EventLogEntry Class

Definition

Namespace:

System.Diagnostics

Assembly:

System.Diagnostics.EventLog.dll

Source:

EventLogEntry.cs

Encapsulates a single record in the event log. This class cannot be inherited.

public ref class EventLogEntry sealed : System::ComponentModel::Component, System::Runtime::Serialization::ISerializable

public sealed class EventLogEntry : System.ComponentModel.Component, System.Runtime.Serialization.ISerializable

type EventLogEntry = class
    inherit Component
    interface ISerializable

Public NotInheritable Class EventLogEntry
Inherits Component
Implements ISerializable

Inheritance

Object

MarshalByRefObject

Component

EventLogEntry

Implements

ISerializable

Examples

The following code example demonstrates the use of the EventLogEntry class. In this example, a switch statement uses console input to search for event log entries for the specified event type. If a match is found, log entry source information is displayed at the console.

#using <System.dll>

using namespace System;
using namespace System::Diagnostics;

int main()
{
   String^ myEventType = nullptr;
   
   // Associate the instance of 'EventLog' with local System Log.
   EventLog^ myEventLog = gcnew EventLog( "System","." );
   Console::WriteLine( "1:Error" );
   Console::WriteLine( "2:Information" );
   Console::WriteLine( "3:Warning" );
   Console::WriteLine( "Select the Event Type" );
   int myOption = Convert::ToInt32( Console::ReadLine() );
   switch ( myOption )
   {
      case 1:
         myEventType = "Error";
         break;

      case 2:
         myEventType = "Information";
         break;

      case 3:
         myEventType = "Warning";
         break;

      default:
         break;
   }
   EventLogEntryCollection^ myLogEntryCollection = myEventLog->Entries;
   int myCount = myLogEntryCollection->Count;
   
   // Iterate through all 'EventLogEntry' instances in 'EventLog'.
   for ( int i = myCount - 1; i > -1; i-- )
   {
      EventLogEntry^ myLogEntry = myLogEntryCollection[ i ];
      
      // Select the entry having desired EventType.
      if ( myLogEntry->EntryType.Equals( myEventType ) )
      {
         // Display Source of the event.
         Console::WriteLine( "{0} was the source of last event of type {1}", myLogEntry->Source, myLogEntry->EntryType );
         return 0;
      }
   }
}

using System;
using System.Diagnostics;
   class MyEventlogClass
   {
      public static void Main()
      {
         String myEventType=null;
         // Associate the instance of 'EventLog' with local System Log.
         EventLog myEventLog = new EventLog("System", ".");
         Console.WriteLine("1:Error");
         Console.WriteLine("2:Information");
         Console.WriteLine("3:Warning");
         Console.WriteLine("Select the Event Type");
         int myOption=Convert.ToInt32(Console.ReadLine());
         switch(myOption)
         {
            case 1:  myEventType="Error";
                     break;
            case 2:  myEventType="Information";
                     break;
            case 3:  myEventType="Warning";
                     break;
            default: break;
         }

            EventLogEntryCollection myLogEntryCollection=myEventLog.Entries;
            int myCount =myLogEntryCollection.Count;
            // Iterate through all 'EventLogEntry' instances in 'EventLog'.
            for(int i=myCount-1;i>-1;i--)
            {
               EventLogEntry myLogEntry = myLogEntryCollection[i];
               // Select the entry having desired EventType.
               if(myLogEntry.EntryType.ToString().Equals(myEventType))
               {
                  // Display Source of the event.
                  Console.WriteLine(myLogEntry.Source
                     +" was the source of last event of type "
                     +myLogEntry.EntryType);
                  return;
               }
            }
         }
   }

