# YarnFunctionAttribute

Class in [Yarn.Unity](https://docs.yarnspinner.dev/2.2/api/csharp/yarn.unity)

Inherits from [`YarnActionAttribute`](https://docs.yarnspinner.dev/2.2/api/csharp/yarn.unity/yarn.unity.yarnactionattribute)

## Summary

Marks the method as a function to be registered with the running instance's library.

```csharp
public class YarnFunctionAttribute : YarnActionAttribute
```

## Remarks

See `Library.RegisterFunction(string, Delegate)` and the generic overloads for what is and is not valid.

This will throw an error if you attempt to add a function that has more than 16 parameters, as that is the largest overload that `Func<TResult>` etc has.

## Properties

| Name                                                                                                                                                  | Description |
| ----------------------------------------------------------------------------------------------------------------------------------------------------- | ----------- |
| [FunctionName](https://docs.yarnspinner.dev/2.2/api/csharp/yarn.unity/yarn.unity.yarnfunctionattribute/yarn.unity.yarnfunctionattribute.functionname) |             |