chutian_terminal/MessageBoxForm.cs

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace chutian_parking_terminal
{
    public partial class MessageBoxForm : Form
    {

        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
            if (e.Button == MouseButtons.Left)
            {
                //这里一定要判断鼠标左键按下状态，否则会出现一个很奇葩的BUG，不信邪可以试一下~~
                ReleaseCapture();
                SendMessage(Handle, 0x00A1, 2, 0);
            }
        }

        public MessageBoxForm()//弹窗初始化
        {
            InitializeComponent();

        }
        public void setCenter()//设置位置
        {
            int gLeft = this.Width / 2 - msgBox.Width / 2;
            int gTop = (this.Height / 2 - msgBox.Height / 2) - 20;
            msgBox.Location = new Point(gLeft, gTop);
        }
        public void setText(string text)//设置文本
        {
            this.msgBox.Text = text;
        }
        /// <summary>
        /// 显示窗口，默认为倒计时，时间5秒
        /// </summary>
        /// <param name="text"></param>
        /// <param name="count_down"></param>
        /// <param name="time"></param>
        public void Show(string text, bool is_count_down = true, int time = 5)
        {
            this.msgBox.Text = text;
            this.time_label.Text = time.ToString();
            if (is_count_down)
            {
                count_down(time);
            }
            this.Show();
        }
        /// <summary>
        /// 显示模态窗口，默认不进行倒计时，如果为true，时间默认5秒
        /// </summary>
        /// <param name="text"></param>
        /// <param name="count_down"></param>
        /// <param name="time"></param>
        public void ShowDialog(string text, bool is_count_down = true, int time = 5)
        {
            this.msgBox.Text = text;
            if (is_count_down)
            {
                count_down(time);
            }
            this.ShowDialog();
        }

        //在这里关闭窗口就会报创建窗口句柄msgTextNew != msgBox.Text错误
        private void OKbtn_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        /// <summary>
        /// 倒计时
        /// </summary>
        /// <param name="time"></param>
        private void count_down(int time)
        {
            Task.Factory.StartNew(() =>
            {
                try
                {
                    int i = Convert.ToInt32(time_label.Text);
                    while (i >= 0)
                    {
                        if (this.InvokeRequired)
                        {
                            this.Invoke(new Action(() =>
                            {
                                time_label.Text = i.ToString();
                                if (i <= 0)
                                    this.Close();
                            }));
                        }
                        else
                        {
                            time_label.Text = i.ToString();
                            if (i <= 0)
                                this.Close();
                        }
                        i--;
                        Thread.Sleep(1000);
                    }
                }
                catch (Exception e)
                { }
            });
        }

    }
}