> For the complete documentation index, see [llms.txt](https://docs.yarnspinner.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yarnspinner.dev/api/csharp/yarn.md). # Yarn Namespace ## Summary Contains classes for working with compiled Yarn programs. ## Classes | Name | Description | | --------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [ConstantTypeProperty](/api/csharp/yarn/yarn.constanttypeproperty.md) | Represents a property that belongs to a type and contains a read-only value. | | [Dialogue](/api/csharp/yarn/yarn.dialogue.md) | Co-ordinates the execution of Yarn programs. | | [DialogueException](/api/csharp/yarn/yarn.dialogueexception.md) | An exception that is thrown by [Dialogue](/api/csharp/yarn/yarn.dialogue.md) when there is an error in executing a [Program](/api/csharp/yarn/yarn.program.md) . | | [EnumBase](/api/csharp/yarn/yarn.enumbase.md) | The base type for all enumeration types. | | [EnumType](/api/csharp/yarn/yarn.enumtype.md) | A type that represents enumerations. | | [FunctionType](/api/csharp/yarn/yarn.functiontype.md) | A type that represents a function. | | [Header](/api/csharp/yarn/yarn.header.md) | | | [Library](/api/csharp/yarn/yarn.library.md) | A collection of functions that can be called from Yarn programs. | | [MemoryVariableStore](/api/csharp/yarn/yarn.memoryvariablestore.md) | A simple concrete implementation of [IVariableStorage](/api/csharp/yarn/yarn.ivariablestorage.md) that keeps all variables in memory. | | [Node](/api/csharp/yarn/yarn.node.md) | A node of Yarn script, contained within a [Program](/api/csharp/yarn/yarn.program.md) , and containing `Yarn.Instruction` s. | | [Program](/api/csharp/yarn/yarn.program.md) | A compiled Yarn program. | | [TypeBase](/api/csharp/yarn/yarn.typebase.md) | Provides the base class for all concrete types. | | [Types](/api/csharp/yarn/yarn.types.md) | Contains the built-in types available in the Yarn language. | ## Delegates | Name | Description | | --------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | | [CommandHandler](/api/csharp/yarn/yarn.commandhandler.md) | Represents the method that is called when the Dialogue delivers a [Command](/api/csharp/yarn/yarn.command.md) . | | [DialogueCompleteHandler](/api/csharp/yarn/yarn.dialoguecompletehandler.md) | Represents the method that is called when the dialogue has reached its end, and no more code remains to be run. | | [LineHandler](/api/csharp/yarn/yarn.linehandler.md) | Represents the method that is called when the Dialogue delivers a [Line](/api/csharp/yarn/yarn.line.md) . | | [Logger](/api/csharp/yarn/yarn.logger.md) | Represents a method that receives diagnostic messages and error information from a [Dialogue](/api/csharp/yarn/yarn.dialogue.md) . | | [NodeCompleteHandler](/api/csharp/yarn/yarn.nodecompletehandler.md) | Represents the method that is called when the Dialogue reaches the end of a node. | | [NodeStartHandler](/api/csharp/yarn/yarn.nodestarthandler.md) | Represents the method that is called when the Dialogue begins executing a node. | | [OptionsHandler](/api/csharp/yarn/yarn.optionshandler.md) | Represents the method that is called when the Dialogue delivers an [OptionSet](/api/csharp/yarn/yarn.optionset.md) . | | [PrepareForLinesHandler](/api/csharp/yarn/yarn.prepareforlineshandler.md) | Represents the method that is called when the dialogue anticipates that it will deliver lines. | ## Enums | Name | Description | | ----------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [VariableKind](/api/csharp/yarn/yarn.variablekind.md) | Represents different kinds of variables that can be fetched from a [Dialogue](/api/csharp/yarn/yarn.dialogue.md) using [TryGetValue\(string,T?)](/api/csharp/yarn/yarn.ivariableaccess/yarn.ivariableaccess.trygetvalue.md) . | ## Interfaces | Name | Description | | --------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------- | | [IMarkupParser](/api/csharp/yarn/yarn.imarkupparser.md) | Contains methods for parsing raw text into a [MarkupParseResult](/api/csharp/yarn.markup/yarn.markup.markupparseresult.md) . | | [ISmartVariableEvaluator](/api/csharp/yarn/yarn.ismartvariableevaluator.md) | Contains methods for evaluating the value of smart variables | | [IType](/api/csharp/yarn/yarn.itype.md) | Defines properties that describe a type in the Yarn language. | | [ITypeMember](/api/csharp/yarn/yarn.itypemember.md) | Provides properties used to work with members of a type. | | [IVariableAccess](/api/csharp/yarn/yarn.ivariableaccess.md) | Provides a mechanism for retrieving values. | | [IVariableStorage](/api/csharp/yarn/yarn.ivariablestorage.md) | Provides a mechanism for storing values. | | [IYarnValue](/api/csharp/yarn/yarn.iyarnvalue.md) | Represents a read-only value in the Yarn Spinner virtual machine. | ## Namespaces | Name | Description | | --------------------------------------------- | ----------------------------------------------------------------------------------------- | | [Yarn.Compiler](/api/csharp/yarn.compiler.md) | Contains classes for compiling Yarn code. | | [Yarn.Markup](/api/csharp/yarn.markup.md) | Contains classes for working with markup in Yarn lines. | | [Yarn.Saliency](/api/csharp/yarn.saliency.md) | Contains classes for choosing the most relevant content out of a set of possible options. | | [Yarn.Unity](/api/csharp/yarn.unity.md) | Contains classes for working with Yarn Spinner in the Unity game engine. | | [Yarn.Utility](/api/csharp/yarn.utility.md) | Contains utility classes used by Yarn Spinner. | ## Structs | Name | Description | | ----------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- | | [Command](/api/csharp/yarn/yarn.command.md) | A command, sent from the [Dialogue](/api/csharp/yarn/yarn.dialogue.md) to the game. | | [Line](/api/csharp/yarn/yarn.line.md) | A line of dialogue, sent from the [Dialogue](/api/csharp/yarn/yarn.dialogue.md) to the game. | | [OptionSet](/api/csharp/yarn/yarn.optionset.md) | A set of [Option](/api/csharp/yarn/yarn.optionset/yarn.optionset.option.md) s, sent from the [Dialogue](/api/csharp/yarn/yarn.dialogue.md) to the game. |