Question

此代码曾经工作，现在它抛出异常并拒绝工作。代码没有改变。我怀疑原因是我将磁盘分区以添加第二个分区。预期目的是监视物理驱动器自身路径所在的％空闲时间。

    Try
        Dim drive As String = BunzipInputStream.BinDirectory.Substring(0, 2)
        Dim instname As String = Nothing
        If drive.EndsWith(":"c, StringComparison.Ordinal) Then
            Dim dix = New System.Diagnostics.PerformanceCounterCategory
            dix.CategoryName = "PhysicalDisk"
            For Each px In dix.GetInstanceNames()
                If px.EndsWith(drive, StringComparison.OrdinalIgnoreCase) Then
                    instname = px
                End If
            Next
            diskcounter = New System.Diagnostics.PerformanceCounter()
            diskcounter.CategoryName = "PhysicalDisk"
            diskcounter.CounterName = "% Idle Time"
            diskcounter.InstanceName = instname
            diskcounter.NextValue()
        End If
    Catch ex As Exception
        'ENDS UP HERE AND ABORTS THE MONITOR
        If Not diskcounter Is Nothing Then
            diskcounter.Dispose()
            diskcounter = Nothing
        End If
    End Try

（这是设置代码。有一个定时器调用diskcounter.NextValue（），如果它不显示）。

System.InvalidOperationException occurred
  Message=Counter is not single instance, an instance name needs to be specified.
  Source=System
  StackTrace:
       at System.Diagnostics.PerformanceCounter.NextSample()
       at System.Diagnostics.PerformanceCounter.NextValue()
       at Redacted.PerformanceMon.OnHandleCreated(EventArgs e) in C:\development\redacted\redacted\Forms\PerformanceMon.vb:line XX
  InnerException:

Answer 1

正如Hans Passant在评论中所说，你的变量 instname 可能没有像你想要的那样设置。

为什么此性能监视器代码失败

1 个答案: