Mono.Addins.AddinEngine.CheckInstalled C# (CSharp) Method

        public void CheckInstalled(string message, params string[] addinIds)
        {
            ArrayList notInstalled = new ArrayList ();
            foreach (string id in addinIds) {
                Addin addin = Registry.GetAddin (id, false);
                if (addin != null) {
                    // The add-in is already installed
                    // If the add-in is disabled, enable it now
                    if (!addin.Enabled)
                        addin.Enabled = true;
                } else {
                    notInstalled.Add (id);
                }
            }
            if (notInstalled.Count == 0)
                return;

            var ins = installer;

            if (ins == null)
                throw new InvalidOperationException ("Add-in installer not set");

            // Install the add-ins
            ins.InstallAddins (Registry, message, (string[]) notInstalled.ToArray (typeof(string)));
        }

 /// <summary>
 /// Checks if the provided add-ins are installed, and requests the installation of those
 /// which aren't.
 /// </summary>
 /// <param name="message">
 /// Message to show to the user when new add-ins have to be installed.
 /// </param>
 /// <param name="addinIds">
 /// List of IDs of the add-ins to be checked.
 /// </param>
 /// <remarks>
 /// This method checks if the specified add-ins are installed.
 /// If some of the add-ins are not installed, it will use
 /// the installer assigned to the DefaultAddinInstaller property
 /// to install them. If the installation fails, or if DefaultAddinInstaller
 /// is not set, an exception will be thrown.
 /// </remarks>
 public static void CheckInstalled(string message, params string[] addinIds)
 {
     AddinEngine.CheckInstalled(message, addinIds);
 }