c# - 运行 Windows 窗体应用程序的多个实例

Question

我决定为此创建一个聊天应用程序，我需要将单个表单运行 2 次(即)我需要在运行时将同一个表单作为两个不同的实例查看...是否有可能实现它。

注意:我不需要在任何事件中完成它。每当我运行我的程序时，都必须运行 2 个实例。

Answer 1

两种解决方案:

• 只需构建您的可执行文件并根据需要运行尽可能多的实例。

• 使用更复杂的解决方案，利用 Application.Run Method (ApplicationContext) .请参阅下面的简化 MSDN 示例。

  class MyApplicationContext : ApplicationContext
  {
      private int formCount;
      private Form1 form1;
      private Form1 form2;
  
      private MyApplicationContext()
      {
          formCount = 0;
  
          // Create both application forms and handle the Closed event 
          // to know when both forms are closed.
          form1 = new Form1();
          form1.Closed += new EventHandler(OnFormClosed);
          formCount++;
  
          form2 = new Form1();
          form2.Closed += new EventHandler(OnFormClosed);
          formCount++;
  
          // Show both forms.
          form1.Show();
          form2.Show();
      }
  
      private void OnFormClosed(object sender, EventArgs e)
      {
          // When a form is closed, decrement the count of open forms. 
  
          // When the count gets to 0, exit the app by calling 
          // ExitThread().
          formCount--;
          if (formCount == 0)
              ExitThread();
      }
  
      [STAThread]
      static void Main(string[] args)
      {
  
          // Create the MyApplicationContext, that derives from ApplicationContext, 
          // that manages when the application should exit.
  
          MyApplicationContext context = new MyApplicationContext();
  
          // Run the application with the specific context. It will exit when 
          // all forms are closed.
          Application.Run(context);
      }
  }