C＃ Winform 最大化遮挡任务栏和全屏显示问题

在打开最大化窗体时，如果不进行配置，那么默认情况下窗体是被任务栏档住，导致有部分界面看不见，看看下面代码的效果，也许对你有帮助

新建一个Winform项目，添加三个按钮，给三个按钮添加点击事件

代码：

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 Test5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private Size WindowMaximumSize;

        private void Form1_Load(object sender, EventArgs e)
        {
            WindowMaximumSize = this.MaximumSize;
            this.TopMost = true;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //任务栏不会被遮挡
            if (this.WindowState == FormWindowState.Maximized)
            {
                this.WindowState = FormWindowState.Normal;
            }
            else
            {
                this.WindowState = FormWindowState.Maximized;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //任务栏会被遮挡
            if (this.WindowState == FormWindowState.Maximized)
            {
                this.FormBorderStyle = FormBorderStyle.FixedSingle;
                this.WindowState = FormWindowState.Normal;
            }
            else
            {
                this.FormBorderStyle = FormBorderStyle.None;
                this.MaximumSize = WindowMaximumSize;
                this.WindowState = FormWindowState.Maximized;
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            //任务栏不会被遮挡
            if (this.WindowState == FormWindowState.Maximized)
            {
                this.FormBorderStyle = FormBorderStyle.FixedSingle;
                this.WindowState = FormWindowState.Normal;
            }
            else
            {
                this.FormBorderStyle = FormBorderStyle.FixedSingle;
                this.MaximumSize = new Size(Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height);
                this.WindowState = FormWindowState.Maximized;
            }
        }

    }
}

效果：

点击按钮1，会最大化，但窗体不会遮挡任务栏，

点击按钮2，会全屏显示，

点击按钮3，会最大化，但窗体不会遮挡任务栏，

end