📅  最后修改于: 2022-03-11 14:49:08.746000             🧑  作者: Mango
// Look through all open forms to see if there is already a Form2 open.
// If it is, Close it. This prevents the user from (purposely) having 5 of the same forms open.
// If you try to cycle through open forms after closing one, it crashes,
// because it edits the list of forms while cycling through it
// This is why it is converted into a list of forms first.
foreach (Form frm in Application.OpenForms.Cast