# GrainClassMap Constructors

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.metadata.grainclassmap/)

## GrainClassMap(TypeConverter, ImmutableDictionary<GrainType, Type>) {#constructor-orleans-serialization-typesystem-typeconverter-system-collections-im-d4652290}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.metadata.grainclassmap/constructors/constructor-orleans-serialization-typesystem-typeconverter-system-collections-im-d4652290/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Runtime/Manifest/GrainClassMap.cs#L23-L27)

```csharp
public GrainClassMap(TypeConverter typeConverter, ImmutableDictionary<GrainType, Type> classes)
```

Initializes a new instance of the [GrainClassMap](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.metadata.grainclassmap/) class.

### Parameters

- `typeConverter` (`TypeConverter`): The type converter.
- `classes` (`ImmutableDictionary<GrainType, Type>`): The grain classes.