6

I am writing a C# application and it takes files as argument, I added it to shell context menu with code listed below;

if (((CheckBox)sender).CheckState == CheckState.Checked)
            {
                RegistryKey key = Registry.CurrentUser.OpenSubKey("Software\\Classes\\*\\shell\\" + KEY_NAME + "\\command");

                if (key == null)
                {
                    key = Registry.CurrentUser.CreateSubKey("Software\\Classes\\*\\shell\\" + KEY_NAME + "\\command");
                    key.SetValue("", Application.ExecutablePath + " \"%1\"");
                }
            }
            else if (((CheckBox)sender).CheckState == CheckState.Unchecked)
            {
                RegistryKey key = Registry.CurrentUser.OpenSubKey("Software\\Classes\\*\\shell\\" + KEY_NAME);

                if (key != null)
                {
                    Registry.CurrentUser.DeleteSubKeyTree("Software\\Classes\\*\\shell\\" + KEY_NAME);
                }

It is working good, but if I select multiple files, multiple instances of application running. for example if I select 5 files 5 application is opening, how can I fix this?

CesarGon
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ZipPy
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1 Answers1

11

Detect if an instance of your application is already running on startup.

If it does, send the command line arguments to the running instance and exit the new instance.

dtb
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