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SetArchiveTail Method
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LogStore.SetArchiveTail Method

Sets the sequence number of the archive tail.

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

public void SetArchiveTail(
	SequenceNumber archiveTail
)

Parameters

archiveTail
Type: System.IO.Log.SequenceNumber
The sequence number of the archive tail.

ExceptionCondition
ArgumentOutOfRangeException

archiveTail is not between the base and last sequence numbers of this sequence.

ArgumentException

archiveTail is not valid for this sequence.

InvalidOperationException

An invalid operation has been executed.

IOException

An I/O error occurs when creating the archive snapshot.

NotSupportedException

The log store is not archivable.

ObjectDisposedException

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

OutOfMemoryException

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

UnauthorizedAccessException

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

The smaller of the base sequence number and the archive tail determines the tail of the log.

The following example shows how to archive a LogStore to an XML document.


class LogBackup
{ 
    static void ArchiveToXML(LogStore logStore, string fileName) 
    {  
        LogArchiveSnapshot snapshot = logStore.CreateLogArchiveSnapshot();

        XmlTextWriter writer = new XmlTextWriter(fileName, Encoding.ASCII);

        writer.WriteStartElement("logArchive");
        foreach(FileRegion region in snapshot.ArchiveRegions) 
        {
            writer.WriteStartElement("fileRegion"); 
            writer.WriteElementString("path", region.Path); 
            writer.WriteElementString("length", region.FileLength.ToString()); 
            writer.WriteElementString("offset", region.Offset.ToString()); 
            using(Stream dataStream = region.GetStream()) 
            { 
                byte[] data = new byte[dataStream.Length]; 
                dataStream.Read(data, 0, data.Length); 
                writer.WriteElementString("data", Convert.ToBase64String(data)); 
            }
            writer.WriteEndElement();
        }
        writer.WriteEndElement(); 
        writer.Close(); 
        logStore.SetArchiveTail(snapshot.LastSequenceNumber); 

    }
    static void RestoreFromXML(string fileName) 
    { 
        using(XmlTextReader reader = new XmlTextReader(fileName)) 
        {
            reader.ReadStartElement("logArchive"); 
            while(reader.IsStartElement()) 
            { 
                string path = reader.ReadElementString("path"); 
                long length = Int64.Parse(reader.ReadElementString("length")); 
                long offset = Int64.Parse(reader.ReadElementString("offset")); 
                string dataString = reader.ReadElementString("data"); 
                byte[] data = Convert.FromBase64String(dataString); 
                FileStream fileStream;
                using(fileStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write)) 
                { 
                    fileStream.SetLength(length); 
                    fileStream.Position = offset; fileStream.Write(data, 0, data.Length); 
                }
            } 
        reader.ReadEndElement(); 
        } 
    } 
}


.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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