Gewusst wie: Auflisten von Speichern für isolierten Speicherung

Sie können alle isolierten Speicher für den aktuellen Benutzer mit der statischen IsolatedStorageFile-Methode GetEnumerator auflisten. GetEnumerator lässt einen IsolatedStorageScope-Wert zu und gibt einen IsolatedStorageFile-Enumerator zurück. User ist der einzige IsolatedStorageScope-Wert, der unterstützt wird. Zum Auflisten von Speichern müssen Sie über IsolatedStorageFilePermission verfügen, die den IsolatedStorageContainment-Wert AdministerIsolatedStorageByUser festlegt. Beim Aufruf durch den IsolatedStorageScope-Wert mit dem Namen User gibt GetEnumerator ein Array von IsolatedStorageFiles zurück, das für den aktuellen Benutzer definiert ist.

Beispiel "EnumeratingStores"

Durch das folgende Codebeispiel wird ein Speicher aufgerufen, der nach Benutzer und Assembly isoliert ist. Die GetEnumerator-Methode wird aufgerufen, und das Ergebnis wird in einen IEnumerator eingefügt. Der Code durchläuft daraufhin IEnumerator, berechnet die Größe der Dateien und gibt das Ergebnis an die Konsole weiter. Die tatsächliche Enumeration erfolgt in der privaten EnumerateTheStore-Methode, die zur besseren Übersicht vom Rest des Codes getrennt ist und im unteren Bereich der Datei angezeigt wird.

Imports System
Imports System.IO
Imports System.IO.IsolatedStorage
Imports System.Collections

Public Class EnumeratingStores
    Public Shared Sub Main()
        ' Get an isolated store for this assembly and put it into an
        ' IsolatedStorageFile object.

        Dim isoStore As IsolatedStorageFile = _
            IsolatedStorageFile.GetStore(IsolatedStorageScope.User Or _
            IsolatedStorageScope.Assembly, Nothing, Nothing)

        ' This code creates a few files so that they can be enumerated.

        Dim streamA As New IsolatedStorageFileStream("TestFileA.Txt", FileMode.Create, isoStore)
        Dim streamB As New IsolatedStorageFileStream("TestFileB.Txt", FileMode.Create, isoStore)
        Dim streamC As New IsolatedStorageFileStream("TestFileC.Txt", FileMode.Create, isoStore)
        Dim streamD As New IsolatedStorageFileStream("TestFileD.Txt", FileMode.Create, isoStore)

        streamA.Close()
        streamB.Close()
        streamC.Close()
        streamD.Close()

        ' There might be a small delay between when the above code
        ' executes and when the files are created in the store.
        ' Closing and opening the store in this example ensures that
        ' the common language runtime has finished creating the files.
        isoStore .Close()
        isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User Or _
            IsolatedStorageScope.Assembly, Nothing, Nothing)

        ' This line of code calls a method at the bottom of the program
        ' that puts all the files in isoStore into an IEnumerator.

        Dim allFiles As IEnumerator = EnumerateTheStore (isoStore)
        Dim totalsize As Long = 0

        ' This code counts up the sizes of all the stores.

        while(allFiles .MoveNext())
            Dim store As IsolatedStorageFile
            store = CType(allFiles.Current, IsolatedStorageFile)
            totalsize += CType(store.UsedSize, Long)
        End While

        Console.WriteLine("The total size = " + totalsize)
    End Sub

    ' This method returns an enumerator of all the files for a user.

    Private Shared Function EnumerateTheStore(isoStore As IsolatedStorageFile) As IEnumerator
        Dim e As IEnumerator = IsolatedStorageFile.GetEnumerator(IsolatedStorageScope.User)

        Return e
    End Function
End Class

using System;
using System.IO;
using System.IO.IsolatedStorage;
using System.Collections;

public class EnumeratingStores
{
    public static int Main()
    {
        // Get an isolated store for this assembly and put it into an
        // IsolatedStorageFile object.

        IsolatedStorageFile isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User |
            IsolatedStorageScope.Assembly, null, null);

        // This code creates a few files so that they can be enumerated.

