namespace System.Dynamic { public abstract class GetIndexBinder : DynamicMetaObjectBinder { public CallInfo CallInfo { get; } protected GetIndexBinder(CallInfo callInfo); public DynamicMetaObject FallbackGetIndex(DynamicMetaObject target, DynamicMetaObject[] indexes); public abstract DynamicMetaObject FallbackGetIndex(DynamicMetaObject target, DynamicMetaObject[] indexes, DynamicMetaObject errorSuggestion); } }