[英]Visual Basic Performance Counter Doesn't Work
好的,我想在Visual Studio 2010中使用PerformanceCounter
来获取CPU使用率,但是我遇到的问题是,当我添加PerformanceCounter
并尝试添加CategoryName
,列表与CounterName
和InstanceName
一起为空。
我还尝试使用以下代码添加计数器,但仍然无法正常工作:
Imports System.Diagnostics
Dim myCounter As System.Diagnostics.PerformanceCounter = New System.Diagnostics.PerformanceCounter()
myCounter.CategoryName = "Processor"
myCounter.CounterName = "% Processor Time"
myCounter.InstanceName = "_Total"
ProgressBar1.Value = myCounter.NextValue.ToString
cpuTxt.Text = "CPU Usage: " & ProgressBar1.Value.ToString & "%"
知道为什么会这样吗? 我一直在搜索一段时间,但仍然无法正常工作。 任何帮助是极大的赞赏。
我认为您实际上是在轮询计数器? 尝试这样的事情:
Option Strict On
Option Explicit On
Option Infer Off
Imports System.Diagnostics
Public Class Form1
Private myCounter As System.Diagnostics.PerformanceCounter = New System.Diagnostics.PerformanceCounter()
Private WithEvents poll As New Timer
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
myCounter.CategoryName = "Processor"
myCounter.CounterName = "% Processor Time"
myCounter.InstanceName = "_Total"
poll.Interval = 1000
poll.Enabled = True
End Sub
Private Sub poll_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles poll.Tick
Dim val As Single = myCounter.NextValue
ProgressBar1.Value = CInt(val)
cpuTxt.Text = "CPU Usage: " & val.ToString & "%"
End Sub
End Class
正如Hans Passant和Plutonix在评论中都指出的那样,您只应创建一次 counter对象。 每次重新创建计数器只会导致读数为0。
这里可能有两个因素在起作用,PerformanceCounters需要在使用前创建,此操作需要管理员访问计算机或进行足够的升级。
您会注意到,在MSDN提供的示例中,如果计数器当前不存在,则有条件地创建计数器。
https://msdn.microsoft.com/en-us/library/system.diagnostics.performancecounter%28v=vs.110%29.aspx
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