public IAsyncResult BeginAppend( IList <ArraySegment <byte> > data, SequenceNumber userRecord, SequenceNumber previousRecord, RecordAppendOptions recordAppendOptions, ReservationCollection reservations, AsyncCallback callback, object state) { long totalRecordSize; LogReservationCollection lrc; if ((this.store.Access & FileAccess.Write) == 0) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.NotSupported(SR.NotSupported_ReadOnly)); } if (recordAppendOptions > (RecordAppendOptions.ForceAppend | RecordAppendOptions.ForceFlush) || recordAppendOptions < RecordAppendOptions.None) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentOutOfRange("recordAppendOptions")); } this.store.ValidateSequenceNumber( ref userRecord, SequenceNumberConstraint.Arbitrary, "userRecord"); this.store.ValidateSequenceNumber( ref previousRecord, SequenceNumberConstraint.Arbitrary, "previousRecord"); totalRecordSize = ValidateData(data); lrc = ValidateReservationCollection(reservations); EnsureMarshalContext(); LogAppendAsyncResult result = new LogAppendAsyncResult(this, callback, state); result.Data = data; result.TotalRecordSize = totalRecordSize; result.UserLsn = userRecord.High; result.PreviousLsn = previousRecord.High; result.RecordAppendOptions = recordAppendOptions; result.ReservationCollection = lrc; result.Start(); return(result); }