如果打开格式，如何检查表格是否打开？

Question

如何检查表单是否已打开，以及表单是否已打开以关闭表单？

我尝试了下面的代码，测试了一些代码，但它仍然说即使我知道它的形式也没有打开：

 foreach(Form a in Application.OpenForms) 
 {
     if (a is YouLikeHits_Settings) 
     {
         // About form is open
         MessageBox.Show("form open");
         break;
     }
     // About form is not open...
     MessageBox.Show("form not open");
     break;
 }

Answer 1

Application.OpenForms包含已打开的表单。如果此集合中有表单，则会打开它。否则它不会打开（可能已关闭）。

if (Application.OpenForms.OfType<YouLikeHits_Settings>().Any())
    MessageBox.Show("Form is opened");
else
    MessageBox.Show("Form is not opened");

Answer 2

这将确定

setup pod

Answer 3

try
{
    if (Application.OpenForms.OfType<talkForm>().Any())
    {
        talkForm frm = new talkForm();
        frm.Close();
        MessageBox.Show("Form is opened");
    }
    else
    {
        talkForm frm = new talkForm();
        frm.Show();
        MessageBox.Show("Form is not opened");
    }
}
catch(Exception ex)
{

}