# ImmutableListCodec<T>.ConvertToSurrogate(ImmutableList<T>, ImmutableListSurrogate<T>)

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

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Codecs/ImmutableListCodec.cs#L29)

```csharp
public override void ConvertToSurrogate(ImmutableList<T> value, ref ImmutableListSurrogate<T> surrogate)
```

Converts a value to the surrogate type.

### Parameters

- `value` (`ImmutableList<T>`): The value.
- `surrogate` (`ImmutableListSurrogate<T>`): The surrogate.