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using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace frmMain
{
static class Program
{
private const int WS_SHOWNORMAL = 1;
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Process instance = GetRunningInstance();
if (instance == null)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new frmMain());
}
else
{
HandleRunningInstance(instance);
}
}
/// <summary>
/// 获取当前是否具有相同进程。
/// </summary>
/// <returns></returns>
public static Process GetRunningInstance()
{
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 (System.Reflection.Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
return process;
}
return null;
}
/// <summary>
/// 激活原有的进程。
/// </summary>
/// <param name="instance"></param>
public static void HandleRunningInstance(Process instance)
{
ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL);
SetForegroundWindow(instance.MainWindowHandle);
}
}
}
bool isfind = false;
foreach (Form f in Application.OpenForms)
{
if(f.GetType() == typeof(MyForm))
{
isfind = true;
//说明找到了,做对应的处理,然后跳出循环
break;
}
}
[STAThread]
bool isRuned ;
try
{
System.Threading.Mutex mutex = new System.Threading.Mutex(true,"OnlyRunOneInstance", out isRuned);
if (isRuned)
{
Form frm = new Form();
if (frm.IsDisposed == false)
Application.Run(frm);
mutex.ReleaseMutex();
Application.Exit();
}
else
{
MessageBox.Show("已启动!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
catch (Exception e)
{
}
试试这个 public partial class Form2 : Form
{
static int showCount=0;
public Form2()
{
if (showCount < 1)
{
showCount++;
}
else
{
this.Close();
}
InitializeComponent();
}
private void Form2_FormClosed(object sender, FormClosedEventArgs e)
{
showCount = 0;
}