications for the given property.