/// <summary>
/// Implements the OnStartup event
/// </summary>
/// <param name="application"></param>
/// <returns></returns>
public Result OnStartup(UIControlledApplication application)
{
m_MyForm = null; // no dialog needed yet; the command will bring it
thisApp = this; // static access to this application instance 单例模式
return(Result.Succeeded);
}
/// <summary>
/// This method creates and shows a modeless dialog, unless it already exists.
/// </summary>
/// <remarks>
/// The external command invokes this on the end-user's request
/// </remarks>
///
public void ShowForm(UIApplication uiapp)
{
// If we do not have a dialog yet, create and show it
if (m_MyForm == null || m_MyForm.IsDisposed)
{
// A new handler to handle request posting by the dialog
RequestHandler handler = new RequestHandler();
// External Event for the dialog to use (to post requests)
ExternalEvent exEvent = ExternalEvent.Create(handler);
// We give the objects to the new dialog;
// The dialog becomes the owner responsible fore disposing them, eventually.
m_MyForm = new ModelessForm(exEvent, handler);
m_MyForm.Show();
}
}