# ObsoleteData

- Kind: `class`
- Package: [Aspire.TypeSystem](/reference/api/csharp/aspire.typesystem.md)
- Version: `13.4.0`
- Namespace: `Aspire.TypeSystem`
- Target framework: `net8.0`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.TypeSystem/AttributeDataReader.cs)

Name-based adapter for `ObsoleteAttribute` data, parsed from `Reflection.CustomAttributeData`.

## Definition

```csharp
namespace Aspire.TypeSystem;

public sealed class ObsoleteData
{
    // ...
}
```

## Constructors

- [ObsoleteData](/reference/api/csharp/aspire.typesystem/obsoletedata/constructors.md#constructor)

## Properties

- [IsError](/reference/api/csharp/aspire.typesystem/obsoletedata/properties.md#iserror) : `bool` `get; init` -- Gets whether use of the obsolete API is an error.
- [Message](/reference/api/csharp/aspire.typesystem/obsoletedata/properties.md#message) : `string?` `get; init` -- Gets the obsolete message, if any.