# VariableStorageBehaviour

Class in [Yarn.Unity](/api/csharp/yarn.unity.md)

Inherits from `UnityEngine.MonoBehaviour`

## Summary

A `UnityEngine.MonoBehaviour` that a [DialogueRunner](/api/csharp/yarn.unity/yarn.unity.dialoguerunner.md) uses to store and retrieve variables.

```csharp
public abstract class VariableStorageBehaviour : MonoBehaviour, Yarn.IVariableStorage
```

## Remarks

This abstract class inherits from `UnityEngine.MonoBehaviour` , which means that subclasses of this class can be attached to `UnityEngine.GameObject` s.

## Methods

| Name                                                                                                                                                                                       | Description                                                                                                                  |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------- |
| [AddChangeListener(System.Action\<string, object>)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.addchangelistener-2.md)                 | Registers a delegate that will be called when any variable is modified.                                                      |
| [AddChangeListener(string,Action)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.addchangelistener-1.md)                                  | Registers a delegate that will be called when the variable `variableName` is modified.                                       |
| [Clear()](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.clear.md)                                                                         |                                                                                                                              |
| [Contains(string)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.contains.md)                                                             | Returns a boolean value representing if a particular variable is inside the variable storage.                                |
| [GetAllVariables()](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.getallvariables.md)                                                     | Provides a unified interface for exporting all variables. Intended to be a point for custom saving, editors, etc.            |
| [GetVariableKind(string)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.getvariablekind.md)                                               |                                                                                                                              |
| [SetAllVariables(FloatDictionary,StringDictionary,BoolDictionary,bool)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.setallvariables.md) | Provides a unified interface for loading many variables all at once. Will override anything already in the variable storage. |
| [SetValue(string,bool)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.setvalue-3.md)                                                      |                                                                                                                              |
| [SetValue(string,float)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.setvalue-2.md)                                                     |                                                                                                                              |
| [SetValue(string,string)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.setvalue-1.md)                                                    |                                                                                                                              |
| [TryGetValue(string,T?)](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.trygetvalue.md)                                                    |                                                                                                                              |

## Properties

| Name                                                                                                                                               | Description |
| -------------------------------------------------------------------------------------------------------------------------------------------------- | ----------- |
| [Program](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.program.md)                               |             |
| [SmartVariableEvaluator](/api/csharp/yarn.unity/yarn.unity.variablestoragebehaviour/yarn.unity.variablestoragebehaviour.smartvariableevaluator.md) |             |


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