无退出申请关闭窗体

您可以隐藏第一个窗体而不是关闭它:

this.Hide();
Form2 form2 = new Form2();
form2.Show();

你不能改变program.cs,让它运行主窗体吗?在主窗体启动时,它创建并显示一个登录窗体,然后隐藏自己(等待登录出现)?

Application.MainWindow 在关闭您的登录窗体之前,转到您的第二个“主”窗口。

Program.cs是您的主要功能所在。如果您使用visualstudio将项目创建为Windows应用程序,那么main中将有一个函数运行启动程序时打开的窗体。只需从main中的登录窗体获取登录信息,然后调用第二个窗口。举个例子:

[STAThread]
private static void Main(string[] args)
{
    //there's some other code here that initializes the program

    //Starts the first form (login form)
    Application.Run(new form1());

    //Get the login info here somehow. Maybe save in public members of form1 or
    // in a global utilities or global user class of some kind

    //Run the main program
    Application.Run(new mainProgramForm());
}

编辑:忘了什么

private static void Main(string[] args)
{
    //there's some other code here that initializes the program

    //Instead of running a new form here, first create it and then run it
    Form1 form1 = new Form1();    //Creates the form
    Application.Run(form1);       //Runs the form. Program.cs will continue after the form closes

    //Get the login info
    string username = form1.Username;
    string password = form1.Password;

    //Get rid of form1 if you choose
    form1.Dispose();

    //Validate the user info

    //Run the main program
    Application.Run(new mainProgramForm());
}

Open Program.cs-在调用应用程序运行之前,您可以做很多事情,包括显示您的登录信息。这是我的一个项目的一个例子。它试图找到数据库连接。如果不能,它将打开一个向导并连接到access或mssql。如果打开良好,它会显示一个spalsh屏幕并最终运行应用程序,否则它会关闭。

Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
DialogResult LclResult;

EESDatabasePersistentData LclPersist;
LclPersist = new EESDatabasePersistentData();
string LclDataType;
string LclDatabase;
string LclServer;
string Password;
string UserID;
if (!LclPersist.GetConnection(out LclServer, out LclDatabase, out LclDataType, out UserID, out Password))
{
        // Run the connection wizard
        GetConnection(out LclServer, out LclDatabase, out LclDataType, out UserID, out Password);
}


if (LclDataType == "ACCESS")
        InitDataAccess(LclDatabase);
else if (LclDataType == "SQLSERVER")
        InitDataSQL(LclServer, LclDatabase, UserID, Password);
if (OpenGood)
{
        if (!System.Diagnostics.Debugger.IsAttached)
        {
                FormSplash.Instance.SetupVersion();
                ///////////////////////////////////
                // If we don't call do events 
                // splash delays loading.
                Application.DoEvents();
                FormSplash.Instance.Show();
        }
        Application.DoEvents();

        Application.Run(new FormMentorMain());
}
else
        Application.Exit();

它被称为托盘图标

close all forms 以及 app still running user can go back to app any time

让我们开始编码(注意这是WPF应用程序)

private NotifyIcon m_notifyIcon;
private ContextMenuStrip m_contextMenu;
private bool _ForceClose;

public MainWindow()
{
     InitializeComponent();
     CreateNotifyIcon();

}

private void CreateNotifyIcon()
{
    m_contextMenu = new ContextMenuStrip();

    ToolStripMenuItem mI1 = new ToolStripMenuItem { Text = "Open" };
    mI1.Click += (sender, args) => Maximize();
    ToolStripMenuItem mI2 = new ToolStripMenuItem { Text = "Exit" };
    mI2.Click += (sender, args) => EndApplication();
    m_contextMenu.Items.Add(mI1);
    m_contextMenu.Items.Add(mI2);
    //Initalize Notify Icon
    m_notifyIcon = new NotifyIcon
    {
        Text = "Application Title",
        Icon = new Icon("Icon.ico"),
        //Associate the contextmenustrip with notify icon
        ContextMenuStrip = m_contextMenu,
        Visible = true
    };
}

protected void Minimize()
{
    Hide();
}

protected void Maximize()
{
    Show();
    this.WindowState =WindowState.Normal;
}

protected void EndApplication()
{
    Minimize();
    Thread.Sleep(1000);
    _ForceClose = true;
    WindowState = WindowState.Normal;
    this.Close();
    Environment.Exit(0);
}

而且在 Window Closing 事件侦听器(不要忘记添加它)

private void Window_Closing(object sender, CancelEventArgs e)
{
    if (_ForceClose == false)
    {
        e.Cancel = true;
        Minimize();
    }
}