EventLog.Exists Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Determines whether the specified log exists.
Overloads
Exists(String) |
Determines whether the log exists on the local computer. |
Exists(String, String) |
Determines whether the log exists on the specified computer. |
Exists(String)
- Source:
- EventLog.cs
- Source:
- EventLog.cs
- Source:
- EventLog.cs
- Source:
- EventLog.cs
- Source:
- EventLog.cs
Determines whether the log exists on the local computer.
public:
static bool Exists(System::String ^ logName);
public static bool Exists (string logName);
static member Exists : string -> bool
Public Shared Function Exists (logName As String) As Boolean
Parameters
- logName
- String
The name of the log to search for. Possible values include: Application, Security, System, other application-specific logs (such as those associated with Active Directory), or any custom log on the computer.
Returns
true
if the log exists on the local computer; otherwise, false
.
Exceptions
The logName is null
or the value is empty.
Examples
String^ myLog = "myNewLog";
if ( EventLog::Exists( myLog ) )
{
Console::WriteLine( "Log '{0}' exists.", myLog );
}
else
{
Console::WriteLine( "Log '{0}' does not exist.", myLog );
}
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception: {0}", e->Message );
}
}
string myLog = "myNewLog";
if (EventLog.Exists(myLog))
{
Console.WriteLine("Log '"+myLog+"' exists.");
}
else
{
Console.WriteLine("Log '"+myLog+"' does not exist.");
}
Dim myLog As String = "myNewLog"
If EventLog.Exists(myLog) Then
Console.WriteLine("Log '" + myLog + "' exists.")
Else
Console.WriteLine("Log '" + myLog + "' does not exist.")
End If
Remarks
Use this method to determine if a log exists on the local computer. If you want to determine whether a source exists on the local computer, use SourceExists.
Because this method accesses the registry, you must have the appropriate registry permissions on the local computer; otherwise, the query returns false
.
Because you cannot give a new log the name of an existing log on the same computer, use this method before creating a new log to determine if the specified logName
already exists on the local computer. The logName
parameter is not case sensitive.
Exists is a static
method, so it can be called on the class itself. It is not necessary to create an instance of EventLog to call Exists.
See also
Applies to
Exists(String, String)
- Source:
- EventLog.cs
- Source:
- EventLog.cs
- Source:
- EventLog.cs
- Source:
- EventLog.cs
- Source:
- EventLog.cs
Determines whether the log exists on the specified computer.
public:
static bool Exists(System::String ^ logName, System::String ^ machineName);
public static bool Exists (string logName, string machineName);
static member Exists : string * string -> bool
Public Shared Function Exists (logName As String, machineName As String) As Boolean
Parameters
- logName
- String
The log for which to search. Possible values include: Application, Security, System, other application-specific logs (such as those associated with Active Directory), or any custom log on the computer.
- machineName
- String
The name of the computer on which to search for the log, or "." for the local computer.
Returns
true
if the log exists on the specified computer; otherwise, false
.
Exceptions
The machineName
parameter is an invalid format. Make sure you have used proper syntax for the computer on which you are searching.
-or-
The logName
is null
or the value is empty.
Remarks
Use this method to determine if a log exists on a remote computer. If you want to determine whether a source exists on a remote computer, use SourceExists.
Because this method accesses the registry, you must have the appropriate registry permissions on the specified computer; otherwise, the query returns false
.
Because you cannot give a new log the name of an existing log on the same computer, use this method before creating a new log to determine if one with the specified logName
already exists on the server specified by the machineName
parameter. The logName
and machineName
parameters are not case sensitive.
Exists is a static
method, so it can be called on the class itself. It is not necessary to create a new instance of EventLog to call Exists.