c# - process.MainWindowHandle 为零？

Question

为什么 process.MainWindowHandle 在下面的代码中为零？

Process me = Process.GetCurrentProcess();
foreach (Process process in Process.GetProcessesByName(me.ProcessName))
                    {
                        if (process.Id != me.Id)
                        {
                            MessageBox.Show(string.Format("{0}", process.MainWindowHandle));
                            ShowWindow(process.MainWindowHandle, 5);
                            ShowWindow(process.MainWindowHandle,3);
                            SetForegroundWindow(process.MainWindowHandle);
                            break;
                        }
                    }

Answer 1

隐藏窗口是一个非常重要的细节。

来自MSDN article on the Process.MainWindowHandle Property :

A process has a main window associated with it only if the process has a graphical interface. If the associated process does not have a main window, the MainWindowHandle value is zero. The value is also zero for processes that have been hidden, that is, processes that are not visible in the taskbar.