C#避免程序二次启动并接收参数

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Reflection;
namespace gis
{
static class Program
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main(string[] args)
{
//如果有参数，执行以下内容
if (args.Length > 0)
{
MessageBox.Show(args[0]);
}
bool createdNew;
//系统能够识别有名称的互斥，因此可以使用它禁止应用程序启动两次
//第二个参数可以设置为产品的名称:Application.ProductName
//每次启动应用程序，都会验证名称为Gis的互斥是否存在
Mutex mutex = new Mutex(false, "Gis", out createdNew);
//如果已运行，则在前端显示
//createdNew == false，说明程序已运行
if (!createdNew)
{
Process instance = GetExistProcess();
if (instance != null)
{
SetForegroud(instance);
Application.Exit();
return;
}
}
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
if (args.Length == 0)
Application.Run(new Form1());
else
Application.Run(new Form1(args));
}
/// <summary>
/// 查看程序是否已经运行
/// </summary>
/// <returns></returns>
private static Process GetExistProcess()
{
Process currentProcess = Process.GetCurrentProcess();
foreach (Process process in Process.GetProcessesByName(currentProcess.ProcessName))
{
if ((process.Id != currentProcess.Id) &&
(Assembly.GetExecutingAssembly().Location == currentProcess.MainModule.FileName))
{
return process;
}
}
return null;
}
/// <summary>
/// 使程序前端显示
/// </summary>
/// <param name="instance"></param>
private static void SetForegroud(Process instance)
{
IntPtr mainFormHandle = instance.MainWindowHandle;
if (mainFormHandle != IntPtr.Zero)
{
ShowWindowAsync(mainFormHandle, 1);
SetForegroundWindow(mainFormHandle);
}
}
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
}
}