EventLog.OverflowAction プロパティとは? わかりやすく解説

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EventLog.OverflowAction プロパティ

メモ : このプロパティは、.NET Framework version 2.0新しく追加されたものです。

イベント ログ最大ファイル サイズ達した場合に、新しいエントリを格納するように構成され動作取得します

名前空間: System.Diagnostics
アセンブリ: System (system.dll 内)
構文構文

<ComVisibleAttribute(False)> _
Public ReadOnly Property
 OverflowAction As OverflowAction
Dim instance As EventLog
Dim value As OverflowAction

value = instance.OverflowAction
[ComVisibleAttribute(false)] 
public OverflowAction OverflowAction { get;
 }
[ComVisibleAttribute(false)] 
public:
property OverflowAction OverflowAction {
    OverflowAction get ();
}
/** @property */
public OverflowAction get_OverflowAction ()
public function get OverflowAction
 () : OverflowAction

プロパティ
イベント ログ最大サイズ達した場合に、新しいエントリを格納するように構成され動作指定する OverflowAction 値。既定値は OverwriteOlder です。

解説解説
使用例使用例

ローカル コンピュータ定義されイベント ログ列挙し、各イベント ログ構成情報表示する例を次に示します

Shared Sub DisplayEventLogProperties()

   ' Iterate through the current set of event log files,
   ' displaying the property settings for each file.
   Dim eventLogs As EventLog() = EventLog.GetEventLogs()
   
   Dim e As EventLog
   For Each e In  eventLogs
      Dim sizeKB As Int64 = 0
      
      Console.WriteLine()
      Console.WriteLine("{0}:", e.LogDisplayName)
      Console.WriteLine("  Log name = " + ControlChars.Tab
 _
                          + ControlChars.Tab + " {0}",
 e.Log)

      Console.WriteLine("  Number of event log entries = {0}",
 e.Entries.Count.ToString())
      
      ' Determine if there is an event log file for this event log.
      Dim regEventLog As RegistryKey
      regEventLog = Registry.LocalMachine.OpenSubKey( _
             ("System\CurrentControlSet\Services\EventLog\"
 + e.Log))

      If Not (regEventLog Is
 Nothing) Then

         Dim temp As Object
 = regEventLog.GetValue("File")
         If Not (temp Is
 Nothing) Then

            Console.WriteLine("  Log file path = "
 + ControlChars.Tab _
                                  + " {0}", temp.ToString())
            Dim file As New
 FileInfo(temp.ToString())
            
            ' Get the current size of the event log file.
            If file.Exists Then
               sizeKB = file.Length / 1024
               If file.Length Mod 1024 <>
 0 Then
                  sizeKB += 1
               End If
               Console.WriteLine("  Current size = "
 + ControlChars.Tab _
                          + " {0} kilobytes", sizeKB.ToString())
            End If
         Else
            Console.WriteLine("  Log file path = "
 + ControlChars.Tab _
                             + " <not set>")
         End If
      End If
      
      ' Display the maximum size and overflow settings.
      sizeKB = e.MaximumKilobytes
      Console.WriteLine("  Maximum size = " + ControlChars.Tab
 _
                         + " {0} kilobytes", sizeKB.ToString())
      Console.WriteLine("  Overflow setting = " +
 ControlChars.Tab _
                         + " {0}", e.OverflowAction.ToString())
      
      Select Case e.OverflowAction
         Case OverflowAction.OverwriteOlder
            Console.WriteLine(ControlChars.Tab + _
                 " Entries are retained a minimum of {0} days.",
 _
                 e.MinimumRetentionDays)
         Case OverflowAction.DoNotOverwrite
            Console.WriteLine(ControlChars.Tab + _
                 " Older entries are not overwritten.")
         Case OverflowAction.OverwriteAsNeeded
            Console.WriteLine(ControlChars.Tab + _
                 " If number of entries equals max size limit,
 a new event log entry overwrites the oldest entry.")
         Case Else
      End Select

   Next e

End Sub
static void DisplayEventLogProperties()
{
    // Iterate through the current set of event log files,
    // displaying the property settings for each file.

