c# Detailed introduction to hiding open windows and opening login windows

c# Hide the open window and open the login window for a detailed introduction

  FormCollection fc = Application.OpenForms;//获得已打开的窗口
//循环隐藏
            if (fc != null && fc.Count > 0)
            {
                foreach (Form window in fc)
                {
                    window.Hide();
                }
            }
//清空保存的用户信息
            CacheHelper.CurUserName = "";
            CacheHelper.CurUserRole = -1;
//打开登陆窗口
            frmLogin fl = new frmLogin();
            fl.Show();

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