使用WindowsFormsApplicationBase实现引导界面

1.需要添加对Microsoft.VisualBasic 引用,

2.准备frmMain,frmSplash两个窗口

说明:
        frmSplash在主线程上建立，但是在独立线程上进行消息循环
        当protected override void OnCreateMainForm  方法执行完毕，会隐藏frmSplash
        可以在OnCreateMainForm中执行预加载操作，或者在frmMain的构造里执行，不要在frmMain的OnLoad事件中进行
        当需要改边frmSplash窗体上控件属性时（如显示加载提示等）需要使用控件的Invoke

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace SplashLoader
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(String[] args)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            new SplashApp().Run(args);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.VisualBasic.ApplicationServices;
using System.Diagnostics;
using System.Windows.Forms;
using System.IO;
using System.Threading;
using System.Reflection;
using System.Configuration;
using ISplashLoader;

namespace SplashLoader
{
    public class SplashApp : WindowsFormsApplicationBase
    {

        private frmSplash _frmSplash = null;

        protected override void OnCreateSplashScreen()
        {
            //在主UI线程上运行
            Console.WriteLine("OnCreateSplashScreen:" + Thread.CurrentThread.ManagedThreadId);
            //这里调用是在主线程上的
            //但是SplashForm的消息循环是在独立线程上的
            //可以在SplashForm的OnLoad事件中看到是一个独立的线程
            //因此OnCreateMainForm即使阻塞了，SplashForm也能正常绘制
            //可以把数据初试化操作放在frmMain的构造函数中
            //但是不要放在OnLoad事件中，因为在OnLoad时UI界面已经绘制完成
            //如果在里面放置一些阻塞型的操作会导致界面卡死
            //SplashForm在frmMain的OnLoad调用时隐藏（没有发现调用close事件--会有短暂延迟)
            //
            _frmSplash = new frmSplash();
            SplashScreen = _frmSplash;

            SplashScreen.ShowInTaskbar = false;
            SplashScreen.Cursor = System.Windows.Forms.Cursors.AppStarting;
        }

        private bool CheckUpgrade()
        {
            if (this.CommandLineArgs.Count > )
            {
                if (string.Compare(CommandLineArgs[], "Upgrade:Skip", true) == )
                {
                    return false;
                }
            }
            return true;
        }
        protected override void OnCreateMainForm()
        {
            try
            {

                //在主UI线程上运行
                Console.WriteLine("OnCreateMainForm:" + Thread.CurrentThread.ManagedThreadId);

                //注意使用SplashForm 后，可以在主窗体的构造中加载数据
                //或者在SplashApp的OnCreateMainForm()中，不要放在frmMain的OnLoad事件中

                if (CheckUpgrade())
                {

                    _frmSplash.SetTips("检测是否有新的版本...");

                    Process pa = new Process();
                    pa.StartInfo.UseShellExecute = false;
                    pa.StartInfo.FileName = Path.Combine(Application.StartupPath, @"UpdateApp.exe");
                    pa.StartInfo.Arguments = "AppStart";
                    pa.Start();
                    while (!pa.HasExited) ;

                }

                String assembley = ConfigurationManager.AppSettings["MainAssembly"];
                String type = ConfigurationManager.AppSettings["MainForm"];
                MainForm = CreateForm(assembley, type, _frmSplash);

            }
            catch (Exception e)
            {
                //处理动态加载过程中的异常
                MessageBox.Show(e.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

        }

        /// <summary>
        /// 动太加载窗体
        /// </summary>
        /// <param name="assembly">如:FIStudio.WinUI.(exe|dll)</param>
        /// <param name="type">FIStudio.WinUI.UI.frmCooperatorMgr</param>
        /// <returns></returns>
        private Form CreateForm(String assembly,String type,ILoadTips loadTips)
        {
            String  a = System.IO.Path.GetFileNameWithoutExtension(assembly);
            Type  t = Assembly.Load(a).GetType(type, true);
            Form frm = Activator.CreateInstance(t, new Object[] { loadTips }) as Form;
            return frm;
        }

    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using ISplashLoader;

namespace SplashLoader
{
    public partial class frmSplash : Form ,ILoadTips
    {
        public frmSplash()
        {
            InitializeComponent();
            BackgroundImageLayout = ImageLayout.Stretch;
            FormBorderStyle = FormBorderStyle.None;
            StartPosition = FormStartPosition.CenterScreen;
            Console.WriteLine("SplashForm:" + Thread.CurrentThread.ManagedThreadId);
        }
        delegate void SetTipsHandle(String tips);
        public void SetTips(String tips)
        {
            if (lblTips.InvokeRequired)
            {
                lblTips.Invoke(new SetTipsHandle(SetTips), tips);
            }
            else
            {
                lblTips.Text = tips;
            }
        }
        private void frmSplash_Load(object sender, EventArgs e)
        {
            Console.WriteLine("SplashForm_Load:" + Thread.CurrentThread.ManagedThreadId);
        }
    }
}

Demo:参考华为网盘/软件测试与任务/引导窗体