        IsolatedStorageFileStream streamA = new IsolatedStorageFileStream("TestFileA.Txt", FileMode.Create, isoStore);
        IsolatedStorageFileStream streamB = new IsolatedStorageFileStream("TestFileB.Txt", FileMode.Create, isoStore);
        IsolatedStorageFileStream streamC = new IsolatedStorageFileStream("TestFileC.Txt", FileMode.Create, isoStore);
        IsolatedStorageFileStream streamD = new IsolatedStorageFileStream("TestFileD.Txt", FileMode.Create, isoStore);

        streamA.Close();
        streamB.Close();
        streamC.Close();
        streamD.Close();

        // There might be a small delay between when the above code
        // executes and when the files are created in the store.
        // Closing and opening the store in this example ensures that
        // the common language runtime has finished creating the files.
        isoStore .Close();
        isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User |
            IsolatedStorageScope.Assembly, null, null);

        // This line of code calls a method at the bottom of the program
        // that puts all the files in isoStore into an IEnumerator.

        IEnumerator allFiles = EnumerateTheStore (isoStore);
        long totalsize = 0;

        // This code counts up the sizes of all the stores.

        while(allFiles .MoveNext())
        {
            IsolatedStorageFile store = (IsolatedStorageFile)allFiles.Current;
            totalsize += (long)store.UsedSize;
        }

        Console.WriteLine("The total size = "+totalsize);
        return 0;
    }

    // This method returns an enumerator of all the files for a user.

    private static IEnumerator EnumerateTheStore(IsolatedStorageFile isoStore)
    {
        IEnumerator e = IsolatedStorageFile.GetEnumerator(IsolatedStorageScope.User);

        return e;
    }
}

using namespace System;
using namespace System::IO;
using namespace System::IO::IsolatedStorage;
using namespace System::Collections;

public ref class EnumeratingStores
{
public:
    static int Main()
    {
        // Get an isolated store for this assembly and put it into an
        // IsolatedStorageFile object.

        IsolatedStorageFile^ isoStore = IsolatedStorageFile::GetStore(IsolatedStorageScope::User |
            IsolatedStorageScope::Assembly, (Type ^)nullptr, (Type ^)nullptr);

        // This code creates a few files so that they can be enumerated.

        IsolatedStorageFileStream^ streamA =
            gcnew IsolatedStorageFileStream("TestFileA.Txt", FileMode::Create, isoStore);
        IsolatedStorageFileStream^ streamB =
            gcnew IsolatedStorageFileStream("TestFileB.Txt", FileMode::Create, isoStore);
        IsolatedStorageFileStream^ streamC =
            gcnew IsolatedStorageFileStream("TestFileC.Txt", FileMode::Create, isoStore);
        IsolatedStorageFileStream^ streamD =
            gcnew IsolatedStorageFileStream("TestFileD.Txt", FileMode::Create, isoStore);

        streamA->Close();
        streamB->Close();
        streamC->Close();
        streamD->Close();

        // There might be a small delay between when the above code
        // executes and when the files are created in the store.
        // Closing and opening the store in this example ensures that
        // the common language runtime has finished creating the files.
        isoStore->Close();
        isoStore = IsolatedStorageFile::GetStore(IsolatedStorageScope::User |
            IsolatedStorageScope::Assembly, (Type ^)nullptr, (Type ^)nullptr);

        // This line of code calls a method at the bottom of the program
        // that puts all the files in isoStore into an IEnumerator.

        IEnumerator^ allFiles = EnumerateTheStore(isoStore);
        long totalsize = 0;

        // This code counts up the sizes of all the stores.

        while (allFiles->MoveNext())
        {
            IsolatedStorageFile^ store = (IsolatedStorageFile^)allFiles->Current;
            totalsize += (long)store->UsedSize;
        }

        Console::WriteLine("The total size = " + totalsize);
        return 0;
    }

    // This method returns an enumerator of all the files for a user.

private:
    static IEnumerator^ EnumerateTheStore(IsolatedStorageFile^ isoStore)
    {
        IEnumerator^ e = IsolatedStorageFile::GetEnumerator(IsolatedStorageScope::User);

        return e;
    }
};

int main()
{
    EnumeratingStores::Main();
}

Siehe auch

Referenz

IsolatedStorageFile

Konzepte

Isolierte Speicherung