namespace System { public class OperationCanceledException : SystemException { public CancellationToken CancellationToken { get; } public OperationCanceledException(); protected OperationCanceledException(SerializationInfo info, StreamingContext context); public OperationCanceledException(string message); public OperationCanceledException(string message, Exception innerException); public OperationCanceledException(string message, Exception innerException, CancellationToken token); public OperationCanceledException(string message, CancellationToken token); public OperationCanceledException(CancellationToken token); } }