# Codec_EventHubMessage.WriteField(Writer<TBufferWriter>, uint, Type, EventHubMessage)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming.eventhubs/orleanscodegen.orleans.streaming.eventhubs.codec-eventhubmessage/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.streaming.eventhubs/orleanscodegen.orleans.streaming.eventhubs.codec-eventhubmessage/methods/)

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

Writes a field.

### Parameters

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