在ac#表单上捕获close事件

嘿! 我不是想在这里推动我的运气,但我有另一个c#问题.我尝试过使用谷歌发现的所有可能事件.这是代码:

 private void Form1_OnClose()
        {
            MessageBox.Show("I was closed -2");
        }

        private void Form1_Exit(object sender, EventArgs evArgs)
        {
            MessageBox.Show("I was closed -1");         
        }
        private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            MessageBox.Show("I was closed 0");
        }     

        private void Form1_Closed(object sender, EventArgs e)
        {
            MessageBox.Show("I was closed 1");
        }
        private void Form1_FormClosed(Object sender, FormClosedEventArgs e)
        {

            MessageBox.Show("I was closed 2");
        }

当我执行Alt + f4或单击X按钮时,其中没有一个会触发任何内容.我在这做错了什么？

您可能缺少实际的订阅代码,这是以下几点:

this.Closing += Form1_Closing;

相反,尝试重写OnXXX方法 - 这是做事的首选方式.