# ArcBufferCodec.WriteField(Writer<TBufferWriter>, uint, Type?, ArcBuffer)

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

[Source](https://github.com/dotnet/orleans/blob/997f2589e814db85c6a451b59c081c88e50b8944/src/Orleans.Serialization/Codecs/ArcBufferCodec.cs#L21-L26)

```csharp
public void WriteField<TBufferWriter>(ref Writer<TBufferWriter> writer, uint fieldIdDelta, Type? expectedType, ArcBuffer value)
```

Writes a field.

### Parameters

- `writer` (`Writer<TBufferWriter>`): The writer.
- `fieldIdDelta` (`uint`): The field identifier delta.
- `expectedType` (`Type?`): The expected type.
- `value` (`ArcBuffer`): The value.