namespace System.Dynamic { public abstract class UnaryOperationBinder : DynamicMetaObjectBinder { public ExpressionType Operation { get; } protected UnaryOperationBinder(ExpressionType operation); public DynamicMetaObject FallbackUnaryOperation(DynamicMetaObject target); public abstract DynamicMetaObject FallbackUnaryOperation(DynamicMetaObject target, DynamicMetaObject errorSuggestion); } }