添加或删除使用子表单检测的MDI表单

Question

是否有可以用来判断是否已从MDI父级添加或删除子表单的事件？

Answer 1

是.在主MDI表单上,连接到MdiChildActivated事件.

像这样:

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.MdiChildActivate += new EventHandler(Form1_MdiChildActivate);
        }

        void Form1_MdiChildActivate(object sender, EventArgs e)
        {
            MessageBox.Show("Activated");
        }

        private void addToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Form form2 = new Form2();
            form2.MdiParent = this;
            form2.Show();
        }
    }

当子表单被激活或停用时,该事件将触发.