界面数据不更新

Question

获取设备的cpu、内存、网络和硬盘使用情况，存放在单独的SystemInfo.cs文件中using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Diagnostics;namespace WindowsFormsApplication1
{
    class SystemInfo
    {
        private PerformanceCounter pCPU;
        private PerformanceCounter pMemory;
        private PerformanceCounter pDisk;
        private PerformanceCounter pNetWorkReceive;
        private PerformanceCounter pNetWorkSend;        private float _cpuUsed;
        private float _memoryUsed;
        private float _diskUsed;
        private float _netReceiveSpeed;
        private float _netSendSpeed;        private SystemInfo()
        {
            
        }        private static SystemInfo singleInstance = new SystemInfo();        public static SystemInfo GetInstance()
        {
            singleInstance.WatchCPU();
            singleInstance.WatchMemory();
            singleInstance.WatchDisk();
            singleInstance.WatchNetWork();            return singleInstance;
        }        public float GetCPU
        {
            get { return _cpuUsed; }
        }        public float GetMem
        {
            get { return _memoryUsed; }
        }        public float GetDisk
        {
            get { return _diskUsed; }
        }        public float GetSendSpeed
        {
            get { return _netSendSpeed; }
        }        public float GetReceiveSpeed
        {
            get { return _netReceiveSpeed; }
        }        private void WatchCPU()
        {
            pCPU = new PerformanceCounter();
            pCPU.CategoryName = "Processor";
            pCPU.CounterName = "% Processor Time";
            pCPU.InstanceName = "_Total";
            _cpuUsed = pCPU.NextValue();
        }        private void WatchMemory()
        {
            pMemory = new PerformanceCounter();
            pMemory.CategoryName = "Memory";
            pMemory.CounterName = "Available MBytes";
            _memoryUsed = pMemory.NextValue();
        }        private void WatchDisk()
        {
            pDisk = new PerformanceCounter();
            pDisk.CategoryName = "LogicalDisk";
            pDisk.CounterName = "% Free Space";
            pDisk.InstanceName = "_Total";
            _diskUsed = pDisk.NextValue();
        }        private void WatchNetWork()
        {
            _netReceiveSpeed = 0;
            _netSendSpeed = 0;            pNetWorkReceive = new PerformanceCounter();
            pNetWorkReceive.CategoryName = "Network Interface";
            pNetWorkReceive.CounterName = "Bytes Received/sec";            PerformanceCounterCategory oneCategory = new PerformanceCounterCategory(pNetWorkReceive.CategoryName);
            string[] allInstances = oneCategory.GetInstanceNames();            pNetWorkSend = new PerformanceCounter();
            pNetWorkSend.CategoryName = "Network Interface";
            pNetWorkSend.CounterName = "Bytes Sent/sec";            for (int i = 0; i < allInstances.Length; i++)
            {
                pNetWorkReceive.InstanceName = allInstances[i];
                _netReceiveSpeed += pNetWorkReceive.NextValue();                pNetWorkSend.InstanceName = allInstances[i];
                _netSendSpeed += pNetWorkSend.NextValue();
            }
        }
现在调用这个类，将数据展示到界面上
界面代码如下：delegate void TransferValue();        private void NewForm_Load(object sender, EventArgs e)
        {
            Thread td = new Thread(new ThreadStart(GetInfo));
            td.Start();            
        }        private void GetInfo()
        {
            while (true)
            {
                cpuInfo = SystemInfo.GetInstance().GetCPU;
                diskInfo = SystemInfo.GetInstance().GetDisk;
                memoryInfo = SystemInfo.GetInstance().GetMem;
                receieInfo = SystemInfo.GetInstance().GetReceiveSpeed;
                sendInfo = SystemInfo.GetInstance().GetSendSpeed;                labelCPU.Invoke(new TransferValue(UpdateUI));
                Thread.Sleep(1000);
                
            }
        }        private void UpdateUI()
        {
            labelCPU.Text = cpuInfo.ToString() + "%";
            labelDisk.Text = diskInfo.ToString();
        }现在的问题是，为什么系统数据不刷新？是不是使用单例模式的时候getinstance方法不会间隔1秒后执行？像这种情况该如何处理？谢谢了。

Answer 1

另外一个文件里面啊，怎么跟啊，form界面的代码里面看到每隔1秒就是去查看那个类返回的值，但是那个值始终不变

Answer 2

 System.Threading.Timer t = new System.Threading.Timer(new TimerCallback(TimerProc));
t.Change(1000, 1000);
 private void TimerProc(object state)
 {}
延迟执行
timer刷新数据

Answer 3

改成timer还是不行，和使用线程一样，只有memory数据可以更新，其它都不可以，不知道为什么，下面是窗体代码，麻烦帮我看看是什么问题，最好能试一下，感激不尽！！public partial class NewForm : Form
    {
        public NewForm()
        {
            InitializeComponent();
        }        private float cpuInfo;
        private float diskInfo;
        private float memoryInfo;
        private float receieInfo;
        private float sendInfo;
        delegate void TransferValue();        private void NewForm_Load(object sender, EventArgs e)
        {
            //Thread td = new Thread(new ThreadStart(GetInfo));
            //td.Start();      
            System.Threading.Timer t = new System.Threading.Timer(new TimerCallback(GetInfo));
            t.Change(1000,1000);
        }        private void GetInfo(object obj)
        {
            //while (true)
            //{
                SystemInfo.GetInstance.DoWork();
                cpuInfo = SystemInfo.GetInstance.GetCPU;
                diskInfo = SystemInfo.GetInstance.GetDisk;
                memoryInfo = SystemInfo.GetInstance.GetMem;
                receieInfo = SystemInfo.GetInstance.GetReceiveSpeed;
                sendInfo = SystemInfo.GetInstance.GetSendSpeed;                labelDisk.Invoke(new TransferValue(UpdateUI));
            //    Thread.Sleep(1000);
                
            //}
        }        private void UpdateUI()
        {
            labelCPU.Text = cpuInfo.ToString() + "%";
            labelMem.Text = memoryInfo.ToString();
            labelNetReceive.Text = receieInfo.ToString();
            labelNetSend.Text = sendInfo.ToString();
            labelDisk.Text = diskInfo.ToString();
        }
    }

Answer 4

        private void WatchCPU()
        {
          
            if (pCPU == null)
            {
            pCPU = new PerformanceCounter();
            pCPU.CategoryName = "Processor";
            pCPU.CounterName = "% Processor Time";
            pCPU.InstanceName = "_Total";
            }            _cpuUsed = pCPU.NextValue();
        }保证所有的PerformanceCounter只被实例化1次就可以了，不要每次调用都重新产生新的实例。
用定时器通过NextValue()来获取更新。