方法 : 分離ストレージでストアを列挙する

更新 : 2007 年 11 月

IsolatedStorageFile の静的メソッドである GetEnumerator を使用して、現在のユーザーに関するすべての分離ストアを列挙できます。GetEnumerator は、IsolatedStorageScope の値を受け取り、IsolatedStorageFile 列挙子を返します。IsolatedStorageScope の値としてサポートされているのは、User だけです。ストアを列挙するには、IsolatedStorageContainment の値 AdministerIsolatedStorageByUser を指定する IsolatedStorageFilePermission が必要です。IsolatedStorageScope の値 User を指定して GetEnumerator を呼び出すと、現在のユーザーに対して定義されている IsolatedStorageFiles の配列が返されます。

EnumeratingStores の例

ユーザーおよびアセンブリ別に分離されたストアを取得し、いくつかのファイルを作成するコード例を次に示します。GetEnumerator メソッドが呼び出され、結果が IEnumerator に置かれます。次に、IEnumerator 内を移動しながらファイルのサイズを集計し、結果をコンソールに報告します。実際の列挙は、わかりやすいように、残りのコードとは別にファイルの末尾に記述されているプライベート EnumerateTheStore メソッドで実行されます。

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

Public Module modmain

    Sub Main()

        ' Get an isolated store for this assembly and put it into an
        ' IsolatedStorageFile object.

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

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

        Dim FileA As IsolatedStorageFileStream
        FileA = New IsolatedStorageFileStream("TestFileA.Txt", FileMode.Create, isoStore)
        Dim FileB As IsolatedStorageFileStream
        FileB = New IsolatedStorageFileStream("TestFileB.Txt", FileMode.Create, isoStore)
        Dim FileC As IsolatedStorageFileStream
        FileC = New IsolatedStorageFileStream("TestFileC.Txt", FileMode.Create, isoStore)
        Dim FileD As IsolatedStorageFileStream
        FileD = New IsolatedStorageFileStream("TestFileD.Txt", FileMode.Create, isoStore)

        FileA.Close()
        FileB.Close()
        FileC.Close()
        FileD.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
        allFiles = EnumerateTheStore(isoStore)

        Dim totalSize As Long

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

        While (allFiles.MoveNext())
            Dim store As IsolatedStorageFile

            ' Explicity convert the current object in allFiles
            ' into an IsolatedStorageFile.

            store = CType(allFiles.Current, IsolatedStorageFile)

            ' Find the current size of the IsolatedStorageFile as
            ' an UInt64, and convert that to a string. Get the value
            ' of the string as a double and convert that to a Long.

            totalSize += CLng(Val(store.CurrentSize.ToString))

        End While

        ' Print out the value.

        System.Console.WriteLine("The size of all the isolated stores in the user scope = " + totalSize.ToString)

    End Sub

    Function EnumerateTheStore(ByVal isoStore As IsolatedStorageFile) As IEnumerator

        Return isoStore.GetEnumerator(IsolatedStorageScope.User)

    End Function
End Module
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.CurrentSize;
        }

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

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

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

参照

参照

IsolatedStorageFile

その他の技術情報

分離ストレージ作業の実行