Imports System.Diagnostics

Class MyEventlogClass
   Public Shared Sub Main()
      Dim myEventType As String = Nothing
      ' Associate the instance of 'EventLog' with local System Log.
      Dim myEventLog As New EventLog("System", ".")
      Console.WriteLine("1:Error")
      Console.WriteLine("2:Information")
      Console.WriteLine("3:Warning")
      Console.WriteLine("Select the Event Type")
      Dim myOption As Integer = Convert.ToInt32(Console.ReadLine())
      Select Case myOption
         Case 1
            myEventType = "Error"
         Case 2
            myEventType = "Information"
         Case 3
            myEventType = "Warning"
         Case Else
      End Select

      Dim myLogEntryCollection As EventLogEntryCollection = myEventLog.Entries
      Dim myCount As Integer = myLogEntryCollection.Count
      ' Iterate through all 'EventLogEntry' instances in 'EventLog'.
      Dim i As Integer
      For i = myCount - 1 To 0 Step -1
         Dim myLogEntry As EventLogEntry = myLogEntryCollection(i)
         ' Select the entry having desired EventType.
         If myLogEntry.EntryType.ToString().Equals(myEventType) Then
            ' Display Source of the event.
            Console.WriteLine(myLogEntry.Source + " was the source of last "& _
                             "event of type " & myLogEntry.EntryType.ToString())
            Return
         End If
      Next 
   End Sub
End Class

Remarks

You usually will not create instances of EventLogEntry directly when working with the EventLog class. The Entries member of the EventLog class contains a collection of EventLogEntry instances, which you iterate over when reading by using the EventLogEntryCollection.Item[] class index member.

Important

This type implements the IDisposable interface. When you have finished using the type, you should dispose of it either directly or indirectly. To dispose of the type directly, call its Dispose method in a try/catch block. To dispose of it indirectly, use a language construct such as using (in C#) or Using (in Visual Basic). For more information, see the "Using an Object that Implements IDisposable" section in the IDisposable interface topic.

Properties

CanRaiseEvents	Gets a value indicating whether the component can raise an event. (Inherited from Component)
Category	Gets the text associated with the CategoryNumber property for this entry.
CategoryNumber	Gets the category number of the event log entry.
Container	Gets the IContainer that contains the Component. (Inherited from Component)
Data	Gets the binary data associated with the entry.
DesignMode	Gets a value that indicates whether the Component is currently in design mode. (Inherited from Component)
EntryType	Gets the event type of this entry.
EventID	Obsolete. Gets the application-specific event identifier for the current event entry.
Events	Gets the list of event handlers that are attached to this Component. (Inherited from Component)
Index	Gets the index of this entry in the event log.
InstanceId	Gets the resource identifier that designates the message text of the event entry.
MachineName	Gets the name of the computer on which this entry was generated.
Message	Gets the localized message associated with this event entry.
ReplacementStrings	Gets the replacement strings associated with the event log entry.
Site	Gets or sets the ISite of the Component. (Inherited from Component)
Source	Gets the name of the application that generated this event.
TimeGenerated	Gets the local time at which this event was generated.
TimeWritten	Gets the local time at which this event was written to the log.
UserName	Gets the name of the user who is responsible for this event.

Methods

CreateObjRef(Type)	Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject)
Dispose()	Releases all resources used by the Component. (Inherited from Component)
Dispose(Boolean)	Releases the unmanaged resources used by the Component and optionally releases the managed resources. (Inherited from Component)
Equals(EventLogEntry)	Performs a comparison between two event log entries.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetLifetimeService()	Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject)
GetService(Type)	Returns an object that represents a service provided by the Component or by its Container. (Inherited from Component)
GetType()	Gets the Type of the current instance. (Inherited from Object)
InitializeLifetimeService()	Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
MemberwiseClone(Boolean)	Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject)
ToString()	Returns a String containing the name of the Component, if any. This method should not be overridden. (Inherited from Component)

Events

Disposed

Occurs when the component is disposed by a call to the Dispose() method. (Inherited from Component)

Explicit Interface Implementations

ISerializable.GetObjectData(SerializationInfo, StreamingContext)

Populates a SerializationInfo with the data needed to serialize the target object.

See also

• EventLog
• EventLogEntryCollection
• EventInstance