)}

Observer.Checked(IObserver) method¶

Defined in

Type: Observer Namespace: System.Reactive Assembly: System.Reactive.dll

Applies to

netstandard2.0

public static IObserver<T> Checked<T>(this IObserver<T> observer)

Summary: Checks access to the observer for grammar violations. This includes checking for multiple OnError or OnCompleted calls, as well as reentrancy in any of the observer methods. If a violation is detected, an InvalidOperationException is thrown from the offending observer method call.

Type parameters

Name	Description
`T`	The type of the elements received by the source observer.

Parameters

Name	Type	Description
`observer`	IObserver	The observer whose callback invocations should be checked for grammar violations.

Returns: IObserver -- An observer that checks callbacks invocations against the observer grammar and, if the checks pass, forwards those to the specified observer.

Exceptions

Type	Condition
System.ArgumentNullException	`observer` is null.