# IEvictionStrategy.PurgeObservable

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ievictionstrategy/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ievictionstrategy/properties/)

```csharp
public abstract IPurgeObservable PurgeObservable
```

Gets the [IPurgeObservable](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ipurgeobservable/), which is implemented by the cache to do purge related actions and invoked by the eviction strategy.