C#实现单实例运行的方法，也有多种，比如利用 Process 查找进程的方式，利用 API findwindow 查找窗体的方式，还有就是 利用 Mutex 原子操作，上面几种方法中， 综合考虑利用 Mutex 的方式是较好的选择。
[STAThread]
static void Main()
{
bool isAppRunning = false;
System.Threading.Mutex mutex = new System.Threading.Mutex(
true,
System.Diagnostics.Process.GetCurrentProcess().ProcessName,
out isAppRunning);
if (!isAppRunning)
{
MessageBox.Show("本程序已经在运行了，请不要重复运行！");
Environment.Exit(1);
}
else
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
使用Process 查找进程的方式会报错：System.ComponentModel.Win32Exception 中第一次偶然出现的“System.dll”类型的异常
原因可能是因为：
有些进程，如：system 系统空闲进程，当前程序没有权限获取相关信息或有些程序没有process.MainModule.FileName这些属性
示例代码:
bool result = false;
try
{
Process me = Process.GetCurrentProcess();
Process[] us = Process.GetProcesses();
Process another = null;
foreach (var p in us)
{
try
{
if (p.Id != me.Id && p.MainModule.FileName == me.MainModule.FileName)
{
another = p;
break;
}
}
catch (Exception ex)
{
logger.Error(ex);
}
}
if (another != null)
{
MessageBox.Show("程序已运行", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Question);
result = true;
}
}
catch (Exception e)
{
MessageBox.Show(e.StackTrace+“\n”+ e.Message);
result = true;
}
return result;.csharpcode, .csharpcode pre
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http://xxinside.blogbus.com/logs/47162540.html
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