},System.IObservable{--0})} },System.IObservable{--0},System.IObservable{--0})} },System.IObservable{--0},System.Reactive.Concurrency.IScheduler)}

Qbservable.If(IQbservableProvider, Expression>, IObservable) method¶

Defined in

Type: Qbservable Namespace: System.Reactive.Linq Assembly: System.Reactive.dll

Applies to

netstandard2.0

Overloads¶

1. public static IQbservable<TResult> If<TResult>(this IQbservableProvider provider, Expression<Func<bool>> condition, IObservable<TResult> thenSource)
2. public static IQbservable<TResult> If<TResult>(this IQbservableProvider provider, Expression<Func<bool>> condition, IObservable<TResult> thenSource, IObservable<TResult> elseSource)
3. public static IQbservable<TResult> If<TResult>(this IQbservableProvider provider, Expression<Func<bool>> condition, IObservable<TResult> thenSource, IScheduler scheduler)

1. Overload¶

public static IQbservable<TResult> If<TResult>(this IQbservableProvider provider, Expression<Func<bool>> condition, IObservable<TResult> thenSource)

Summary: If the specified condition evaluates true, select the thenSource sequence. Otherwise, return an empty sequence.

Type parameters

Name	Description
`TResult`	The type of the elements in the result sequence.

Parameters

Name	Type	Description
`provider`	[IQbservableProvider](#	Query provider used to construct the [IQbservable](# data source.
`condition`	Expression>	Condition evaluated to decide which sequence to return.
`thenSource`	IObservable	Sequence returned in case `condition` evaluates true.

Returns: IQbservable -- thenSource if condition evaluates true; an empty sequence otherwise.

Exceptions

Type	Condition
System.ArgumentNullException	`condition` or `thenSource` is null.

2. Overload¶

public static IQbservable<TResult> If<TResult>(this IQbservableProvider provider, Expression<Func<bool>> condition, IObservable<TResult> thenSource, IObservable<TResult> elseSource)

Summary: If the specified condition evaluates true, select the thenSource sequence. Otherwise, select the elseSource sequence.

Type parameters

Name	Description
`TResult`	The type of the elements in the result sequence.

Parameters

Name	Type	Description
`provider`	[IQbservableProvider](#	Query provider used to construct the [IQbservable](# data source.
`condition`	Expression>	Condition evaluated to decide which sequence to return.
`thenSource`	IObservable	Sequence returned in case `condition` evaluates true.
`elseSource`	IObservable	Sequence returned in case `condition` evaluates false.

Returns: IQbservable -- thenSource if condition evaluates true; elseSource otherwise.

Exceptions

Type	Condition
System.ArgumentNullException	`condition` or `thenSource` or `elseSource` is null.

3. Overload¶

public static IQbservable<TResult> If<TResult>(this IQbservableProvider provider, Expression<Func<bool>> condition, IObservable<TResult> thenSource, IScheduler scheduler)

Summary: If the specified condition evaluates true, select the thenSource sequence. Otherwise, return an empty sequence generated on the specified scheduler.

Type parameters

Name	Description
`TResult`	The type of the elements in the result sequence.

Parameters

Name	Type	Description
`provider`	[IQbservableProvider](#	Query provider used to construct the [IQbservable](# data source.
`condition`	Expression>	Condition evaluated to decide which sequence to return.
`thenSource`	IObservable	Sequence returned in case `condition` evaluates true.
`scheduler`	[IScheduler](#	Scheduler to generate an empty sequence on in case `condition` evaluates false.

Returns: IQbservable -- thenSource if condition evaluates true; an empty sequence otherwise.

Exceptions

Type	Condition
System.ArgumentNullException	`condition` or `thenSource` or `scheduler` is null.