关于多线程操作的问题

[chuzhongbiyewenhua]

一个登录程序，连接数据库的部分可能要几秒时间，怎么程序在这段时间内有个一个等待的画面，等连接上了，出了结果了再把这画面取消。谢谢大家。

[healer_kx]

这个是线程比较基本的用法。。。 。。。

[mawei0313]

mark

[兔子-顾问]

Form waitForm = null;
new Thread((ThreadStart)delegate
    {
        waitForm = new Form();
        Application.Run(waitForm);
    }).Start();
//执行你的操作
waitForm.Invoke((EventHandler)delegate { waitForm.Close(); });

[daone]

新建个类就是等待的窗口

public partial class SplashFrm : Form
    {
        public SplashFrm()
        {
            InitializeComponent();
        }
        private string _StatusInfo = "";
                
        //开始登陆前的加载信息
        public string StatusInfo
        {
            set
            {
                _StatusInfo = value;
                ChangeStatusText();
            }
            get
            {
                return _StatusInfo;
            }
        }

        public void ChangeStatusText()
        {
            try
            {
                if (this.InvokeRequired)
                {
                    this.Invoke(new MethodInvoker(this.ChangeStatusText));
                    return;
                }

                this.lbStatus.Text = _StatusInfo;
            }
            catch (Exception e)
            {
                throw e;
            }
        }
    }

对应的一个线程操作类

public class Splash
    {
        //声明加载页
        static SplashFrm MySplashForm = null;
        //声明加载线程
        static Thread MySplashThread = null;

        static void ShowThread()
        {
            MySplashForm = new SplashFrm();
            Application.Run(MySplashForm);
        }
        /// <summary>
        /// 显示加载页
        /// </summary>
        static public void Show()
        {
            if (MySplashThread != null)
                return;

            MySplashThread = new Thread(new ThreadStart(Splash.ShowThread));
            MySplashThread.IsBackground = true;
            MySplashThread.SetApartmentState(ApartmentState.STA);
            MySplashThread.Start();
        }
        /// <summary>
        /// 关闭加载页
        /// </summary>
        static public void Close()
        {
            if (MySplashThread == null) return;
            if (MySplashForm == null) return;

            try
            {
                MySplashForm.Invoke(new MethodInvoker(MySplashForm.Close));
            }
            catch (Exception)
            {
            }
            MySplashThread = null;
            MySplashForm = null;
        }
        /// <summary>
        /// 加载页状态
        /// </summary>
        static public string Status
        {
            set
            {
                if (MySplashForm == null)
                {
                    return;
                }

                MySplashForm.StatusInfo = value;
                
            }
            get
            {
                if (MySplashForm == null)
                {
                    throw new InvalidOperationException("Splash Form not on screen");
                }
                return MySplashForm.StatusInfo;
            }
        }
    }

最后main函数里

            int intervalTime = 1200;
            //显示加载页(新线程)
            Login.Splash.Show();

            Login.Splash.Status = "状态：正在加载配置文件。。。";
            Thread.Sleep(intervalTime);
            loadConfig();
            Thread.Sleep(intervalTime);
            
            Login.Splash.Status = "状态：正在测试连接数据库。。。";
            Thread.Sleep(intervalTime);
            ConnectDataBase();
            Thread.Sleep(intervalTime);
            //关闭加载页
            Login.Splash.Close();

[yuxiangq]

学习了