WinForm禁用窗体自带的关闭功能

1.代码结构

2.实现代码

using System;
using System.Windows.Forms;

namespace WinFormForbidCloseDemo
{
    /// <summary>
    ///     WinForm禁用窗体的关闭按钮
    ///     LDH @ 2018-5-19
    /// </summary>
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
        }

        /// <summary>
        ///     关闭窗体
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnClose_Click(object sender, EventArgs e)
        {
            Environment.Exit(0);
        }

        #region 【WinForm禁用窗体的关闭按钮】

        private const int CP_NOCLOSE_BUTTON = 0x200;

        protected override CreateParams CreateParams
        {
            get
            {
                var myCp = base.CreateParams;
                myCp.ClassStyle = myCp.ClassStyle | CP_NOCLOSE_BUTTON;
                return myCp;
            }
        }

        #endregion
    }
}

3.效果展示