This documentation is archived and is not being maintained.

EventLog.EventLog(String, String) Constructor

Initializes a new instance of the EventLog class. Associates the instance with a log on the specified computer.

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

public:
EventLog (
	String^ logName, 
	String^ machineName
)
public EventLog (
	String logName, 
	String machineName
)
public function EventLog (
	logName : String, 
	machineName : String
)
Not applicable.

Parameters

logName

The name of the log on the specified computer.

machineName

The computer on which the log exists.

Exception typeCondition

ArgumentNullException

The log name is a null reference (Nothing in Visual Basic).

ArgumentException

The log name is invalid.

-or-

The computer name is invalid.

This overload sets the Log property to the logName parameter and the MachineName property to the machineName parameter. Before calling WriteEntry, specify the Source property of the EventLog. If you are only reading Entries from the log, you can alternatively specify only the Log and MachineName properties.

NoteNote:

This overload of the constructor specifies the Log and MachineName properties, but you can change either before reading the Entries property.

The following table shows initial property values for an instance of EventLog.

Property

Initial Value

Source

An empty string ("").

Log

The logName parameter.

MachineName

The machineName parameter.

The following example reads entries in the event log, "myNewLog", on the computer "myServer".

#using <System.dll>

using namespace System;
using namespace System::Diagnostics;
using namespace System::Threading;
int main()
{
   // Create the source, if it does not already exist.
   if (  !EventLog::SourceExists( "MySource" ) )
   {
      //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", "MyNewLog", "myServer" );
      Console::WriteLine( "CreatingEventSource" );
      // The source is created.  Exit the application to allow it to be registered.
      return 0;
   }

   // Create an EventLog instance and assign its log name.
   EventLog^ myLog = gcnew EventLog( "myNewLog","myServer" );
   
   // Read the event log entries.
   System::Collections::IEnumerator^ myEnum = myLog->Entries->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      EventLogEntry^ entry = safe_cast<EventLogEntry^>(myEnum->Current);
      Console::WriteLine( "\tEntry: {0}", entry->Message );
   }
}


import System.*;
import System.Diagnostics.*;
import System.Threading.*;

class MySample
{
    public static void main(String[] args)
    {
        // Create the source, if it does not already exist.
        if (!(EventLog.SourceExists("MySource")))
        {
            //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", "MyNewLog", "myServer");
            Console.WriteLine("CreatingEventSource");
            // The source is created.  Exit the application to allow it to be registered.
            return;
        }
        // Create an EventLog instance and assign its log name.
        EventLog myLog = new EventLog("myNewLog", "myServer");
        // Read the event log entries.
        for (int iCtr = 0; iCtr < myLog.get_Entries().get_Count(); iCtr++) {
            EventLogEntry entry = myLog.get_Entries().get_Item(iCtr);
            Console.WriteLine("\tEntry: " + entry.get_Message());
        }
    } //main
} //MySample

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
Show: