C# 多个线程一直跑着While(true)

在使用多线程的时候，开了多个线程一直在While(true)，会造成CPU占用很高。这时候要在线程内加入一句Thread.Sleep(1)，让他稍微睡一下。就不会消耗那么多CPU了。

代码：

  Thread dataThread = new Thread(delegate()
            {
                while (threadFlag)
                {
                    if (Port != null && Port.IsOpen)
                    {
                        length = Port.BytesToRead;
                        if (length > )
                        {

                            bytes = new byte[length];
                            Port.Read(bytes, , length);

                            tcp.SendData(bytes);

                            if (textBox.InvokeRequired)
                            {

                                textBox.Invoke(new Action<string>(s =>
                                {
                                    textBox.AppendText(s + Environment.NewLine);
                                    textBox.SelectionStart = textBox.TextLength;
                                    textBox.ScrollToCaret();

                                }), System.Text.Encoding.ASCII.GetString(bytes));

                            }
                            else
                            {
                                textBox.AppendText(System.Text.Encoding.ASCII.GetString(bytes) + Environment.NewLine);
                                textBox.SelectionStart = textBox.TextLength;
                                textBox.ScrollToCaret();

                            }
                        }

                    }
                    Thread.Sleep();
                }

            });
            dataThread.IsBackground = true;
            dataThread.Name = PortName;
            dataThread.Start();
        }

    }