/// <summary>
/// Uses a named pipe to send the currently parsed options to an already running
/// instance.
/// </summary>
/// <param name="namedPipePayload"></param>
private static void NamedPipeClientSendOptions(AppPayload namedPipePayload)
{
try
{
using (var namedPipeClientStream = new NamedPipeClientStream(".", GetPipeName(), PipeDirection.Out))
{
namedPipeClientStream.Connect(3000); // Maximum wait 3 seconds
var ser = new DataContractJsonSerializer(typeof(AppPayload));
ser.WriteObject(namedPipeClientStream, namedPipePayload);
}
}
catch (Exception)
{
// Error connecting or sending
}
}
/// <summary>
/// Determines if the application should continue launching or return because it's not
/// the first instance. When not the first instance, the command line args will be passed to the
/// first one.
/// </summary>
/// <param name="otherInstanceCallback">
/// Callback to execute on the first instance with command
/// line args from subsequent launches. Will not run on the main thread, marshalling may be
/// required.
/// </param>
/// <param name="args">Arguments from Main()</param>
/// <returns>true if the first instance, false if it's not the first instance.</returns>
public static bool IsOnlyInstance(Action <string[]> otherInstanceCallback, string[] args)
{
_otherInstanceCallback = otherInstanceCallback ?? throw new ArgumentNullException(nameof(otherInstanceCallback));
if (IsApplicationFirstInstance())
{
_syncContext = SynchronizationContext.Current;
// Setup Named Pipe listener
NamedPipeServerCreateServer();
return(true);
}
else
{
// We are not the first instance, send the named pipe message with our payload and stop loading
var namedPipeXmlPayload = new AppPayload
{
CommandLineArguments = Environment.GetCommandLineArgs().ToList()
};
// Send the message
NamedPipeClientSendOptions(namedPipeXmlPayload);
return(false); // Signal to quit
}
}