    EventLog[] eventLogs = EventLog.GetEventLogs();
    foreach (EventLog e in eventLogs)
    {
        Int64 sizeKB = 0;

        Console.WriteLine();
        Console.WriteLine("{0}:", e.LogDisplayName);
        Console.WriteLine("  Log name = \t\t {0}", e.Log); 

        Console.WriteLine("  Number of event log entries = {0}", e.Entries.Count.ToString());
                    
        // Determine if there is an event log file for this event log.
        RegistryKey regEventLog = Registry.LocalMachine.OpenSubKey("System\\CurrentControlSet\\Services\\EventLog\\"
 + e.Log);
        if (regEventLog != null)
        {
            Object temp = regEventLog.GetValue("File");
            if (temp != null)
            {
                Console.WriteLine("  Log file path = \t {0}", temp.ToString());
                FileInfo file = new FileInfo(temp.ToString());

                // Get the current size of the event log file.
                if (file.Exists)
                {
                    sizeKB = file.Length / 1024;
                    if ((file.Length % 1024) != 0)
                    {
                        sizeKB++;
                    }
                    Console.WriteLine("  Current size = \t {0} kilobytes"
,
 sizeKB.ToString());
                }
            }
            else
            {
                Console.WriteLine("  Log file path = \t <not set>");
            }
        }
                    
        // Display the maximum size and overflow settings.

        sizeKB = e.MaximumKilobytes;
        Console.WriteLine("  Maximum size = \t {0} kilobytes", sizeKB.ToString());
        Console.WriteLine("  Overflow setting = \t {0}", e.OverflowAction.ToString());

        switch (e.OverflowAction)
        {
            case OverflowAction.OverwriteOlder:
                Console.WriteLine("\t Entries are retained a minimum of {0}
 days.", 
                    e.MinimumRetentionDays);
                break;
            case OverflowAction.DoNotOverwrite:
                Console.WriteLine("\t Older entries are not overwritten.");
                break;
            case OverflowAction.OverwriteAsNeeded:
                Console.WriteLine("\t If number of entries equals max size limit,
 a new event log entry overwrites the oldest entry.");
                break;
            default:
                break;
        }
    }
}
static void DisplayEventLogProperties()
{
    // Iterate through the current set of event log files,
    // displaying the property settings for each file.
    EventLog eventLogs[] = EventLog.GetEventLogs();
    EventLog e;
    for ( int iCtr = 0; iCtr < eventLogs.length;
 iCtr++ ) {
        e = eventLogs[iCtr];
        long sizeKB = 0;

        Console.WriteLine();
        Console.WriteLine("{0}:", e.get_LogDisplayName());
        Console.WriteLine("  Log name = \t\t {0}", e.get_Log());
        Console.WriteLine("  Number of event log entries = {0}",
            ((Int32)e.get_Entries().get_Count()).ToString());

        // Determine if there is an event log file for this event log.
        RegistryKey regEventLog = Registry.LocalMachine.
            OpenSubKey("System\\CurrentControlSet\\Services\\EventLog\\"
            + e.get_Log());

        if (regEventLog != null) {
            Object temp = regEventLog.GetValue("File");

            if (temp != null) {
                Console.WriteLine("  Log file path = \t {0}", 
                    temp.ToString());
                FileInfo file = new FileInfo(temp.ToString());
                // Get the current size of the event log file.
                if (file.get_Exists()) {
                    sizeKB = file.get_Length() / 1024;
                    if (file.get_Length() % 1024 != 0) {
                        sizeKB++;
                    }

                    Console.WriteLine("  Current size = \t {0} kilobytes"
,
                        ((Int64)sizeKB).ToString());
                }
            }
            else {
                Console.WriteLine("  Log file path = \t <not set>");
            }
        }

        // Display the maximum size and overflow settings.
        sizeKB = e.get_MaximumKilobytes();
        Console.WriteLine("  Maximum size = \t {0} kilobytes", 
            ((Int64)sizeKB).ToString());
        Console.WriteLine("  Overflow setting = \t {0}",
            e.get_OverflowAction().ToString());
        switch (e.get_OverflowAction()) {
            case OverflowAction.OverwriteOlder :
                Console.WriteLine("\t Entries are retained a minimum of "
                    + "{0} days.", (Int32)e.get_MinimumRetentionDays());
                break;
            case OverflowAction.DoNotOverwrite :
                Console.WriteLine("\t Older entries are not overwritten.");
                break;
            case OverflowAction.OverwriteAsNeeded :
                Console.WriteLine("\t If number of entries equals max "
                    + "size limit, a new event log entry
 overwrites "
                    + "the oldest entry.");
                break;
            default :
                break;
        }
    }
} //DisplayEventLogProperties
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参照参照
関連項目
EventLog クラス
EventLog メンバ
System.Diagnostics 名前空間
OverflowAction
EventLog.MaximumKilobytes プロパティ
ModifyOverflowPolicy
EventLog.MinimumRetentionDays プロパティ


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