看到这篇文章，关闭指定的IE实例：http://www.c-sharpcorner.com/Code/2002/Mar/CaptRunIEInstances.asp自己想了另一个办法来作先修改注册表：HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Service\\PerfProc\\Performance下的：Disable Performance Counters 的值改为0得到系统当前进程，加入到listBox中：System.Diagnostics.Process[] processOnComputer = System.Diagnostics.Process.GetProcesses();foreach ( System.Diagnostics.Process p in processOnComputer ){    this.listBox1.Items.Add(p.ProcessName);}关闭某个指定的进程：System.Diagnostics.Process[] process = System.Diagnostics.Process.GetProcessesByName(this.listBox1.SelectedItem.ToString());    foreach ( System.Diagnostics.Process p in process) {    p.Kill(); }但是这样会关闭进程的所有实例，比如如果你打开了多个IE，会把所有的IE窗口都关闭。下面实现关闭某个特定的IE实例先声明一个ArrayList：ArrayList windowHandle = new ArrayList();得到指定进程的所有实例，放到一个ListBox中，同时把主窗口的Handle放到ArrayList中：System.Diagnostics.Process[] processOnComputer = System.Diagnostics.Process.GetProcessesByName(this.listBox1.SelectedItem.ToString());   foreach ( System.Diagnostics.Process p in processOnComputer )   {    this.listBox2.Items.Add(p.MainWindowTitle);//在ListBox中显示主窗体的标题    windowHandle.Add(p.MainWindowHandle); }

把指定的进程的主窗口的Handle和ArrayList中的比对，如果符合就关闭  System.Diagnostics.Process[] process = System.Diagnostics.Process.GetProcessesByName(this.listBox1.SelectedItem.ToString());   foreach ( System.Diagnostics.Process p in process )   {    if ( p.MainWindowHandle == (System.IntPtr)(windowHandle[this.listBox2.SelectedIndex]))    {     p.Kill();     this.listBox2.Items.RemoveAt(this.listBox2.SelectedIndex);    }   }  这样可以关闭有主窗体的进程，但是没有主窗体的还不行还请大家多多指教