# IDurableSetCommandCodec<T>.WriteAdd(T, JournalStreamWriter)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.idurablesetcommandcodec-1/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.idurablesetcommandcodec-1/methods/)

```csharp
public abstract void WriteAdd(T item, JournalStreamWriter writer)
```

Writes an add command.

### Parameters

- `item` (`T`)
- `writer` (`JournalStreamWriter`)