# GenerateMethodSerializersAttribute Properties

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization.abstractions/orleans.generatemethodserializersattribute/)

## IsExtension {#isextension-32ec73ca}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.serialization.abstractions/orleans.generatemethodserializersattribute/properties/isextension-32ec73ca/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization.Abstractions/Annotations.cs#L55)

```csharp
public bool IsExtension
```

Gets a value indicating whether this interface is an extension interface.

### Value

true if this instance is extension; otherwise, false.

## ProxyBase {#proxybase-ee10e60e}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.serialization.abstractions/orleans.generatemethodserializersattribute/properties/proxybase-ee10e60e/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization.Abstractions/Annotations.cs#L49)

```csharp
public Type ProxyBase
```

Gets the base type which the source generator will use for generated proxy classes.

### Value

The proxy base type.