# Sandbox.UI.MixinDefinition.Parameters

```csharp
List<MixinParameter> Parameters { get; set; }
```

Parameter definitions in order, with optional default values.
Key = parameter name (without $), Value = default value (null if required)

Declared in [Sandbox.UI.MixinDefinition](/api/Sandbox.UI.MixinDefinition).
Assembly: `Sandbox.Engine`.