# ListCopier<T>.DeepCopy(List<T>, CopyContext)

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

[Source](https://github.com/dotnet/orleans/blob/1644940b035c7bdf215a4fd7135757c06bcfe9ec/src/Orleans.Serialization/Codecs/ListCodec.cs#L186-L206)

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

Creates a deep copy of the provided input.

### Parameters

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

### Returns

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