C# Windows 程序退出请求 (Detect Application.Exit) 无表单 [英] C# Windows Program Exit Request (Detect Application.Exit) No Forms

问题描述

是否有可能检测到 Application.Exit 是否被调用过，或者是否有一个 win32 函数可以知道 Windows 何时因为关机或其他原因想要关闭您的程序.没有表格.

Is it possible to detect once Application.Exit was called or is there an win32 function to know when windows like to close your program, because of shutdown or anything. No Forms.

推荐答案

请参阅 MSDN 文档以了解 WM_QUERYENDSESSION 和 WM_ENDSESSION 条消息；WM_ENDSESSION 消息的参数会告诉你你的应用程序是正常退出还是因为 Windows 正在关闭.您可以通过覆盖表单中的 WndProc 方法来处理这些消息，例如:

See the MSDN documentation for the WM_QUERYENDSESSION and WM_ENDSESSION messages; the parameters of the WM_ENDSESSION message will tell you if your app is exiting normally or because Windows is shutting down. You can handle these messages by overriding the WndProc method in your form, something like:

public partial class MainForm : Form
{
    private const int WM_ENDSESSION = 0x0016;
    private const uint ENDSESSION_CLOSEAPP = 0x1;
    private const uint ENDSESSION_CRITICAL = 0x40000000;
    private const uint ENDSESSION_LOGOFF = 0x80000000;
    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_ENDSESSION)
        {
            var sessionEnding = m.WParam.ToInt32() != 0;

            if ((m.LParam.ToInt64() & ENDSESSION_CLOSEAPP) == ENDSESSION_CLOSEAPP)
            {
                // App closing
            }
            if ((m.LParam.ToInt64() & ENDSESSION_CRITICAL) == ENDSESSION_CRITICAL)
            {
                // Critical error
            }
            if ((m.LParam.ToInt64() & ENDSESSION_LOGOFF) == ENDSESSION_LOGOFF)
            {
                // User logging off
            }

            m.Result = IntPtr.Zero;
        }
        else
        {
            base.WndProc(ref m);
        }
    }
}

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