用C#给程序加启动画面并只允许一个应用程序实例运行

1、   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
2、  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 = 3;

[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);
}
}
3、  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 = 1;
#endregion