winform

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WinApp01_Eason
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //
        // 窗口最大化
        private void btnMaxWindow_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Maximized;
        }
        //
        // 窗口恢复
        private void btnNormalWindow_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Normal;
        }
        //
        // 窗口最小化
        private void btnMinWindow_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
        }
        //
        // 创建frmHello窗口
        private void btnShowHello_Click(object sender, EventArgs e)
        {
            frmHello fmhello = new frmHello();
            fmhello.Show();
        }
        //
        // 退出程序
        private void btnAppExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
        //
        // 显示隐藏的窗体
        private void btnCloseHideWindow_Click(object sender, EventArgs e)
        {
            /***********************************************************************
             *  方法1 :
             // 遍历打开的窗体并转换成数组赋值给forms
            Form[] forms = Application.OpenForms.Cast<Form>().ToArray();
            foreach (Form frm in forms)
            {
                // 如果当前窗口可视为假,说明当前窗口是隐藏的
                if (false == frm.Visible)
                {
                    // 那么就显示窗口
                    frm.Visible = true;
                }
            }
            
            ***********************************************************************/

            //方法2
            foreach ( Form hideform in Application.OpenForms)
            {
                if (null != hideform && false == hideform.Visible)
                {
                    hideform.Visible = true;
                }
            }
            
        }
    }
}