用C#给程序加启动画面并只允许一个应用程序实例运行

、   启动画面类：
    public class SplashForm : System.Windows.Forms.Form
    {
        private System.Windows.Forms.PictureBox pictureBox1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label lbl_version;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        public SplashForm()
        {
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();
            lbl_version.Text = "版本：" + Application.ProductVersion;

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }
        //以下省略
、  应用程序加载类：
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Reflection;
using System.IO;

namespace Heroic.TempAnalyse.TempGui
{
    /// <summary>
    /// AppLoader 的摘要说明。
    /// </summary>
    public class AppLoader
    {
        private static ApplicationContext context;
        private static SplashForm sForm = new SplashForm();
        private static MainWindow mForm = null;
        //0不可见但仍然运行,1居中,2最小化,3最大化
        private const int WS_SHOWNORMAL = ; 

        [STAThread]
        static void Main(string[] args)
        {
            //  [8/12/2004]用于更新该程序。
            doUpData();
            //  [7/19/2004] 改变顺序,目的使得开始加载速度加快
            //得到正在运行的例程
            Process instance = RunningInstance();
            if(instance == null)
            {
                sForm.Show();
                mForm = new MainWindow();
                context = new ApplicationContext();
                Application.Idle += new EventHandler(OnAppIdle);
                Application.Run(context);
            }
            else
            {
                //处理发现的例程
                HandleRunningInstance(instance);
                //MessageBox.Show("当前程序已经运行了!");
            }
        }
        //在线更新用，不再本文范围
        private static void doUpData()
        {
            System.Diagnostics.Process.Start(Application.StartupPath+@"\update.exe",Application.StartupPath+@"\Heroic.TempAnalyse.TempGui.exe 0");//
        }

        private static void OnAppIdle(object sender, EventArgs e)
        {
            if(context.MainForm == null)
            {
                Application.Idle -= new EventHandler(OnAppIdle);
                mForm.PreLoad();
                context.MainForm = mForm;
                context.MainForm.Show();
                sForm.Close();
                sForm = null;
            }
        }
        //不允许有两个程序同时启动
        public static Process RunningInstance()
        {
            Process current = Process.GetCurrentProcess();
            Process[] processes = Process.GetProcessesByName (current.ProcessName);
            //遍历正在有相同名字运行的例程
            foreach (Process process in processes)
            {
                //忽略现有的例程
                if (process.Id != current.Id)
                {
                    //确保例程从EXE文件运行
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") ==
                        current.MainModule.FileName)
                    {
                        //返回另一个例程实例
                        return process;
                    }
                }
            }
            //没有其它的例程，返回Null
            return null;
        } 

        public static void HandleRunningInstance(Process instance)
        {
            //确保窗口没有被最小化或最大化
            ShowWindowAsync (instance.MainWindowHandle , WS_SHOWNORMAL); 

            //设置真实例程为foreground window
            SetForegroundWindow (instance.MainWindowHandle);
        } 

        [DllImport("User32.dll")] 

        private static extern bool ShowWindowAsync(
            IntPtr hWnd, int cmdShow);
        [DllImport("User32.dll")] private static extern bool
            SetForegroundWindow(IntPtr hWnd);
    }
}
、  加载完毕正式运行后的类：
        public void PreLoad()
        {
            //    如果已经加载毕，则返回
            if (_Loaded)
                return;

            //    把机器生成的代码放到这里
            initCustomControl();

            _Loaded = true;

        }

        //    是否加载完毕
        private bool _Loaded = false;

        protected override void OnLoad(EventArgs e)
        {
            //    确保 PreLoad()函数已经调用
            if (!_Loaded)
                throw new InvalidOperationException("Must call PreLoad before calling this function.");

        }

C#只能运行一个winForm进程
[STAThread]
   static void Main()
   {
            Process instance = RunningInstance();
            if (instance == null)
            {
                System.Windows.Forms.Application.EnableVisualStyles();    //这两行可以让窗体具有XP风格.
                System.Windows.Forms.Application.DoEvents();
                Application.Run(new ClientForm());
            }
            else
            {
                HandleRunningInstance(instance);
            }
   }
#region   只运行一个实例
public static Process RunningInstance()
{
Process current = Process.GetCurrentProcess();
Process[] processes = Process.GetProcessesByName (current.ProcessName);
//遍历与当前进程名称相同的进程列表
foreach (Process process in processes)
{
//Ignore the current process
if (process.Id != current.Id)
{
//Make sure that the process is running from the exe file.
if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
{
//Return the other process instance.
return process;
}
}
}
return null;
}
private static void HandleRunningInstance(Process instance)
{
MessageBox.Show("该应用系统已经在运行！","提示信息",MessageBoxButtons.OK,MessageBoxIcon.Information);
ShowWindowAsync(instance.MainWindowHandle,WS_SHOWNORMAL); //调用api函数，正常显示窗口
SetForegroundWindow(instance.MainWindowHandle); //将窗口放置最前端。
}
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(System.IntPtr hWnd, int cmdShow);
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(System.IntPtr hWnd);
private const int WS_SHOWNORMAL = ;
#endregion 

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