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Anvisningar: Hitta befintliga filer och kataloger i isolerad lagring

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Om du vill söka efter en katalog i isolerad lagring använder du IsolatedStorageFile.GetDirectoryNames metoden . Den här metoden tar en sträng som representerar ett sökmönster. Du kan använda jokertecken med både ett tecken (?) och flera tecken (*) i sökmönstret, men jokertecken måste visas i den sista delen av namnet. Till exempel directory1/*ect* är en giltig söksträng, men *ect*/directory2 det är den inte.

Om du vill söka efter en fil använder du IsolatedStorageFile.GetFileNames metoden . Begränsningen för jokertecken i söksträngar som gäller för GetDirectoryNames gäller även för GetFileNames.

Ingen av dessa metoder är rekursiv; klassen IsolatedStorageFile tillhandahåller inga metoder för att lista alla kataloger eller filer i ditt arkiv. Rekursiva metoder visas dock i följande kodexempel.

Exempel

I följande kodexempel visas hur du skapar filer och kataloger i ett isolerat arkiv. Först hämtas ett arkiv som är isolerat för användare, domän och sammansättning och placeras i variabeln isoStore . Metoden CreateDirectory används för att konfigurera några olika kataloger och IsolatedStorageFileStream(String, FileMode, IsolatedStorageFile) konstruktorn skapar några filer i dessa kataloger. Koden loopar sedan igenom resultatet av GetAllDirectories metoden. Den här metoden använder GetDirectoryNames för att hitta alla katalognamn i den aktuella katalogen. Dessa namn lagras i en matris och anropar sedan GetAllDirectories sig själv och skickar in varje katalog som den har hittat. Därför returneras alla katalognamn i en matris. Därefter anropar GetAllFiles koden metoden. Den här metoden anropar GetAllDirectories för att ta reda på namnen på alla kataloger och kontrollerar sedan varje katalog efter filer med hjälp GetFileNames av metoden . Resultatet returneras i en matris för visning.

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

public class FindingExistingFilesAndDirectories
{
public:
    // Retrieves an array of all directories in the store, and
    // displays the results.
    static void Main()
    {
        // This part of the code sets up a few directories and files in the
        // store.
        IsolatedStorageFile^ isoStore = IsolatedStorageFile::GetStore(IsolatedStorageScope::User |
            IsolatedStorageScope::Assembly, (Type ^)nullptr, (Type ^)nullptr);
        isoStore->CreateDirectory("TopLevelDirectory");
        isoStore->CreateDirectory("TopLevelDirectory/SecondLevel");
        isoStore->CreateDirectory("AnotherTopLevelDirectory/InsideDirectory");
        gcnew IsolatedStorageFileStream("InTheRoot.txt", FileMode::Create, isoStore);
        gcnew IsolatedStorageFileStream("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt",
            FileMode::Create, isoStore);
        // End of setup.

        Console::WriteLine('\r');
        Console::WriteLine("Here is a list of all directories in this isolated store:");

        for each (String^ directory in GetAllDirectories("*", isoStore))
        {
            Console::WriteLine(directory);
        }
        Console::WriteLine('\r');

        // Retrieve all the files in the directory by calling the GetFiles
        // method.

        Console::WriteLine("Here is a list of all the files in this isolated store:");
        for each (String^ file in GetAllFiles("*", isoStore))
        {
            Console::WriteLine(file);
        }

    } // End of Main.

    // Method to retrieve all directories, recursively, within a store.
    static List<String^>^ GetAllDirectories(String^ pattern, IsolatedStorageFile^ storeFile)
    {
        // Get the root of the search string.
        String^ root = Path::GetDirectoryName(pattern);

        if (root != "")
        {
            root += "/";
        }

        // Retrieve directories.
        array<String^>^ directories = storeFile->GetDirectoryNames(pattern);

        List<String^>^ directoryList = gcnew List<String^>(directories);

        // Retrieve subdirectories of matches.
        for (int i = 0, max = directories->Length; i < max; i++)
        {
             String^ directory = directoryList[i] + "/";
             List<String^>^ more = GetAllDirectories (root + directory + "*", storeFile);

             // For each subdirectory found, add in the base path.
             for (int j = 0; j < more->Count; j++)
             {
                 more[j] = directory + more[j];
             }

            // Insert the subdirectories into the list and
            // update the counter and upper bound.
            directoryList->InsertRange(i + 1, more);
            i += more->Count;
            max += more->Count;
        }

        return directoryList;
    }

    static List<String^>^ GetAllFiles(String^ pattern, IsolatedStorageFile^ storeFile)
    {
        // Get the root and file portions of the search string.
        String^ fileString = Path::GetFileName(pattern);
        array<String^>^ files = storeFile->GetFileNames(pattern);

        List<String^>^ fileList = gcnew List<String^>(files);

        // Loop through the subdirectories, collect matches,
        // and make separators consistent.
        for each (String^ directory in GetAllDirectories( "*", storeFile))
        {
            for each (String^ file in storeFile->GetFileNames(directory + "/" + fileString))
            {
                fileList->Add((directory + "/" + file));
            }
        }

        return fileList;
    } // End of GetFiles.
};

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

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

public class FindingExistingFilesAndDirectories
{
    // Retrieves an array of all directories in the store, and
    // displays the results.
    public static void Main()
    {
        // This part of the code sets up a few directories and files in the
        // store.
        IsolatedStorageFile isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User |
            IsolatedStorageScope.Assembly, null, null);
        isoStore.CreateDirectory("TopLevelDirectory");
        isoStore.CreateDirectory("TopLevelDirectory/SecondLevel");
        isoStore.CreateDirectory("AnotherTopLevelDirectory/InsideDirectory");
        isoStore.CreateFile("InTheRoot.txt");
        isoStore.CreateFile("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt");
        // End of setup.

