# GenerateMethodSerializersAttribute.IsExtension

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

[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.