# MapFieldCodec<TKey, TValue> Constructors

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization.protobuf/orleans.serialization.mapfieldcodec-2/)

## MapFieldCodec<TKey, TValue>(IFieldCodec<TKey>, IFieldCodec<TValue>) {#constructor-orleans-serialization-codecs-ifieldcodec-tkey-orleans-serialization-056a9041}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.serialization.protobuf/orleans.serialization.mapfieldcodec-2/constructors/constructor-orleans-serialization-codecs-ifieldcodec-tkey-orleans-serialization-056a9041/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Serializers/Orleans.Serialization.Protobuf/MapFieldCodec.cs#L21-L38)

```csharp
public MapFieldCodec<TKey, MapFieldCodec(IFieldCodec<TKey> keyCodec, IFieldCodec<TValue> valueCodec)
```

Initializes a new instance of the `Orleans.Serialization.MapFieldCodec-2` class.

### Parameters

- `keyCodec` (`IFieldCodec<TKey>`): The key codec.
- `valueCodec` (`IFieldCodec<TValue>`): The value codec.