        Console.WriteLine('\r');
        Console.WriteLine("Here is a list of all directories in this isolated store:");

        foreach (string directory in GetAllDirectories("*", isoStore))
        {
            Console.WriteLine(directory);
        }
        Console.WriteLine('\r');

        // Retrieve all the files in the directory by calling the GetFiles
        // method.

        Console.WriteLine("Here is a list of all the files in this isolated store:");
        foreach (string file in GetAllFiles("*", isoStore)){
            Console.WriteLine(file);
        }
    } // End of Main.

    // Method to retrieve all directories, recursively, within a store.
    public static List<String> GetAllDirectories(string pattern, IsolatedStorageFile storeFile)
    {
        // Get the root of the search string.
        string root = Path.GetDirectoryName(pattern);

        if (root != "")
        {
            root += "/";
        }

        // Retrieve directories.
        List<String> directoryList = new List<String>(storeFile.GetDirectoryNames(pattern));

        // Retrieve subdirectories of matches.
        for (int i = 0, max = directoryList.Count; i < max; i++)
        {
            string directory = directoryList[i] + "/";
            List<String> more = GetAllDirectories(root + directory + "*", storeFile);

            // For each subdirectory found, add in the base path.
            for (int j = 0; j < more.Count; j++)
            {
                more[j] = directory + more[j];
            }

            // Insert the subdirectories into the list and
            // update the counter and upper bound.
            directoryList.InsertRange(i + 1, more);
            i += more.Count;
            max += more.Count;
        }

        return directoryList;
    }

    public static List<String> GetAllFiles(string pattern, IsolatedStorageFile storeFile)
    {
        // Get the root and file portions of the search string.
        string fileString = Path.GetFileName(pattern);

        List<String> fileList = new List<String>(storeFile.GetFileNames(pattern));

        // Loop through the subdirectories, collect matches,
        // and make separators consistent.
        foreach (string directory in GetAllDirectories("*", storeFile))
        {
            foreach (string file in storeFile.GetFileNames(directory + "/" + fileString))
            {
                fileList.Add((directory + "/" + file));
            }
        }

        return fileList;
    } // End of GetFiles.
}

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

Public class FindingExistingFilesAndDirectories
    ' These arrayLists hold the directory and file names as they are found.

    Private Shared directoryList As New List(Of String)
    Private Shared fileList As New List(Of String)

    ' Retrieves an array of all directories in the store, and
    ' displays the results.

    Public Shared Sub Main()
        ' This part of the code sets up a few directories and files in the store.
        Dim isoStore As IsolatedStorageFile = IsolatedStorageFile.GetStore(IsolatedStorageScope.User Or _
            IsolatedStorageScope.Assembly Or IsolatedStorageScope.Domain, Nothing, Nothing)
        isoStore.CreateDirectory("TopLevelDirectory")
        isoStore.CreateDirectory("TopLevelDirectory/SecondLevel")
        isoStore.CreateDirectory("AnotherTopLevelDirectory/InsideDirectory")
        isoStore.CreateFile("InTheRoot.txt")
        isoStore.CreateFile("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt")
        ' End of setup.

        Console.WriteLine()
        Console.WriteLine("Here is a list of all directories in this isolated store:")

        GetAllDirectories("*", isoStore)
        For Each directory As String In directoryList
            Console.WriteLine(directory)
        Next

        Console.WriteLine()
        Console.WriteLine("Retrieve all the files in the directory by calling the GetFiles method.")

        GetAllFiles(isoStore)
        For Each file As String In fileList
            Console.WriteLine(file)
        Next
    End Sub

    Public Shared Sub GetAllDirectories(ByVal pattern As String, ByVal storeFile As IsolatedStorageFile)
        ' Retrieve directories.
        Dim directories As String() = storeFile.GetDirectoryNames(pattern)

        For Each directory As String In directories
            ' Add the directory to the final list.
            directoryList.Add((pattern.TrimEnd(CChar("*"))) + directory + "/")
            ' Call the method again using directory.
            GetAllDirectories((pattern.TrimEnd(CChar("*")) + directory + "/*"), storeFile)
        Next
    End Sub

    Public Shared Sub GetAllFiles(ByVal storefile As IsolatedStorageFile)
        ' This adds the root to the directory list.
        directoryList.Add("*")
        For Each directory As String In directoryList
            Dim files As String() = storefile.GetFileNames(directory + "*")
            For Each dirfile As String In files
                fileList.Add(dirfile)
            Next
        Next
    End Sub
End Class

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