C#中进程的挂起与恢复

public static class ProcessMgr
 {
  /// <summary>
  /// The process-specific access rights.
  /// </summary>
  [Flags]
  public enum ProcessAccess : uint
  {
   /// <summary>
   /// Required to terminate a process using TerminateProcess.
   /// </summary>
   Terminate = 0x1,/// <summary>
   /// Required to create a thread.
   /// </summary>
   CreateThread = 0x2,/// <summary>
   /// Undocumented.
   /// </summary>
   SetSessionId = 0x4,/// <summary>
   /// Required to perform an operation on the address space of a process (see VirtualProtectEx and WriteProcessMemory).
   /// </summary>
   VmOperation = 0x8,/// <summary>
   /// Required to read memory in a process using ReadProcessMemory.
   /// </summary>
   VmRead = 0x10,/// <summary>
   /// Required to write to memory in a process using WriteProcessMemory.
   /// </summary>
   VmWrite = 0x20,/// <summary>
   /// Required to duplicate a handle using DuplicateHandle.
   /// </summary>
   DupHandle = 0x40,/// <summary>
   /// Required to create a process.
   /// </summary>
   CreateProcess = 0x80,/// <summary>
   /// Required to set memory limits using SetProcessWorkingSetSize.
   /// </summary>
   SetQuota = 0x100,/// <summary>
   /// Required to set certain information about a process,such as its priority class (see SetPriorityClass).
   /// </summary>
   SetInformation = 0x200,/// <summary>
   /// Required to retrieve certain information about a process,such as its token,exit code,and priority class (see OpenProcessToken,GetExitCodeProcess,GetPriorityClass,and IsProcessInJob).
   /// </summary>
   QueryInformation = 0x400,/// <summary>
   /// Undocumented.
   /// </summary>
   SetPort = 0x800,/// <summary>
   /// Required to suspend or resume a process.
   /// </summary>
   SuspendResume = 0x800,/// <summary>
   /// Required to retrieve certain information about a process (see QueryFullProcessImageName). A handle that has the PROCESS_QUERY_INFORMATION access right is automatically granted PROCESS_QUERY_LIMITED_INFORMATION.
   /// </summary>
   QueryLimitedInformation = 0x1000,/// <summary>
   /// Required to wait for the process to terminate using the wait functions.
   /// </summary>
   Synchronize = 0x100000
  }
  [DllImport("ntdll.dll")]
  private static extern uint NtResumeProcess([In] IntPtr processHandle);
  [DllImport("ntdll.dll")]
  private static extern uint NtSuspendProcess([In] IntPtr processHandle);
  [DllImport("kernel32.dll",SetLastError = true)]
  private static extern IntPtr OpenProcess(
   ProcessAccess desiredAccess,bool inheritHandle,int processId);
  [DllImport("kernel32.dll",SetLastError = true)]
  [return: MarshalAs(UnmanagedType.Bool)]
  private static extern bool CloseHandle([In] IntPtr handle);
  public static void SuspendProcess(int processId)
  {
   IntPtr hProc = IntPtr.Zero;
   try
   {
    // Gets the handle to the Process
    hProc = OpenProcess(ProcessAccess.SuspendResume,false,processId);
    if (hProc != IntPtr.Zero)
     NtSuspendProcess(hProc);
   }
   finally
   {
    // Don't forget to close handle you created.
    if (hProc != IntPtr.Zero)
     CloseHandle(hProc);
   }
  }
  public static void ResumeProcess(int processId)
  {
   IntPtr hProc = IntPtr.Zero;
   try
   {
    // Gets the handle to the Process
    hProc = OpenProcess(ProcessAccess.SuspendResume,processId);
    if (hProc != IntPtr.Zero)
     NtResumeProcess(hProc);
   }
   finally
   {
    // Don't forget to close handle you created.
    if (hProc != IntPtr.Zero)
     CloseHandle(hProc);
   }
  }
 }

 private void RunTestProcess(bool hidden = false)
  {
   string appPath = Path.GetDirectoryName(Application.ExecutablePath);
   string testAppPath = Path.Combine(appPath,"TestApp.exe");
   var pi = new ProcessStartInfo();
   pi.FileName = testAppPath;
   pi.Arguments = this.Handle.ToString();
   pi.WindowStyle = hidden ? ProcessWindowStyle.Hidden : ProcessWindowStyle.Normal;
   this.childProcess = Process.Start(pi);
   txtInfo.Text = string.Format("子进程ID：{0}rn子进程名：{1}",childProcess.Id,childProcess.ProcessName);
   ...
  }

private void btnWork_Click(object sender,EventArgs e)
  {
   if (this.childProcess == null || this.childProcess.HasExited)
    return;
   if ((int)btnWork.Tag == 0)
   {
    btnWork.Tag = 1;
    btnWork.Text = "恢复";
    ProcessMgr.SuspendProcess(this.childProcess.Id);
   }
   else
   {
    btnWork.Tag = 0;
    btnWork.Text = "挂起";
    ProcessMgr.ResumeProcess(this.childProcess.Id);
   }
  }

 private void timer_Tick(object sender,EventArgs e)
  {
   if (progressBar.Value < progressBar.Maximum)
    progressBar.Value += 1;
   else
    progressBar.Value = 0;
   if (this.hostHandle != IntPtr.Zero)
    SendMessage(this.hostHandle,WM_PROGRESS,progressBar.Value);
  }