Énumération de magasins
Vous pouvez énumérer tous les magasins isolés pour l'utilisateur actuel à l'aide de la méthode statique GetEnumeratorde IsolatedStorageFile. GetEnumerator accepte une valeur IsolatedStorageScope et retourne un énumérateur IsolatedStorageFile. User est la seule valeur prise en charge pour IsolatedStorageScope. Pour énumérer des magasins, vous devez avoir l'autorisation IsolatedStorageFilePermission dont la valeur IsolatedStorageContainment est AdministerIsolatedStorageByUser. Lorsque la méthode GetEnumerator est appelée alors que la valeur User a été donnée à IsolatedStorageScope, elle retourne un tableau de fichiers IsolatedStorageFiles définis pour l'utilisateur en cours.
EnumeratingStores, exemple
L'exemple de code suivant obtient un magasin isolé par utilisateur et par assembly et crée quelques fichiers. La méthode GetEnumerator est appelée et le résultat est placé dans un IEnumerator. Le code parcourt ensuite IEnumerator en additionnant les tailles de fichiers, et rapporte le résultat à la console. L'énumération réelle se produit dans la méthode EnumerateTheStore privée, séparée du reste du code au bas du fichier pour plus de précision.
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();
}