private void txtCmdInput_KeyUp(object sender, KeyEventArgs e)       {           if (e.KeyCode == Keys.Enter)           {               int count = txtCmdInput.Lines.Length;               if (count == 0) return;               while (count > 0 && (string.IsNullOrEmpty(txtCmdInput.Lines[count - 1])))               {                   count--;               }               if (count > 0)// && !string.IsNullOrEmpty(txtCmdInput.Lines[count - 1]))                   ExecuteCmd(txtCmdInput.Lines[count - 1]);           }       }       public void ExecuteCmd(string cmd)       {           System.Diagnostics.Process p = new System.Diagnostics.Process();           p.StartInfo.FileName = "cmd.exe";           p.StartInfo.UseShellExecute = false;           p.StartInfo.RedirectStandardInput = true;           p.StartInfo.RedirectStandardOutput = true;           p.StartInfo.RedirectStandardError = true;           p.StartInfo.CreateNoWindow = true;           p.Start();                                  //设置自动刷新缓冲并更新              p.StandardInput.AutoFlush = true;           //写入命令                p.StandardInput.WriteLine(cmd);           p.StandardInput.WriteLine("exit");          //等待结束             txtCmdInput.AppendText(p.StandardOutput.ReadToEnd());           p.WaitForExit();           p.Close();       }