winform 单例模式单线程例子

最新推荐文章于 2018-09-19 15:48:18 发布

deepwishly

最新推荐文章于 2018-09-19 15:48:18 发布

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CC 4.0 BY-SA版权

文章标签： winform string null

本文链接：https://blog.youkuaiyun.com/deepwishly/article/details/5758905

本文介绍了一种使用WinForm实现单例模式的方法，并通过一个具体示例展示了如何确保应用程序中仅存在一个实例并提供全局访问点。此外，还包含了单线程程序启动的检查逻辑。

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WinForm 单例

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();

单线程

         static void Main()
        {
            //DevExpress.UserSkins.OfficeSkins.Register();
            //DevExpress.UserSkins.BonusSkins.Register();
            DevExpress.XtraEditors.Controls.Localizer.Active = new DevExpress.LocalizationCHS.DevExpressXtraEditorsLocalizationCHS();
            DevExpress.XtraGrid.Localization.GridLocalizer.Active = new DevExpress.LocalizationCHS.DevExpressXtraGridLocalizationCHS();
            DevExpress.XtraPrinting.Localization.PreviewLocalizer.Active = new DevExpress.LocalizationCHS.DevExpressXtraPrintingLocalizationCHS();
            DevExpress.Skins.SkinManager.EnableFormSkins();
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            string proc = Process.GetCurrentProcess().ProcessName;
            Process[] processes = Process.GetProcessesByName(proc);
            if (processes.Length > 1)
            {
                MessageBox.Show("程序已经运行！","操作提示");
            }
            else
            {
                Application.Run(new MainForm());
            }
        }