LogStore.SetArchiveTail Method
Sets the sequence number of the archive tail.
Assembly: System.IO.Log (in System.IO.Log.dll)
'Declaration Public Sub SetArchiveTail ( _ archiveTail As SequenceNumber _ ) 'Usage Dim instance As LogStore Dim archiveTail As SequenceNumber instance.SetArchiveTail(archiveTail)
Parameters
- archiveTail
- Type: System.IO.Log.SequenceNumber
The sequence number of the archive tail.
| Exception | Condition |
|---|---|
| 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 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(); } } }
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.