HOW TO：尋找隔離儲存區中的現有檔案和目錄

您也可以使用隔離儲存區檔案來搜尋現有的目錄和檔案。 請記得，存放區內，檔案和目錄名稱相對於虛擬檔案系統的根來指定。 Windows 檔案系統中的檔案和目錄名稱也會區分大小寫。

如果要搜尋目錄，請使用 IsolatedStorageFile 的 GetDirectoryNames 執行個體方法。 GetDirectoryNames 接受代表搜尋模式的字串。 同時支援單一字元 (?) 和多重字元 (*) 的萬用字元。 這些萬用字元不能出現在名稱的路徑部分；也就是，directory1/*ect* 為有效的搜尋字串，但 *ect*/directory2 則否。

如果要搜尋檔案，請使用 IsolatedStorageFile 的 GetFileNames 執行個體方法。 對套用於 GetDirectoryNames 的搜尋字串內萬用字元的同樣限制也套用於 GetFileNames。

GetDirectoryNames 和 GetFileNames 都不是遞迴的；也就是，IsolatedStorageFile 並不提供列出您存放區中所有目錄或檔案的方法。 然而，以下程式碼有一部分是遞迴方法的範例。 也請注意，GetDirectoryNames 和 GetFileNames 兩者只會傳回找到項目的目錄或檔案名稱。 例如，如果 RootDir/SubDir/SubSubDir 目錄上有符合項目，在結果陣列中將會傳回 SubSubDir。

FindingExistingFilesAndDirectories 範例

下列程式碼範例說明如何在隔離存放區中建立檔案和目錄。 首先，擷取使用者、定義域和組件所隔離的存放區，並置於 isoStore 變數中。 CreateDirectory 方法是用來設定一些不同的目錄，而 IsolatedStorageFileStream 方法則會在這些目錄中建立一些檔案。 程式碼接著對 GetAllDirectories 方法的結果執行迴圈。 這個方法使用 GetDirectoryNames 來尋找目前目錄中的所有目錄名稱。 這些名稱儲存在陣列中，而 GetAllDirectories 接著呼叫它本身，並傳入它所找到的每一個目錄。 結果是陣列中傳回的所有目錄名稱。 接下來，程式碼會呼叫 GetAllFiles 方法。 此方法會呼叫 GetAllDirectories 找出所有目錄的名稱，接著使用 GetFileNames 方法，為檔案檢查每個目錄。 結果在陣列中傳回以供顯示。

Imports System
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")

        Dim aStream As New IsolatedStorageFileStream("InTheRoot.txt", FileMode.Create, isoStore)
        Dim bStream As New IsolatedStorageFileStream("AnotherTopLevelDirectory/InsideDirectory/HereIAm.txt", _
            FileMode.Create, isoStore)
        ' 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

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");
        new IsolatedStorageFileStream("InTheRoot.txt", FileMode.Create, isoStore);
        new 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:");

        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.
}

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();
}

請參閱

參考

IsolatedStorageFile

概念

隔離儲存區