WinForm界面开发之 启动界面

咱们在开发桌面应用程序的时候，因为程序启动比较慢，每每为了提升用户的体验，增长一个闪屏，也就是SplashScreen，好处有：一、让用户看到加载的过程，提升程序的交互响应；2.能够简短展现或者介绍程序的功能或者展现Logo，给客户较深的印象。

本人在开发的共享软件中，对于启动比较慢的程序，也倾向于引入这个控件来展现下，先看看软件启动的时候的效果

中间的那些文字“正在初始化应用程序......”能够根据加载的进度显示不一样的内容，固然最好简单扼要了，其余的内容你也能够视须要作相应变化，由于这个是一个Form，你想改变什么就改变什么的。

看看闪屏代码如何使用先，首先咱们在入口的Main函数中开始

    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

              
            //登录界面
            FrmLogin dlg = new FrmLogin();
            dlg.StartPosition = FormStartPosition.CenterScreen;
            if (DialogResult.OK == dlg.ShowDialog())
            {
             
                   SplashScreen.Splasher.Show(typeof(SplashScreen.FrmSplashScreen));

                  Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);
                  Application.Run(new FrmMain());
            }


           
        }

        private static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs ex)
        {
            //LogHelper.Error(ex.Exception);

            string message = string.Format("{0}\r\n操做发生错误，您须要退出系统么？", ex.Exception.Message);
            if (DialogResult.Yes ==MessageBox.Show(message,"系统错误",MessageBoxButtons.YesNo))
            {
                Application.Exit();
            }
        }
    }

上面代码中：SplashScreen.Splasher.Show(typeof(SplashScreen.frmSplash));主要为启动闪屏类代码，

其中 Splasher 这个类当中使用后台线程，反射来实例化窗体，代码以下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Reflection;

namespace SplashScreen
{
    public class Splasher
    {
        private static Form m_SplashForm = null;
        private static ISplashForm m_SplashInterface = null;
        private static Thread m_SplashThread = null;
        private static string m_TempStatus = string.Empty;

        /// <summary>
        /// Show the SplashForm
        /// </summary>
        public static void Show(Type splashFormType)
        {
            if (m_SplashThread != null)
                return;
            if (splashFormType == null)
            {
                throw (new Exception("splashFormType is null"));
            }

            m_SplashThread = new Thread(new ThreadStart(delegate()
            {
                CreateInstance(splashFormType);
                Application.Run(m_SplashForm);
            }));

            m_SplashThread.IsBackground = true;
            m_SplashThread.SetApartmentState(ApartmentState.STA);
            m_SplashThread.Start();
        }



        /// <summary>
        /// set the loading Status
        /// </summary>
        public static string Status
        {
            set
            {
                if (m_SplashInterface == null || m_SplashForm == null)
                {
                    m_TempStatus = value;
                    return;
                }

                m_SplashForm.Invoke(
                        new SplashStatusChangedHandle(delegate(string str) { m_SplashInterface.SetStatusInfo(str); }),
                        new object[] { value }
                    );
            }

        }

        /// <summary>
        /// Colse the SplashForm
        /// </summary>
        public static void Close()
        {
            if (m_SplashThread == null || m_SplashForm == null) return;

            try
            {
                m_SplashForm.Invoke(new MethodInvoker(m_SplashForm.Close));
            }
            catch (Exception)
            {
            }
            m_SplashThread = null;
            m_SplashForm = null;
        }

        private static void CreateInstance(Type FormType)
        {

            //利用反射建立对象
            object obj = Activator.CreateInstance(FormType);

            m_SplashForm = obj as Form;
            m_SplashInterface = obj as ISplashForm;
            if (m_SplashForm == null)
            {
                throw (new Exception("Splash Screen must inherit from System.Windows.Forms.Form"));
            }
            if (m_SplashInterface == null)
            {
                throw (new Exception("must implement interface ISplashForm"));
            }

            if (!string.IsNullOrEmpty(m_TempStatus))
                m_SplashInterface.SetStatusInfo(m_TempStatus);
        }


        private delegate void SplashStatusChangedHandle(string NewStatusInfo);

    }
}

为了增长启动界面的说明，在启动界面上增长了一个文字接口，能够在外部来修改启动界面上的说明:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SplashScreen
{
    /// <summary>
    /// interface for Splash Screen
    /// </summary>
    public interface ISplashForm
    {
        void SetStatusInfo(string NewStatusInfo);
    }
}

然手在闪屏的窗体上继承接口，并实现相关的接口代码：

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 SplashScreen
{
    public partial class FrmSplashScreen : Form,ISplashForm
    {
        public FrmSplashScreen()
        {
            InitializeComponent();
        }

        //实现接口方法，主要用于接口的反射调用
        #region ISplashForm

        void ISplashForm.SetStatusInfo(string NewStatusInfo)
        {
            lbStatusInfo.Text = NewStatusInfo;
        }

        #endregion
    }
}

而后程序在点击“登陆”按钮后，就能够在主界面上作闪屏界面等待了，frmMain窗体代码：

namespace SplashScreen
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();

            System.Threading.Thread.Sleep(800);
            Splasher.Status = "正在展现相关的内容......";
            System.Threading.Thread.Sleep(800);

            //.......此处加载耗时的代码

            Splasher.Status = "初始化完毕............";
            System.Threading.Thread.Sleep(800);

            Splasher.Close();

        }
    }
}