c# - 检测表单关闭的原因

Question

如何检测 Windows 窗体的关闭方式？例如，如何确定用户是否单击了关闭表单的按钮，或者用户是否单击了右上角的“X”？谢谢。

更新:

忘记提到按钮调用 Application.Exit() 方法。

Answer 1

正如 bashmohandes 和 Dmitriy Matveev 已经提到的，解决方案应该是 FormClosingEventArgs。但正如 Dmitriy 所说，这不会对您的按钮和右上角的 X 产生任何影响。

为了区分这两个选项，您可以在表单中添加一个 bool 属性 ExitButtonClicked 并在调用 Application.Exit() 之前在按钮点击事件中将其设置为 true。

现在您可以在 FormClosing 事件中询问此属性，并在 case UserClosing 中区分这两个选项。

例子:

    public bool UserClosing { get; set; }

    public FormMain()
    {
        InitializeComponent();

        UserClosing = false;
        this.buttonExit.Click += new EventHandler(buttonExit_Click);
        this.FormClosing += new FormClosingEventHandler(Form1_FormClosing);
    }

    void buttonExit_Click(object sender, EventArgs e)
    {
        UserClosing = true;
        this.Close();
    }

    void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        switch (e.CloseReason)
        {
            case CloseReason.ApplicationExitCall:
                break;
            case CloseReason.FormOwnerClosing:
                break;
            case CloseReason.MdiFormClosing:
                break;
            case CloseReason.None:
                break;
            case CloseReason.TaskManagerClosing:
                break;
            case CloseReason.UserClosing:
                if (UserClosing)
                {
                    //what should happen if the user hitted the button?
                }
                else
                {
                    //what should happen if the user hitted the x in the upper right corner?
                }
                break;
            case CloseReason.WindowsShutDown:
                break;
            default:
                break;
        }

        // Set it back to false, just for the case e.Cancel was set to true
        // and the closing was aborted.
        UserClosing = false;
    }