# AddCommandHandler(string,Action\<T1, T2, T3, T4>)

Method in [Actions](https://docs.yarnspinner.dev/2.3/api/csharp/yarn.unity/yarn.unity.actions)

## Summary

```csharp
public void AddCommandHandler<T1, T2, T3, T4>(string commandName, Action<T1, T2, T3, T4> handler);
```

## Parameters

| Name                                    | Description |
| --------------------------------------- | ----------- |
| `string` commandName                    |             |
| `System.Action<T1, T2, T3, T4>` handler |             |