Winform 随手记

有关打开唯一窗口不是特别理解  手记

用Form1中的button 4 打开Form 5 这个唯一窗体

Form1中代码

        #region 打开唯一窗口
        public List<Form> FormList = new List<Form>();

        private void button4_Click(object sender, EventArgs e)
        {
            Form5 f5 = new Form5(this);

            bool has = false;

            foreach (Form f in FormList)
            {
                if (f is Form5)
                {
                    has = true;
                }
            }

            if (has == false)
            {
                FormList.Add(f5);
                f5.Owner = this;
                f5.Show();
            }
            else
            {

            }
            #endregion

Form5中代码

        #region 打开唯一窗口
        Form1 F1 = null;

        public Form5(Form1 f1)
        {
            InitializeComponent();
            F1 = f1;
        }

        private void Form5_Load(object sender, EventArgs e)
        {
            F1.FormList.Remove(this);
        }
        #endregion