EventLog.LogNameFromSourceName(String, String) Method

Definition

Namespace:

System.Diagnostics

Assembly:

System.Diagnostics.EventLog.dll

Gets the name of the log to which the specified source is registered.

public:
 static System::String ^ LogNameFromSourceName(System::String ^ source, System::String ^ machineName);

public static string LogNameFromSourceName (string source, string machineName);

static member LogNameFromSourceName : string * string -> string

Public Shared Function LogNameFromSourceName (source As String, machineName As String) As String

Parameters

source

String

The name of the event source.

machineName

String

The name of the computer on which to look, or "." for the local computer.

Returns

String

The name of the log associated with the specified source in the registry.

Examples

The following example deletes a source from the local computer. The example determines the log from its source, and then deletes the log.

Note

More than one source might write to an event log. Before deleting a custom log, make sure there are no other sources writing to that log.

#using <System.dll>

using namespace System;
using namespace System::Diagnostics;
using namespace System::Threading;
int main()
{
   String^ logName;
   if ( EventLog::SourceExists( "MySource" ) )
   {
      
      // Find the log associated with this source.    
      logName = EventLog::LogNameFromSourceName( "MySource", "." );
      // Make sure the source is in the log we believe it to be in
      if (logName != "MyLog")
          return -1;
      // Delete the source and the log.
      EventLog::DeleteEventSource( "MySource" );
      EventLog::Delete( logName );
      Console::WriteLine( "{0} deleted.", logName );
   }
   else
        {
            // Create the event source to make next try successful.
            EventLog::CreateEventSource("MySource", "MyLog");
        }
}

using System;
using System.Diagnostics;
using System.Threading;

class MySample1
{
    public static void Main()
    {
        string logName;

        if (EventLog.SourceExists("MySource"))
        {
            // Find the log associated with this source.
            logName = EventLog.LogNameFromSourceName("MySource", ".");
            // Make sure the source is in the log we believe it to be in.
            if (logName != "MyLog")
                return;
            // Delete the source and the log.
            EventLog.DeleteEventSource("MySource");
            EventLog.Delete(logName);

            Console.WriteLine(logName + " deleted.");
        }
        else
        {
            // Create the event source to make next try successful.
            EventLog.CreateEventSource("MySource", "MyLog");
        }
    }
}

Option Explicit On
Option Strict On

Imports System.Diagnostics
Imports System.Threading

Class MySample
    Public Shared Sub Main()
        Dim logName As String

        If EventLog.SourceExists("MySource") Then
            ' Find the log associated with this source.    
            logName = EventLog.LogNameFromSourceName("MySource", ".")
            ' Make sure the source is in the log we believe it to be in
            If (logName <> "MyLog") Then
                Return
            End If
            ' Delete the source and the log.
            EventLog.DeleteEventSource("MySource")
            EventLog.Delete(logName)

            Console.WriteLine((logName & " deleted."))
        Else
            ' Create the event source to make next try successful.
            EventLog.CreateEventSource("MySource", "MyLog")
        End If
    End Sub
End Class

Remarks

The event source indicates what logs the event. It is often the name of the application, or the name of a subcomponent of the application, if the application is large. Applications and services should write to the Application log or a custom log. Device drivers should write to the System log.

When you create a new source, which can only write to one log at a time, the system registers your application with the event log as a valid source of entries. The Source property can be any string, but the name cannot be used by other sources on the computer. An attempt to create a duplicated Source value throws an exception. However, a single event log can have many different sources writing to it.

See also

• Source
• MachineName
• Log
• SourceExists(String)