# CollectionCopier<T>.DeepCopy(Collection<T>, Collection<T>, CopyContext)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.collectioncopier-1/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.collectioncopier-1/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Codecs/CollectionCodec.cs#L208-L214)

```csharp
public void DeepCopy(Collection<T> input, Collection<T> output, CopyContext context)
```

Clones members from `input` and copies them to `output`.

### Parameters

- `input` (`Collection<T>`): The input.
- `output` (`Collection<T>`): The output.
- `context` (`CopyContext`): The context.