# AtsConstants Fields - Package: [Aspire.TypeSystem](/reference/api/csharp/aspire.typesystem.md) - Type: [AtsConstants](/reference/api/csharp/aspire.typesystem/atsconstants.md) - Kind: `Fields` - Members: `22` Constants for ATS (Aspire Type System) type IDs and capability IDs. ## Any - Name: `Any` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Any type ID. Maps from .NET `Object`. Accepts any supported ATS type. Use when a parameter needs to accept multiple types without explicit union declaration. ```csharp public const static string Any ``` ## ApplicationTypeId - Name: `ApplicationTypeId` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Type ID for DistributedApplication. ```csharp public const static string ApplicationTypeId ``` ## AspireHostingAssembly - Name: `AspireHostingAssembly` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) The Aspire.Hosting assembly name. ```csharp public const static string AspireHostingAssembly ``` ## Boolean - Name: `Boolean` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Boolean type ID. Maps from .NET `Boolean`. ```csharp public const static string Boolean ``` ## BuildCapability - Name: `BuildCapability` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Capability ID for building the application. ```csharp public const static string BuildCapability ``` ## BuilderTypeId - Name: `BuilderTypeId` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Type ID for IDistributedApplicationBuilder. ```csharp public const static string BuilderTypeId ``` ## CancellationToken - Name: `CancellationToken` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) CancellationToken type ID. Maps from .NET `Threading.CancellationToken`. In TypeScript, maps to AbortSignal for cancellation support. ```csharp public const static string CancellationToken ``` ## Char - Name: `Char` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Char type ID. Maps from .NET `Char`. Serializes to JSON string. ```csharp public const static string Char ``` ## CreateBuilderCapability - Name: `CreateBuilderCapability` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Capability ID for creating a builder. ```csharp public const static string CreateBuilderCapability ``` ## DateOnly - Name: `DateOnly` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) DateOnly type ID. Maps from .NET `DateOnly`. Serializes to JSON string (YYYY-MM-DD). ```csharp public const static string DateOnly ``` ## DateTime - Name: `DateTime` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) DateTime type ID. Maps from .NET `DateTime`. Serializes to JSON string (ISO 8601). ```csharp public const static string DateTime ``` ## DateTimeOffset - Name: `DateTimeOffset` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) DateTimeOffset type ID. Maps from .NET `DateTimeOffset`. Serializes to JSON string (ISO 8601). ```csharp public const static string DateTimeOffset ``` ## EnumPrefix - Name: `EnumPrefix` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Enum type ID prefix. Maps from .NET enum types. Full format: "enum:{FullTypeName}". Serializes to JSON string (enum name). ```csharp public const static string EnumPrefix ``` ## Guid - Name: `Guid` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Guid type ID. Maps from .NET `Guid`. Serializes to JSON string. ```csharp public const static string Guid ``` ## Number - Name: `Number` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Number type ID. Maps from .NET numeric types (int, long, float, double, decimal, etc.). Serializes to JSON number. ```csharp public const static string Number ``` ## ReferenceExpressionTypeId - Name: `ReferenceExpressionTypeId` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Type ID for ReferenceExpression. ```csharp public const static string ReferenceExpressionTypeId ``` ## RunCapability - Name: `RunCapability` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Capability ID for running the application. ```csharp public const static string RunCapability ``` ## String - Name: `String` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) String type ID. Maps from .NET `String`. ```csharp public const static string String ``` ## TimeOnly - Name: `TimeOnly` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) TimeOnly type ID. Maps from .NET `TimeOnly`. Serializes to JSON string (HH:mm:ss). ```csharp public const static string TimeOnly ``` ## TimeSpan - Name: `TimeSpan` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) TimeSpan type ID. Maps from .NET `TimeSpan`. Serializes to JSON number (total milliseconds). ```csharp public const static string TimeSpan ``` ## Uri - Name: `Uri` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Uri type ID. Maps from .NET `Uri`. Serializes to JSON string. ```csharp public const static string Uri ``` ## Void - Name: `Void` - Modifiers: `static` `const` - Returns: `string` - Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AtsConstants.cs) Void type ID. Represents no return value. ```csharp public const static string Void ```