PerformanceCounterCategory.GetInstanceNames Metode

Definisi

Ruang nama:

System.Diagnostics

Rakitan:

System.Diagnostics.PerformanceCounter.dll

Paket:

System.Diagnostics.PerformanceCounter v8.0.0

Sumber:

PerformanceCounterCategory.cs

Mengambil daftar instans objek performa yang terkait dengan kategori ini.

public:
 cli::array <System::String ^> ^ GetInstanceNames();

public string[] GetInstanceNames ();

member this.GetInstanceNames : unit -> string[]

Public Function GetInstanceNames () As String()

Mengembalikan

String[]

Array string yang mewakili nama instans objek performa yang terkait dengan kategori ini atau, jika kategori hanya berisi satu instans objek performa, array entri tunggal yang berisi string kosong ("").

Pengecualian

InvalidOperationException

Properti CategoryName adalah null. Properti mungkin belum disetel.

-atau-

Kategori tidak memiliki instans terkait.

Win32Exception

Panggilan ke API sistem yang mendasar gagal.

UnauthorizedAccessException

Kode yang dijalankan tanpa hak administratif mencoba membaca penghitung kinerja.

Contoh

Contoh kode berikut mendapatkan daftar PerformanceCounter objek dalam PerformanceCounterCategory. Ini pertama-tama PerformanceCounterCategory membuat objek, menggunakan konstruktor yang sesuai berdasarkan apakah nama komputer ditentukan. Kemudian menggunakan GetInstanceNames untuk mengembalikan nama instans sebagai array , Stringyang diurutkan dan ditampilkan.

public:
    static void Main(array<String^>^ args)
    {
        String^ categoryName = "";
        String^ machineName = "";
        PerformanceCounterCategory^ pcc;
        array<String^>^ instances;

        // Copy the supplied arguments into the local variables.
        try
        {
            categoryName = args[1];
            machineName = args[2]=="."? "": args[2];
        }
        catch (...)
        {
            // Ignore the exception from non-supplied arguments.
        }

        try
        {
            // Create the appropriate PerformanceCounterCategory object.
            if (machineName->Length > 0)
            {
                pcc = gcnew PerformanceCounterCategory(categoryName, machineName);
            }
            else
            {
                pcc = gcnew PerformanceCounterCategory(categoryName);
            }

            // Get the instances associated with this category.
            instances = pcc->GetInstanceNames();

        }
        catch (Exception^ ex)
        {
            Console::WriteLine("Unable to get instance information for " +
                "category \"{0}\" on " + 
                (machineName->Length>0? "computer \"{1}\":": "this computer:"),
                categoryName, machineName);
            Console::WriteLine(ex->Message);
            return;
        }

        //If an empty array is returned, the category has a single instance.
        if (instances->Length==0)
        {
            Console::WriteLine("Category \"{0}\" on " +
                (machineName->Length>0? "computer \"{1}\"": "this computer") +
                " is single-instance.", pcc->CategoryName, pcc->MachineName);
        }
        else
        {
            // Otherwise, display the instances.
            Console::WriteLine("These instances exist in category \"{0}\" on " +
                (machineName->Length>0? "computer \"{1}\".": "this computer:"),
                pcc->CategoryName, pcc->MachineName);

            Array::Sort(instances);
            int objX;
            for (objX = 0; objX < instances->Length; objX++)
            {
                Console::WriteLine("{0,4} - {1}", objX+1, instances[objX]);
            }
        }
    }

public static void Main(string[] args)
{
    string categoryName = "";
    string machineName = "";
    PerformanceCounterCategory pcc;
    string[] instances;

    // Copy the supplied arguments into the local variables.
    try
    {
        categoryName = args[0];
        machineName = args[1]=="."? "": args[1];
    }
    catch
    {
        // Ignore the exception from non-supplied arguments.
    }

    try
    {
        // Create the appropriate PerformanceCounterCategory object.
        if (machineName.Length>0)
        {
            pcc = new PerformanceCounterCategory(categoryName, machineName);
        }
        else
        {
            pcc = new PerformanceCounterCategory(categoryName);
        }

