WinForm中窗体的单例模式和单进程

窗体单例模式的实现：

 

public static ChatForm newForm = null;

public static ChatForm GetInstance()
        {
            if (newForm == null || newForm.IsDisposed == true)//newForm.IsDisposed == true必需，否则会出现“访问已释放资源”的异常
            {
                newForm = new ChatForm();
            }
            else
            {
                newForm.Activate();
            }
            return newForm;
        }

//调用：
ChatForm newForm = ChatForm.GetInstance();
newForm.Ipcon = Ip;
newForm.Show();

 

 

单进程的实现：

 

[STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            // get the name of our process
            string proc = Process.GetCurrentProcess().ProcessName;
            // get the list of all processes by that name
            Process[] processes = Process.GetProcessesByName(proc);
            // if there is more than one process
            if (processes.Length > 1)
            {
                MessageBox.Show("程序已经运行！");
                return;
            }
            else
                Application.Run(new MainForm());
        }