C# 自定义弹窗提醒

    classShaderBox
    {
        privateForm _shader;
        privateForm _parent;
        privateForm _child;

        publicShaderBox(Form parent, Form child)
        {
            _parent =parent;
            _child =child;

            _shader = newForm()
            {
                Owner =_parent,
                Location =_parent.Location,
                Size =_parent.Size,
                BackColor =System.Drawing.Color.DimGray,
                //DoubleBuffered = true,
                FormBorderStyle =FormBorderStyle.None,
                Opacity = 0.8D,
                ShowInTaskbar = false,
                StartPosition =FormStartPosition.CenterParent
            };
            _child.Owner =_shader;
            _child.MaximumSize = new System.Drawing.Size(_shader.Width * 80 / 100, _shader.Height * 80 / 100);
            _child.Font =_parent.Font;

            _shader.Shown +=Shader_Shown;
        }

        public voidShow()
        {
            _shader.Show();
            _shader.Location =_parent.Location;
            _shader.BringToFront();
        }

        public voidHide()
        {
            _shader.Hide();
        }

        public voidClose()
        {
            _shader.Close();
        }

        private void Shader_Shown(objectsender, EventArgs e)
        {
            _child.Show();

            int x = _shader.Left + (_shader.Width - _child.Width) / 2;
            int y = _shader.Top + (_shader.Height - _child.Height) / 2;
            _child.Location = newSystem.Drawing.Point(x, y);

            _child.BringToFront();
        }
    }

    classWaitBox : Form
    {
        private Label _lblMsg = null;
        private Timer _timer = null;
        private Label _lblElapsed = null;
        private long _elapsed = 0;

        /// <summary>
        ///消息
        /// </summary>
        public stringMsg
        {
            get =>_lblMsg.Text;
            set => _lblMsg.Text =value;
        }

        publicWaitBox()
        {
            Init();

            FontChanged +=WaitBox_FontChanged;
        }

        private void WaitBox_FontChanged(objectsender, EventArgs e)
        {
            _lblMsg.Font =Font;
        }

        private voidInit()
        {
            Width = 400;
            Height = 70;
            FormBorderStyle =FormBorderStyle.None;
            AutoScaleMode =AutoScaleMode.None;
            ShowInTaskbar = false;
            Shown +=WaitBox_Shown;

            _lblElapsed = newLabel
            {
                Dock =DockStyle.Top,
                TextAlign =ContentAlignment.MiddleRight,
                Text = "",
                ForeColor =Color.Blue,
                Font = newFont(SystemFonts.DefaultFont, FontStyle.Regular),
                Parent = this};
            Controls.Add(_lblElapsed);

            _lblMsg = newLabel
            {
                Dock =DockStyle.Fill,
                TextAlign =ContentAlignment.MiddleCenter,
                Text = "请等待...",
                Parent = this};
            Controls.Add(_lblMsg);

            _timer = newTimer();
            _timer.Interval = 1000;
            _timer.Tick +=_timer_Tick;
        }

        private void WaitBox_Shown(objectsender, EventArgs e)
        {
            _timer.Start();
        }

        private void _timer_Tick(objectsender, EventArgs e)
        {
            _elapsed++;
            _lblElapsed.Text = string.Format("{0}s", _elapsed);
        }
    }

    classWaitHelper
    {
        private static ShaderBox _shaderBox = null;
        private static WaitBox _childBox = null;

        /// <summary>
        ///等待开始
        /// </summary>
        /// <param name="parent">父窗体</param>
        /// <param name="msg">提示消息</param>
        public static void WaitBegin(Form parent, stringmsg)
        {
            _childBox = newWaitBox
            {
                Msg =msg
            };
            _shaderBox = newShaderBox(parent, _childBox);
            _shaderBox.Show();
            Application.DoEvents();
        }
        /// <summary>
        ///实时更新消息
        /// </summary>
        /// <param name="msg"></param>
        public static void WaitUpdate(stringmsg)
        {
            _childBox.Msg =msg;
        }
        /// <summary>
        ///等待结束
        /// </summary>
        public static voidWaitEnd()
        {
            _shaderBox.Close();
            _shaderBox = null;
            _childBox = null;
        }
    }

        private void button1_Click(objectsender, EventArgs e)
        {
            WaitHelper.WaitBegin(this, "你好，我的朋友！");
            for (int q = 0; q < 100000; q++)
            {
                textBox1.Text =q.ToString();
                Application.DoEvents();//实时响应文本框中的值

                //WaitHelper.WaitUpdate(q.ToString());
}
            WaitHelper.WaitEnd();
        }