# IExpressionValue

- Kind: `interface`
- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Version: `13.3.0`
- Namespace: `Aspire.Hosting.ApplicationModel`
- Target framework: `net8.0`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/IExpressionValue.cs)
- Implements: [IManifestExpressionProvider](/reference/api/csharp/aspire.hosting/imanifestexpressionprovider.md), [IValueProvider](/reference/api/csharp/aspire.hosting/ivalueprovider.md)

Represents a value that provides both a runtime value and a manifest expression.

## Definition

```csharp
namespace Aspire.Hosting.ApplicationModel;

public interface IExpressionValue
    : Aspire.Hosting.ApplicationModel.IManifestExpressionProvider,
      Aspire.Hosting.ApplicationModel.IValueProvider
{
    // ...
}
```

## ATS metadata

### ATS export

- Type ID: `Aspire.Hosting/IExpressionValue`

## Remarks

Expression values can be used anywhere both a runtime value and a publish-time manifest expression are needed.