MDIChild表单仅打开 [英] MDIChild form open only

问题描述

我创建了具有MDIParent形式和其他形式的应用程序.
Mdiparent允许打开多个表单.不应这样做，应该这样做.
我在下面有表格的示例代码.

I have created application that have MDIParent form and other no of forms.
Mdiparent allowing to open multiple forms. That should not be allowed so should do.
I have sample code for form below.

private void employeeEntryToolStripMenuItem_Click(object sender, EventArgs e)
       {
           frmEmployeeEntry EmpEntry = new frmEmployeeEntry();
           EmpEntry.MdiParent = this;
           EmpEntry.Show();
       }

里面有什么问题.
建议正确的代码.

What''s wrong in it.
Suggest right code pls.
Thanks in advamce.

推荐答案

嗨...

在打开子窗体之前，您应检查是否已打开任何mdichildren窗体，如果是，则将其关闭，如下所示:

hi...

before opening a child form, u should check whether any mdichildren forms are open, and if yes, close them, like below:

foreach(Form frmChild in this.MdiChildren)
{
frmChild.Close();
}

之后，您可以打开新表单.

After this, u can open new form.

在这种情况下输入新的子表单打开代码

put new child form opening code inside this condition

if (MDI.MdiChildren.Length >0)
{
 //message please close form already open
}
else
{
 //open form
}

其他简单的方法，
使用 ShowDialog 注意:在关闭此表单之前，将不允许访问MDI表单.

else simple way,
use ShowDialog note: it will not allow to access MDI form till this form is closed.

frmEmployeeEntry EmpEntry = new frmEmployeeEntry();
EmpEntry.ShowDialog()

祝您编码愉快！
:)

Happy Coding!
:)

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