Question

我想同时关闭两个表单。我有一个以程序开头的主要表单。当用户点击按钮时，主窗体将隐藏，其他窗体将弹出。在第二个表单上，如果用户单击“返回主”按钮，它应隐藏第二个表单并显示主表单。但问题是如果用户试图关闭第二个表单，它也应该关闭主表单。我怎样才能关闭主表格

Answer 1

我只是将Application.Exit（）用于此线程请求的内容。

Application.Exit();

更新：更正

我曾经说过这不会调用表格结束事件，但在文档中它确实在这里调用它是文档的链接

http://msdn.microsoft.com/en-us/library/ms157894(v=vs.110).aspx

Answer 2

如果您指定了为回到主表单而编写的代码，那就更好了，所以我可以通过更改您的代码来帮助您。但现在因为我不知道你是怎么做到的，我必须为这两个任务编写代码。可以使用布尔变量来执行您想要的操作。请遵循以下代码：

public partial class MainForm : Form
{
//"Click" event of the button that should opens the second form:
private void goToSecondForm_Click(object sender, EventArgs e)
    {
        Form2 f2 = new Form2(); //Or you can write it out of this method.
        this.Hide(); //Hides the main form.
        f2.ShowDialog(); // Shows the second form.
        this.Show(); // Shows the main form again, after closing the second form using your own button.
    }
}


public partial class Form2 : Form
{
    bool selfClose = false; //False shows that user closed the second form by default button and true shows that user closed it by your own button.
    //"Click" event of the button that should closes just the second form and returns user to the main form:
    private void ownCloseButton_Click(object sender, EventArgs e)
    {
        selfClose = true; //Means user clicked on your own button.
        this.Close(); //So the program closes the second form and runs f2_FormClosed method, but because selfClose became true here, happened nothing there and program will go back to goToSecondForm_Click method in the main form and will run this.Show() .
    }
//"FormClosed" event of the second form :
//Whether user clicked on your own button or on the default one, this method will run.
private void f2_FormClosed(object sender, FormClosedEventArgs e)
    {
        if (!selfClose) //It means user didn't click on your own button and both of forms must be closed .
            Application.Exit(); //So the program closes all of forms (actually closes the program) and couldn't access to any other commands (including this.Show() in goToSecondForm_Click method).
    }
}

Answer 3

正如其他人所说，当您的子表单关闭时，您需要以某种方式在主表单上调用.Close()。但是，正如您所指出的那样，您的子表单中没有自动引用主表单！这给你留下了一些选择。

<强> 1。立即退出应用程序。这是通过在子表单的“返回主”按钮的单击事件处理程序中调用Application.Exit();来完成的。它将立即关闭所有形式，这可能只是你想要的。

// .. ChildForm code ..
void OnBackToMainClicked(object sender, EventArgs e)
{
    Application.Exit();
}

<强> 2。将对主窗体的引用传递给子窗体。这可能是解决这个问题的最常用方法。在主表单中创建子表单时，您需要按如下方式传递引用：

// .. MainForm code ..
void OnGoToChildForm(object sender, EventArgs e)
{
    var childForm = new ChildForm(this);
    childForm.Show();
}

// .. ChildForm code ..
private MainForm mainForm; // This is where the child form will keep a reference to
                           // the main form that you can use later

public ChildForm(MainForm mainForm)
{
    // This is the child form's constructor that we called above,
    // and it's where we'll save the reference to the main form
    this.mainForm = mainForm;
}

// This also needs to be the event handler for the close event
void OnBackToMainClicked(object sender, EventArgs e)
{
    this.Close();
    mainForm.Close();
}

第3。在子表单的FormClosed事件上添加事件处理程序。如果您担心将主应用程序逻辑保持在主窗体的控制之下，这是一种解决问题的安全方法。它类似于上面Lamloumi建议的解决方案，但它都是在主窗体的代码中完成的。

// .. MainForm code ..
void OnGoToChildForm(object sender, EventArgs e)
{
    var childForm = new ChildForm(this);
    childForm.FormClosed += new FormClosedEventHandler(SecondForm_FormClosed);
    childForm.Show();
}

void SecondForm_FormClosed(object sender, EventArgs e)
{
    // Perform any final cleanup logic here.
    this.Close();
}

Answer 4

通常情况下，在Home表单中你会有这样的话：

  SecondForm second= new SecondForm ();
       second.Show();
       this.Hide();

在SecondForm中你必须像这样关闭事件：

   public class SecondForm :Form{

            public SecondForm()
                  {
                 InitializeComponent();
                 this.FormClosed += new FormClosedEventHandler(SecondForm_FormClosed);
                   }

                void SecondForm_FormClosed(object sender, FormClosedEventArgs e)
                {
                Application.Exit();
                 }
}

确保在关闭表单后关闭应用程序。因为如果不这样做，Home from仍然是活动的并且隐藏起来。

Answer 5

Form1 _FirstForm = New Form1();
Form2 _SecondForm = New Form2();
MainForm _MainForm = new MainForm();

_FirstForm.Close();
_SecondForm.Close();
_MainForm.Show();

Answer 6

在Form2中使用它

private void button1_Click(object sender, EventArgs e)
        {
            Form1.FromHandle(this.Handle);
        }

现在Handle是一样的; 希望这项工作。

单击即可关闭多个窗口

6 个答案: