作法：尋找隔離儲存區中的現有檔案和目錄
若要搜尋隔離儲存區中的目錄，請使用 IsolatedStorageFile.GetDirectoryNames 方法。 此方法會採用表示搜尋模式的字串。 您可以在搜尋模式中使用單一字元 (?) 和多重字元 (*) 萬用字元，但萬用字元必須出現在名稱的最後一個部分。 例如，directory1/*ect* 是有效的搜尋字串，但 *ect*/directory2 不是。
若要搜尋檔案，請使用 IsolatedStorageFile.GetFileNames 方法。 在搜尋字串中，適用於 GetDirectoryNames 的萬用字元限制也適用於 GetFileNames。
這些都不是遞迴方法。IsolatedStorageFile 類別不會提供任何方法來列出存放區中的所有目錄或檔案。 不過，遞迴方法會顯示在下列程式碼範例中。
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，系統會擷取針對使用者、網域和組件所隔離的存放區，並放置在 isoStore 變數中。 CreateDirectory 方法用來設定幾個不同的目錄，而 IsolatedStorageFileStream(String, FileMode, IsolatedStorageFile) 建構函式會在這些目錄中建立一些檔案。 接著，此程式碼會在 GetAllDirectories 方法的結果中執行迴圈。 此方法會使用 GetDirectoryNames 尋找目前目錄中的所有目錄名稱。 這些名稱會儲存在陣列中，然後 GetAllDirectories 會呼叫其本身，進而傳入所找到的每個目錄。 因此，陣列中會傳回所有目錄名稱。 接下來，此程式碼會呼叫 GetAllFiles 方法。 此方法會呼叫 GetAllDirectories 來找出所有目錄的名稱，然後使用 GetFileNames 方法檢查每個目錄中的檔案。 陣列中會傳回結果以供顯示。
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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