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EventLogEntryCollection Class

Defines size and enumerators for a collection of EventLogEntry instances.

Namespace: System.Diagnostics
Assembly: System (in system.dll)

public class EventLogEntryCollection : ICollection, IEnumerable
public class EventLogEntryCollection implements ICollection, IEnumerable
public class EventLogEntryCollection implements ICollection, IEnumerable
Not applicable.

Use the EventLogEntryCollection class when reading the entries associated with an EventLog instance. The Entries property of the EventLog class is a collection of all the entries in the event log.

Because new entries are appended to the existing list, stepping through the collection enables you to access the entries that were created after you originally created the EventLogEntryCollection. However, after you view the entire list, it is not updated with new entries.

The following example demonstrates how to obtain event log information from an EventLogEntryCollection object.

using System;
using System.Collections;
using System.Diagnostics;

class EventLogEntryCollection_Item
{
    public static void Main()
    {
        try
        {
            string myLogName = "MyNewLog";
            // Check if the source exists.
            if (!EventLog.SourceExists("MySource"))
            {
                // Create the source.
                // An event log source should not be created and immediately used.
                // There is a latency time to enable the source, it should be created
                // prior to executing the application that uses the source.
                // Execute this sample a second time to use the new source.
                EventLog.CreateEventSource("MySource", myLogName);
                Console.WriteLine("Creating EventSource");
                Console.WriteLine("Exiting, execute the application a second time to use the source.");
                // The source is created.  Exit the application to allow it to be registered.
                return;
            }
            else
                // Get the EventLog associated if the source exists.
                myLogName = EventLog.LogNameFromSourceName("MySource", ".");

            // Create an EventLog instance and assign its source.
            EventLog myEventLog2 = new EventLog();
            myEventLog2.Source = "MySource";
            // Write an informational entry to the event log.
            myEventLog2.WriteEntry("Successfully created a new Entry in the Log");
            myEventLog2.Close();
            // Create a new EventLog object.
            EventLog myEventLog1 = new EventLog();
            myEventLog1.Log = myLogName;

            // Obtain the Log Entries of "MyNewLog".
            EventLogEntryCollection myEventLogEntryCollection =
               myEventLog1.Entries;
            myEventLog1.Close();
            Console.WriteLine("The number of entries in 'MyNewLog' = "
               + myEventLogEntryCollection.Count);

            // Display the 'Message' property of EventLogEntry.
            for (int i = 0; i < myEventLogEntryCollection.Count; i++)
            {
                Console.WriteLine("The Message of the EventLog is :"
                   + myEventLogEntryCollection[i].Message);
            }

            // Copy the EventLog entries to Array of type EventLogEntry.
            EventLogEntry[] myEventLogEntryArray =
               new EventLogEntry[myEventLogEntryCollection.Count];
            myEventLogEntryCollection.CopyTo(myEventLogEntryArray, 0);
            IEnumerator myEnumerator = myEventLogEntryArray.GetEnumerator();
            while (myEnumerator.MoveNext())
            {
                EventLogEntry myEventLogEntry = (EventLogEntry)myEnumerator.Current;
                Console.WriteLine("The LocalTime the Event is generated is "
                   + myEventLogEntry.TimeGenerated);
            }
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception:{0}", e.Message);
        }
    }
}

import System.*;
import System.Collections.*;
import System.Diagnostics.*;

class EventLogEntryCollectionItem
{
    public static void main(String[] args)
    {
        try {
            String myLogName = "MyNewLog";

            // Check if the source exists.
            if (!(EventLog.SourceExists("MySource"))) {
                //Create source.
                EventLog.CreateEventSource("MySource", myLogName);
                Console.WriteLine("Creating EventSource");
            }
            else {
                // Get the EventLog associated if the source exists.
                myLogName = EventLog.LogNameFromSourceName("MySource", ".");
            }

            // Create an EventLog instance and assign its source.
            EventLog myEventLog2 = new EventLog();
            myEventLog2.set_Source("MySource");

            // Write an informational entry to the event log.
            myEventLog2.WriteEntry("Successfully created a new Entry in "
                + "the Log");
            myEventLog2.Close();

            // Create a new EventLog object.
            EventLog myEventLog1 = new EventLog();
            myEventLog1.set_Log(myLogName);

            // Obtain the Log Entries of "MyNewLog".
            EventLogEntryCollection myEventLogEntryCollection = 
                myEventLog1.get_Entries();

            myEventLog1.Close();
            Console.WriteLine("The number of entries in 'MyNewLog' = " 
                + myEventLogEntryCollection.get_Count());

            // Display the 'Message' property of EventLogEntry.
            for (int i = 0; i < myEventLogEntryCollection.get_Count(); i++) {
                Console.WriteLine("The Message of the EventLog is :"
                    + myEventLogEntryCollection.get_Item(i).get_Message());
            }
            // Copy the EventLog entries to Array of type EventLogEntry.
            EventLogEntry myEventLogEntryArray[] = 
                new EventLogEntry[myEventLogEntryCollection.get_Count()];

            myEventLogEntryCollection.CopyTo(myEventLogEntryArray, 0);
            IEnumerator myEnumerator = myEventLogEntryArray.GetEnumerator();
            while (myEnumerator.MoveNext()) {
                EventLogEntry myEventLogEntry = 
                    (EventLogEntry)myEnumerator.get_Current();
                Console.WriteLine("The LocalTime the Event is generated is " 
                    + myEventLogEntry.get_TimeGenerated());
            }
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception:{0}", e.get_Message());
        }
    } //main
} //EventLogEntryCollectionItem

System.Object
  System.Diagnostics.EventLogEntryCollection

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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