启用和禁用的形式在C# [英] Enabling and disabling forms in C#
问题描述
我已经创建了两种形式在C#中:form1中的主要应用和窗口2是一个登录窗口。 Form1中有一个按钮,关闭本身并显示窗口2和窗口2有按钮,使主窗体和关闭本身。问题是,当我尝试使用窗口2按钮启用Form1中(我得到类型的未处理的异常System.NullReferenceException
发生在Application.exe)
下面是在Form1 code:
登录登录=新的登录();
Login.Show();
this.Enabled = FALSE;
窗口2(登录)code:
(this.Owner为Form1).Enabled = TRUE; ===>这条线被强调
关闭();
您可以使用的 的ShowDialog
,这将在使所有其他形式的inaccessable(同样适用)展示的形式是:
使用(VAR登录=新的登录()){
login.ShowDialog(本);
}
你还可以通过的 的DialogResult
值,作为返回code,传递成功或失败的调用方法。
I have created two forms in C#: form1 is the main application and form2 is a logon window. form1 has a button that disable itself and show form2 and form2 has button that enable the main form and closes itself. The problem is when I try to enable form1 using a form2 button (I get "An unhandled exception of type 'System.NullReferenceException'
occurred in Application.exe")
Here is the form1 code:
Login Login = new Login();
Login.Show();
this.Enabled = false;
form2(Login) code:
(this.Owner as Form1).Enabled = true; ===> this line gets highlighted
Close();
You could use ShowDialog
, this will make all other forms (of the same application) inaccessable during the show of the form:
using (var login = new Login()) {
login.ShowDialog(this);
}
And you can pass one of the DialogResult
values, as the return code, to pass success or failure to the calling method.
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