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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, 

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

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


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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0