Winform 窗体单例

 

有窗体Form1和窗体Form2,单击Form1上按钮,只弹出一个Form2。

Form2里自定义一个方法,里面判断是否弹出Form2,没有时弹出Form2。

1         public static Form2 instance;
2         public static Form2 CreateForm()
3         {
4             if (instance == null || instance.IsDisposed)
5             {
6                 instance = new Form2();
7             }
8             return instance;
9         }

Form1里用Form2的CreateForm()方法实例化Form2,

 1 Form2 f2 = Form2.CreateForm(); 

 

 

 

泛型形式:

  public class Form_Singleton where T : Form, new()
    {
        //private static T t_Form = null;
        public static T t_Form { get; set; }
        public static T CreateForm()
        {
            if (t_Form == null || t_Form.IsDisposed)
            {
                t_Form = new T();
            }
            return t_Form;
        }
    }

调用:

Form2 f2 = Form_Singleton.CreateForm();

 

相关参考:

单例模式(Winform窗体的实现)

泛型约束 | where T : class的含义

 

转载于:https://www.cnblogs.com/xifengyeluo/p/6078667.html

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