Bagikan melalui

Cara: Menemukan file dan direktori yang ada di penyimpanan terisolasi

Untuk mencari direktori di penyimpanan terisolasi, gunakan metode .IsolatedStorageFile.GetDirectoryNames Metode ini mengambil string yang mewakili pola pencarian. Anda dapat menggunakan karakter wildcard tunggal (?) dan wildcard multi-karakter (*) dalam pola pencarian, tetapi karakter wildcard harus muncul di bagian akhir nama. Misalnya, directory1/*ect* adalah string pencarian yang valid, tetapi *ect*/directory2 tidak.

Untuk mencari file, gunakan metode .IsolatedStorageFile.GetFileNames Pembatasan untuk karakter kartu bebas dalam string pencarian yang berlaku untuk GetDirectoryNames juga berlaku untuk GetFileNames.

Tidak satu pun dari metode ini rekursif; IsolatedStorageFile kelas tidak menyediakan metode apa pun untuk mencantumkan semua direktori atau file di penyimpanan Anda. Namun, metode rekursif ditampilkan dalam contoh kode berikut.

Contoh

Contoh kode berikut mengilustrasikan cara membuat file dan direktori di penyimpanan terisolasi. Pertama, penyimpanan yang diisolasi untuk pengguna, domain, dan rakitan diambil dan ditempatkan dalam variabel isoStore. Metode CreateDirectory ini digunakan untuk menyiapkan beberapa direktori yang berbeda, dan IsolatedStorageFileStream(String, FileMode, IsolatedStorageFile) konstruktor membuat beberapa file di direktori ini. Kode kemudian mengulang hasil dari metode GetAllDirectories. Metode ini menggunakan GetDirectoryNames untuk menemukan semua nama direktori di direktori saat ini. Nama-nama ini disimpan dalam array, dan kemudian GetAllDirectories memanggil dirinya sendiri, melewati setiap direktori yang telah ditemukannya. Akibatnya, semua nama direktori dikembalikan dalam array. Selanjutnya, kode memanggil GetAllFiles metode . Metode ini memanggil GetAllDirectories untuk mengetahui nama semua direktori, dan kemudian memeriksa setiap direktori untuk file dengan menggunakan GetFileNames metode . Hasilnya dikembalikan dalam array untuk ditampilkan.

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

Lihat juga