MDI 关闭窗口我的例子

最新推荐文章于 2024-12-10 16:31:31 发布

原创最新推荐文章于 2024-12-10 16:31:31 发布 · 889 阅读

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#object #button #null

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本文探讨了在C#中两个窗体（Form1和Form2）之间的交互过程，特别是在关闭窗体时触发的不同事件及其顺序。文章通过代码示例展示了如何在主窗体Form1关闭时确保子窗体Form2也正确关闭，并且处理了相应的事件来跟踪每个窗体的状态变化。

         Form2 m_Form2 = null;
        private void button1_Click(object sender, EventArgs e)
        {
            this.Disposed += new System.EventHandler(this.Form_Disposed);
            if (m_Form2 == null)
                m_Form2 = new Form2();
            m_Form2.MdiParent = this;
            m_Form2.Show();
        }

1 form2 closing

2 form1 closing

3 form2 closed

4 form1 closed

       private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            MessageBox.Show("form1 closing");
            m_Form2.Close();
        }

1 form2 closing

2 form1 closing

3 form2 closing

4 form2 closed

5 form2 disposed

6 form1 closed

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            MessageBox.Show("form1 closed");
            m_Form2.Close();
        }

1 form2 closing

2 form1 closing

3 form2 closed

4 form1 closed

5 form2 closing

6 form2 closed

7 form2 disposed