# Yarn Namespace ## Summary Contains classes for working with compiled Yarn programs. ## Classes | Name | Description | | ------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [BuiltinTypes](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.builtintypes) | Contains the built-in types available in the Yarn language. | | [Dialogue](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.dialogue) | Co-ordinates the execution of Yarn programs. | | [DialogueException](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.dialogueexception) | An exception that is thrown by [Dialogue](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.dialogue) when there is an error in executing a [Program](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.program) . | | [FunctionType](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.functiontype) | A type that represents functions. | | [Library](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.library) | A collection of functions that can be called from Yarn programs. | | [MemoryVariableStore](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.memoryvariablestore) | A simple concrete implementation of [IVariableStorage](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.ivariablestorage) that keeps all variables in memory. | | [Node](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.node) | A node of Yarn script, contained within a [Program](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.program) , and containing `Yarn.Instruction` s. | | [Program](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.program) | A compiled Yarn program. | ## Delegates | Name | Description | | -------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [CommandHandler](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.commandhandler) | Represents the method that is called when the Dialogue delivers a [Command](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.command) . | | [DialogueCompleteHandler](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.dialoguecompletehandler) | Represents the method that is called when the dialogue has reached its end, and no more code remains to be run. | | [LineHandler](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.linehandler) | Represents the method that is called when the Dialogue delivers a [Line](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.line) . | | [Logger](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.logger) | Represents a method that receives diagnostic messages and error information from a [Dialogue](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.dialogue) . | | [NodeCompleteHandler](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.nodecompletehandler) | Represents the method that is called when the Dialogue reaches the end of a node. | | [NodeStartHandler](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.nodestarthandler) | Represents the method that is called when the Dialogue begins executing a node. | | [OptionsHandler](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.optionshandler) | Represents the method that is called when the Dialogue delivers an [OptionSet](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.optionset) . | | [PrepareForLinesHandler](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.prepareforlineshandler) | Represents the method that is called when the dialogue anticipates that it will deliver lines. | ## Interfaces | Name | Description | | ------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------ | | [IType](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.itype) | Defines properties that describe a type in the Yarn language. | | [IVariableStorage](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.ivariablestorage) | Provides a mechanism for storing and retrieving instances of the `Yarn.Value` class. | ## Namespaces | Name | Description | | -------------------------------------------------------------------------- | ------------------------------------------------------------------------ | | [Yarn.Compiler](https://docs.yarnspinner.dev/2.1/api/csharp/yarn.compiler) | Contains classes for compiling Yarn code. | | [Yarn.Markup](https://docs.yarnspinner.dev/2.1/api/csharp/yarn.markup) | Contains classes for working with markup in Yarn lines. | | [Yarn.Unity](https://docs.yarnspinner.dev/2.1/api/csharp/yarn.unity) | Contains classes for working with Yarn Spinner in the Unity game engine. | ## Structs | Name | Description | | ---------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [Command](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.command) | A command, sent from the [Dialogue](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.dialogue) to the game. | | [Line](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.line) | A line of dialogue, sent from the [Dialogue](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.dialogue) to the game. | | [OptionSet](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.optionset) | A set of [Option](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.optionset/yarn.optionset.option) s, sent from the [Dialogue](https://docs.yarnspinner.dev/2.1/api/csharp/yarn/yarn.dialogue) to the game. |