C# Winform Forms 关闭和打开一个新表单
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Winform Forms Closing and opening a new form
提问by Karthick
1. frmHome frm = new frmHome();
frm.Show();
this.Close();
I'm opening HomeFormfrom LoginForm. In LoginForm's form_closedevent I call Application.Exit(). This allows you to open LoginFormand exit the application by clicking the Xbutton.
我HomeForm从LoginForm. 在LoginForm的form_closed情况下我的呼叫Application.Exit()。这允许您LoginForm通过单击X按钮打开和退出应用程序。
The problem is when I move from LoginFormto HomeFormand call this.Close(), the form_closedevent of LoginFormtriggers and the application gets closed.
问题是当我从LoginFormto移动到HomeForm并调用时this.Close()，触发器form_closed事件LoginForm和应用程序被关闭。
I am allowed to show only one form at a time.
我一次只能展示一种表格。
回答by Aaron Daniels
One way to accomplish this:
实现此目的的一种方法：
- Open the main form on startup.
- Hide it. (optional really, but not for you if you really can't show more than one form.)
- Open your login form with ShowDialog();
- If login is successful, then show your main form. If not, then close your main form / the application.
- 在启动时打开主窗体。
- 把它藏起来。（确实是可选的，但如果您真的不能显示多个表格，则不适合您。）
- 使用 ShowDialog() 打开您的登录表单；
- 如果登录成功，则显示您的主表单。如果没有，请关闭您的主表单/应用程序。
回答by manji
you can use a boolean (global variable) as exit flag in LoginForm
您可以使用布尔值（全局变量）作为退出标志 LoginForm
initialize it to :
将其初始化为：
exit = true;//in constructor
set it to false before closing:
在关闭之前将其设置为 false：
frmHome frm = new frmHome();
frm.Show();
exit = false;
this.Close();
and in form_closed:
并在form_closed：
if(exit) Application.Exit();
if a user closes the form with the 'X'button, exitwill have the value true, and Application.Exit()will be called.
如果用户使用'X'按钮关闭表单，exit将具有值true，并Application.Exit()会被调用。
EDIT:
编辑：
the above is not working because LoginFormis your main form used by Application.Run(loginForm).
以上不起作用，因为LoginForm您的主要形式是Application.Run(loginForm).
2 suggestions:
2 建议：
With exitflag:
带exit标志：
replace
代替
Application.Run(new LoginForm())
by
经过
LoginForm loginFrm = new LoginForm();
loginFrm.Show();
Application.Run();
Without exitflag:
无exit标志：
replace in your current code:
替换您当前的代码：
frmHome frm = new frmHome();
frm.Show();
this.Close();
by
经过
frmHome frm = new frmHome();
this.Visible = false;
frm.ShowDialog();
this.Close();
回答by Glenn
Why don't you just stop calling application.exit in the form_closed event?
为什么不停止在 form_closed 事件中调用 application.exit 呢？
I am not sure that you really need it anyway, and if you do then you can remove the x icon from the screen and give them a close button.
我不确定你是否真的需要它，如果你这样做了，那么你可以从屏幕上删除 x 图标并给他们一个关闭按钮。
Alternatively there is a CloseReason in the event args that will tell you if it is a user closing the form or code or something else.
或者，事件 args 中有一个 CloseReason，它会告诉您是否是用户关闭表单或代码或其他内容。
回答by AngryHacker
In program.cs:
在 program.cs 中：
void Main() {
frmLogin fl = new frmLogin();
if (fl.ShowModal() == DialogResult.Ok) {
frmHome fh = new frmHome();
fh.Show();
}
}
回答by davidsleeps
I'm not quite sure I'm understanding this, perhaps you could do something like this if you want to loop through a specific order of forms: (pseudo code)
我不太确定我是否理解这一点，如果您想遍历特定的表单顺序，也许您可以这样做：（伪代码）
Dim formsList as New List(Of form)
formsList.add(Form1)
formsList.add(Form2)
formsList.add(Form3)
' etc etc etc '
For Each f as Form in formsList
f.ShowDialog()
' you could have a condition here which breaks the for loop perhaps '
Next
Me.close ' close the app '
You could add a condition into the For loop which breaks the for loop to end early...
您可以在 For 循环中添加一个条件，该条件会中断 for 循环以提前结束...
note: sorry for the vb.net code...but it should be easy to understand though
注意：对不起 vb.net 代码......但它应该很容易理解
回答by Skintkingle
you can force the form to hide, instead of close. instead of catching the form_closed event, catch the form_closing event. it would look something like this.
您可以强制表单隐藏，而不是关闭。与其捕获 form_closed 事件，不如捕获 form_closed 事件。它看起来像这样。
private void LoginFrm_Closing(object sender, FormClosingEventArgs e)
{
e.Cancel = true;
this.Hide();
frmHome frm = new frmHome();
frm.Show();
}
this will keep both open, but only one visible. somewhere in frmHome, possibly a public variable to hold the LoginFrm, so you can toggle between the two with Hide(); and Show(); (and any other forms you may wish to add)
这将使两者保持打开状态，但只有一个可见。frmHome 中的某个地方，可能是一个公共变量来保存 LoginFrm，因此您可以使用 Hide() 在两者之间切换；和显示（）；（以及您可能希望添加的任何其他表格）
Edit: Grammar.
编辑：语法。
回答by Rohan Loomis
All you need to do is this it closes the 2 forms without problem. Form1 fin = new Form1(); fin.Close(); this.Visible = false; Form2 win = new Form2(); win.Visible = true;
您需要做的就是它可以毫无问题地关闭 2 个表单。Form1 鳍 = 新 Form1(); fin.Close(); this.Visible = false; Form2 win = new Form2(); win.Visible = true;
回答by Ahmed Tarek
try that it might help you
尝试它可能会帮助你
frmHome frm = new frmHome();
this.hide()
frm.ShowDialog();
this.Close();
