获得:
Exception thrown: ‘System.InvalidOperationException’ in System.dll
附加信息:
Category does not exist.
代码 :
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication8
{
public partial class Form1 : Form
{
PerformanceCounter cpuCounter;
PerformanceCounter ramCounter;
public Form1()
{
InitializeComponent();
}
int timeX = 0;
private void timer1_Tick(object sender, EventArgs e)
{
cpuCounter = new PerformanceCounter();
cpuCounter.CategoryName = "Processor";
cpuCounter.CounterName = "% Processor Time";
cpuCounter.InstanceName = "_Total";
float cpuUsage = 0.00F;
cpuCounter.NextValue();
cpuUsage = cpuCounter.NextValue();
textBox1.Text = cpuUsage.ToString();
ramCounter = new PerformanceCounter("Memory", "Available MBytes");
float ram = ramCounter.NextValue();
textBox2.Text = ram.ToString();
chart1.Series["CPU Usage"].Points.AddXY(timeX, (int)cpuUsage);
chart2.Series["Memory Use"].Points.AddXY(timeX, (int)ram);
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Stop();
}
}
}
在每个.nextValue()上获取错误;
我尝试在CategoryName中添加处理器信息,但也没有帮助.
编辑:
@Jim这是我做出更改后的代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;
namespace WindowsFormsApplication12
{
public partial class Form1 : Form
{
PerformanceCounter cpuCounter;
PerformanceCounter ramCounter;
public Form1()
{
InitializeComponent();
InitializeCounters();
}
private void InitializeCounters()
{
cpuCounter = new PerformanceCounter();
cpuCounter.CategoryName = "Processor";
cpuCounter.CounterName = "% Processor Time";
cpuCounter.InstanceName = "_Total";
// ramCounter = new PerformanceCounter("Memory", "Available MBytes");
}
int timeX = 0;
private void timer1_Tick(object sender, EventArgs e)
{
float cpuUsage = 0.00F;
cpuUsage = cpuCounter.NextValue();
textBox1.Text = cpuUsage.ToString();
float ram = ramCounter.NextValue();
textBox2.Text = ram.ToString();
// Your chart stuff
//chart1.Series["CPU Usage"].Points.AddXY(timeX, (int)cpuUsage);
//chart2.Series["Memory Use"].Points.AddXY(timeX, (int)ram);
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Stop();
}
}
}
最佳答案 每次计时器滴答时,您都在创建新的性能计数器,您只需要初始化计数器一次.
Form1代码背后
PerformanceCounter cpuCounter;
PerformanceCounter ramCounter;
public Form1()
{
InitializeComponent();
InitializeCounters();
}
private void InitializeCounters()
{
cpuCounter = new PerformanceCounter();
cpuCounter.CategoryName = "Processor";
cpuCounter.CounterName = "% Processor Time";
cpuCounter.InstanceName = "_Total";
ramCounter = new PerformanceCounter("Memory", "Available MBytes");
}
int timeX = 0;
private void timer1_Tick(object sender, EventArgs e)
{
float cpuUsage = 0.00F;
cpuUsage = cpuCounter.NextValue();
textBox1.Text = cpuUsage.ToString();
float ram = ramCounter.NextValue();
textBox2.Text = ram.ToString();
// Your chart stuff
//chart1.Series["CPU Usage"].Points.AddXY(timeX, (int)cpuUsage);
//chart2.Series["Memory Use"].Points.AddXY(timeX, (int)ram);
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Stop();
}
边注:
不再使用时也要处理计数器.也许在Form Closing事件上.
cpuCounter.Dispose();
ramCounter.Dispose();
结果
出错的情况
如果我的示例仍然抛出错误,这很可能是因为系统上的一个或多个性能计数器已损坏.
重建所有性能计数器:
>打开命令提示符(具有Admin权限)
>运行命令:lodctr / R.
消息:
Info: Successfully rebuilt performance counter setting …
将在成功时出现.
如果您收到消息:
Unable to rebuild performance counter setting from system backup store, error code is 2
可能的解决方案:
>关闭所有正在运行的程序
>确保使用大写R的lodctr / R.
>如果在目录system32中移动到目录SysWOW64(使用cd ..> cd syswow64)并在此目录中重试lodctr / R命令