Procedure: Bestaande bestanden en mappen zoeken in geïsoleerde opslag
Gebruik de IsolatedStorageFile.GetDirectoryNames methode om te zoeken naar een map in geïsoleerde opslag. Deze methode gebruikt een tekenreeks die een zoekpatroon vertegenwoordigt. U kunt zowel jokertekens met één teken (?) als met meerdere tekens (*) gebruiken in het zoekpatroon, maar de jokertekens moeten worden weergegeven in het laatste gedeelte van de naam. Is bijvoorbeeld directory1/*ect* een geldige zoekreeks, maar *ect*/directory2 niet.
Als u een bestand wilt zoeken, gebruikt u de IsolatedStorageFile.GetFileNames methode. De beperking voor jokertekens in zoekreeksen waarop ook van toepassing is GetDirectoryNamesGetFileNames.
Geen van deze methoden is recursief; de klasse biedt geen methoden voor het IsolatedStorageFile weergeven van alle mappen of bestanden in uw winkel. Recursieve methoden worden echter weergegeven in het volgende codevoorbeeld.
Opmerking
In het volgende codevoorbeeld ziet u hoe u bestanden en mappen maakt in een geïsoleerd archief. Eerst wordt een archief dat is geïsoleerd voor gebruiker, domein en assembly opgehaald en in de isoStore variabele geplaatst. De CreateDirectory methode wordt gebruikt om een aantal verschillende mappen in te stellen en de IsolatedStorageFileStream(String, FileMode, IsolatedStorageFile) constructor maakt enkele bestanden in deze mappen. De code doorloopt vervolgens de resultaten van de GetAllDirectories methode. Deze methode gebruikt GetDirectoryNames om alle mapnamen in de huidige map te zoeken. Deze namen worden opgeslagen in een matrix en roept zichzelf vervolgens GetAllDirectories aan, waarbij elke map wordt doorgegeven die deze heeft gevonden. Als gevolg hiervan worden alle mapnamen geretourneerd in een matrix. Vervolgens roept de code de GetAllFiles methode aan. Met deze methode wordt aangeroepen GetAllDirectories om de namen van alle mappen te achterhalen en vervolgens wordt elke map gecontroleerd op bestanden met behulp van de GetFileNames methode. Het resultaat wordt geretourneerd in een matrix voor weergave.
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
Zie ook
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