显示msgbox，要求在尝试打开新的子窗体时关闭打开的子窗体

问题描述

我的申请中有12个表格.我想显示一个消息框，要求用户在打开其他窗体之前先关闭现有的打开的子窗体.

我尝试了以下代码:

Hi,

I m having 12 forms in my application. I want to display a message box asking the user to close the existing opened child form before opening other.

I had tried the following the code:

Form curfrm;

String a = " Please Close other open window ";

private void admissionForm1ToolStripMenuItem_Click(object sender, EventArgs e)
       {
           adfrm1 af1 = new adfrm1(null);
           if (curfrm != null)
           {
               MessageBox.Show(a);
               return;
           }
           else
           {
               curfrm = af1;
               af1.MdiParent = this;
               af1.Show();
           }

这不允许我在关闭子窗体后再打开其他窗体.

谢谢.

This doesn''t allow me to open the other forms after closing the child form.

Thanks.

推荐答案

if GlobalToken = "" then
    GlobalToken = CurrentForm.Name
else
    Show Message
end if

在所有子窗体上，使用析构函数"清除令牌-

On all the child forms'' destructor clear the token -

GlobalToken = ""

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