        // Get the instances associated with this category.
        instances = pcc.GetInstanceNames();
    }
    catch(Exception ex)
    {
        Console.WriteLine("Unable to get instance information for " +
            "category \"{0}\" on " +
            (machineName.Length>0? "computer \"{1}\":": "this computer:"),
            categoryName, machineName);
        Console.WriteLine(ex.Message);
        return;
    }

    //If an empty array is returned, the category has a single instance.
    if (instances.Length==0)
    {
        Console.WriteLine("Category \"{0}\" on " +
            (machineName.Length>0? "computer \"{1}\"": "this computer") +
            " is single-instance.", pcc.CategoryName, pcc.MachineName);
    }
    else
    {
        // Otherwise, display the instances.
        Console.WriteLine("These instances exist in category \"{0}\" on " +
            (machineName.Length>0? "computer \"{1}\".": "this computer:"),
            pcc.CategoryName, pcc.MachineName);

        Array.Sort(instances);
        int objX;
        for(objX=0; objX<instances.Length; objX++)
        {
            Console.WriteLine("{0,4} - {1}", objX+1, instances[objX]);
        }
    }
}

Sub Main(ByVal args() As String)
    Dim categoryName As String = ""
    Dim machineName As String = ""
    Dim pcc As PerformanceCounterCategory
    Dim instances() As String

    ' Copy the supplied arguments into the local variables.
    Try
        categoryName = args(0)
        machineName = IIf(args(1) = ".", "", args(1))
    Catch ex As Exception
        ' Ignore the exception from non-supplied arguments.
    End Try

    Try
        ' Create the appropriate PerformanceCounterCategory object.
        If machineName.Length > 0 Then
            pcc = New PerformanceCounterCategory(categoryName, machineName)
        Else
            pcc = New PerformanceCounterCategory(categoryName)
        End If

        ' Get the instances associated with this category.
        instances = pcc.GetInstanceNames()

    Catch ex As Exception
        Console.WriteLine("Unable to get instance information for " & _
             "category ""{0}"" on " & IIf(machineName.Length > 0, _
             "computer ""{1}"":", "this computer:"), _
             categoryName, machineName)
        Console.WriteLine(ex.Message)
        Return
    End Try

    'If an empty array is returned, the category has a single instance.
    If instances.Length = 0 Then
        Console.WriteLine( _
            "Category ""{0}"" on " & IIf(machineName.Length > 0, _
            "computer ""{1}""", "this computer") & _
            " is single-instance.", pcc.CategoryName, pcc.MachineName)
    Else
        ' Otherwise, display the instances.
        Console.WriteLine( _
            "These instances exist in category ""{0}"" on " & _
            IIf(machineName.Length > 0, _
                "computer ""{1}"".", "this computer:"), _
            pcc.CategoryName, pcc.MachineName)

        Array.Sort(instances)
        Dim objX As Integer
        For objX = 0 To instances.Length - 1
            Console.WriteLine("{0,4} - {1}", objX + 1, instances(objX))
        Next objX
    End If
End Sub

Keterangan

Catatan

Untuk membaca penghitung kinerja dari sesi masuk non-interaktif di Windows Vista dan yang lebih baru, Windows XP Professional x64 Edition, atau Windows Server 2003, Anda harus menjadi anggota grup Pengguna Monitor Performa atau memiliki hak administratif.

Untuk menghindari harus meningkatkan hak istimewa Anda untuk mengakses penghitung kinerja di Windows Vista dan yang lebih baru, tambahkan diri Anda ke grup Pengguna Monitor Performa.

Di Windows Vista dan yang lebih baru, Kontrol Akun Pengguna (User Account Control atau UAC) menentukan hak istimewa pengguna. Jika Anda adalah anggota grup Administrator Bawaan, Anda diberi dua token akses run-time: token akses pengguna standar dan token akses administrator. Secara default, Anda berada dalam peran pengguna standar. Untuk menjalankan kode yang mengakses penghitung kinerja, Anda harus terlebih dahulu meningkatkan hak istimewa Anda dari pengguna standar ke administrator. Anda dapat melakukan ini saat memulai aplikasi dengan mengeklik kanan ikon aplikasi dan menunjukkan bahwa Anda ingin menjalankan sebagai administrator.

Lihat juga

• CategoryName
• InstanceName
• PerformanceCounter