Cómo: Enumerar los almacenes de almacenamiento aislado

Se pueden enumerar todos los almacenes aislados del usuario actual utilizando el método estático GetEnumerator de IsolatedStorageFile. GetEnumerator toma un valor de IsolatedStorageScope y devuelve un enumerador IsolatedStorageFile. User es el único valor de IsolatedStorageScope admitido. Para enumerar almacenes, debe tener el IsolatedStorageFilePermission que especifica el valor AdministerIsolatedStorageByUser de IsolatedStorageContainment. Cuando se le llama con el valor User de IsolatedStorageScope, GetEnumerator devuelve una matriz de IsolatedStorageFiles definidos para el usuario actual.

Ejemplo de EnumeratingStores

El siguiente código de ejemplo obtiene un almacén aislado por usuario y ensamblado y crea unos cuantos archivos. Se llama al método GetEnumerator y el resultado se coloca en una interfaz IEnumerator. A continuación, el código recorre el IEnumerator, suma los tamaños de los archivos e informa del resultado en la consola. La enumeración tiene lugar en el método privado EnumerateTheStore que se separa del resto del código al final del archivo para una mayor claridad.

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();
}

Vea también

Referencia

IsolatedStorageFile

Conceptos

Almacenamiento aislado