# JsonDurableSetCommandCodec<T>.WriteSnapshot(IReadOnlyCollection<T>, JournalStreamWriter)

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

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Journaling/Formats/Json/JsonDurableCollectionCommandCodecs.cs#L321-L342)

```csharp
public void WriteSnapshot(IReadOnlyCollection<T> items, JournalStreamWriter writer)
```

Writes a snapshot command, deriving the item count from `items`.

### Parameters

- `items` (`IReadOnlyCollection<T>`)
- `writer` (`JournalStreamWriter`)