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LogRecordSequence.BeginReserveAndAppend Method (ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object)

Begins an asynchronous reserve and append operation. This method cannot be inherited.

Namespace:  System.IO.Log
Assembly:  System.IO.Log (in System.IO.Log.dll)

public IAsyncResult BeginReserveAndAppend(
	ArraySegment<byte> data,
	SequenceNumber nextUndoRecord,
	SequenceNumber previousRecord,
	RecordAppendOptions recordAppendOptions,
	ReservationCollection reservationCollection,
	long[] reservations,
	AsyncCallback callback,
	Object state


Type: System.ArraySegment<Byte>

A list of byte array segments that will be concatenated and appended as the record.

Type: System.IO.Log.SequenceNumber

The sequence number of the next record in the user-specified order.

Type: System.IO.Log.SequenceNumber

The sequence number of the next record in Previous order.

Type: System.IO.Log.RecordAppendOptions

A valid value of RecordAppendOptions that specifies how the data should be written.

Type: System.IO.Log.ReservationCollection

The reservation collection to make reservations in.

Type: System.Int64[]

The reservations to make, in bytes.

Type: System.AsyncCallback

An optional asynchronous callback, to be called when the append is complete.

Type: System.Object

A user-provided object that distinguishes this particular asynchronous append request from other requests.

Return Value

Type: System.IAsyncResult
An IAsyncResult that represents this asynchronous operation, which could still be pending.


IRecordSequence.BeginReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object)


userRecord or previousRecord is not valid for this sequence.


data cannot be appended because it is larger than the maximum record size.


reservations was not created by this record sequence.


One or more of the arguments are null.


userRecord or previousRecord is not between the base and last sequence numbers of this sequence.


The request could not be performed because of an unexpected I/O exception.


The request could not be performed because of an I/O device error.


The operation cannot be performed because the record sequence was opened with read-only access.


The method was called after the sequence has been disposed of.


There is not enough memory to continue the execution of the program.


The record sequence is full.


Access for the specified log sequence is denied by the operating system.


No reservation large enough to fit data can be found in reservations.

You should pass the IAsyncResult returned by this method to the EndReserveAndAppend method to ensure that the append operation has completed and resources can be freed appropriately. If an error has occurred during an asynchronous append, an exception is not thrown until the EndReserveAndAppend method is called with the IAsyncResult returned by this method.

Data contained in the data parameter will be concatenated into a single byte array for appending as the record. However, no provision is made for splitting data back into array segments when the record is read.

The specified reservations are added to the provided reservation collection in an atomic operation with a record append operation. If the append fails, no space is reserved.

Normally, this method may complete before the record has been written. To ensure that a record has been written, either specify the ForceFlush flag using the recordAppendOptions parameter, or call the Flush method.

If a record sequence has been disposed of, or if you pass an invalid argument, exceptions are thrown immediately within this operation. Errors that occurred during an asynchronous append request, for example, a disk failure during the I/O request, will result in exceptions being thrown when the EndReserveAndAppend method is called.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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