# ReadOnlyCollectionCopier<T>.DeepCopy(ReadOnlyCollection<T>, CopyContext)

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

[Source](https://github.com/dotnet/orleans/blob/1644940b035c7bdf215a4fd7135757c06bcfe9ec/src/Orleans.Serialization/Codecs/ReadOnlyCollectionCodec.cs#L69-L94)

```csharp
public ReadOnlyCollection<T>? DeepCopy(ReadOnlyCollection<T>? input, CopyContext context)
```

Creates a deep copy of the provided input.

### Parameters

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

### Returns

A copy of `input`, or `null` if `input` is `null`.