使用時PerformanceCounters

Question

獲得獲得InvalidOperationException異常：在System.dll中

'System.InvalidOperationException' 的附加信息：

拋出異常

類別不存在。

代碼：每.nextValue();

我曾嘗試在CategoryName加入Processor Information，但也沒有幫助

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(); 
    } 
} 
} 

得到錯誤。

編輯： @Jim這是進行更改後我的代碼：

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(); 
    } 
} 

}

Answer 1

您正在創建新的性能計數器每次計時器滴答的時間，你只需要初始化計數器一次。

Form1的代碼隱藏

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(); 
} 

旁註：

而且Dispose計數器時不使用它們了。也許在Form Closing事件上。

cpuCounter.Dispose(); 
ramCounter.Dispose(); 

---

結果

---

出錯的情況下

如果我的例子仍然拋出一個錯誤，這是最有可能是因爲一個或多個性能計數器上您的系統已損壞。

重建所有性能計數器：

• 打開命令提示（具有管理員權限）
• 運行命令：lodctr /R

消息：

信息：成功地重建性能計數器設置...

將出現成功。

如果您收到消息：

無法重建從系統備份存儲性能計數器設置，錯誤代碼是2級

可能的解決方案：

• 關閉所有正在運行程序
• 請確保您使用lodctr /R且大寫R
• 如果在SYSTEM32目錄移動到目錄SysWOW64中（與CD ..> CD SysWow64資料），並在該目錄中重試lodctr /R命令

Answer 2

使用的PerformanceCounter之前創建一個類別。更多細節和例子msdn

const String categoryName = "Processor"; 
    const String counterName = "% Processor Time"; 

    if (!PerformanceCounterCategory.Exists(categoryName)) 
    { 

     CounterCreationDataCollection CCDC = new CounterCreationDataCollection(); 

     // Add the counter. 
     CounterCreationData ETimeData = new CounterCreationData(); 
     ETimeData.CounterType = PerformanceCounterType.ElapsedTime; 
     ETimeData.CounterName = counterName; 
     CCDC.Add(ETimeData);  

     // Create the category. 
     PerformanceCounterCategory.Create(categoryName, 
       "Demonstrates ElapsedTime performance counter usage.", 
      PerformanceCounterCategoryType.SingleInstance, CCDC); 
    }