HOW TO：列舉隔離儲存區的存放區
您可以使用 IsolatedStorageFile 靜態方法 GetEnumerator，列舉目前使用者所有的隔離存放區。 GetEnumerator 會取得 IsolatedStorageScope 值並傳回 IsolatedStorageFile 列舉值。 User 是唯一支援的 IsolatedStorageScope 值。 如果要列舉存放區，您必須具有將 IsolatedStorageContainment 值指定為 AdministerIsolatedStorageByUser 的 IsolatedStorageFilePermission。 當以 IsolatedStorageScope 值 User 呼叫時，GetEnumerator 會傳回為目前使用者定義的 IsolatedStorageFiles 陣列。
EnumeratingStores 範例
下列程式碼範例取得使用者和組件所隔離的存放區，並建立一些檔案。 會呼叫 GetEnumerator 方法，並將結果置於 IEnumerator 中。 程式碼接著對 IEnumerator 進行迴圈，加總檔案的大小，並報告結果至主控台 (Console)。 實際的列舉發生於私用的 EnumerateTheStore 方法 (從檔案底部的其餘程式碼中區分出來以作分別)。
Imports System
Imports System.IO
Imports System.IO.IsolatedStorage
Imports System.Collections
Public Class EnumeratingStores
Public Shared Sub Main()
' Get an isolated store for this assembly and put it into an
' IsolatedStorageFile object.
Dim isoStore As IsolatedStorageFile = _
IsolatedStorageFile.GetStore(IsolatedStorageScope.User Or _
IsolatedStorageScope.Assembly, Nothing, Nothing)
' This code creates a few files so that they can be enumerated.
Dim streamA As New IsolatedStorageFileStream("TestFileA.Txt", FileMode.Create, isoStore)
Dim streamB As New IsolatedStorageFileStream("TestFileB.Txt", FileMode.Create, isoStore)
Dim streamC As New IsolatedStorageFileStream("TestFileC.Txt", FileMode.Create, isoStore)
Dim streamD As New IsolatedStorageFileStream("TestFileD.Txt", FileMode.Create, isoStore)
streamA.Close()
streamB.Close()
streamC.Close()
streamD.Close()
' There might be a small delay between when the above code
' executes and when the files are created in the store.
' Closing and opening the store in this example ensures that
' the common language runtime has finished creating the files.
isoStore .Close()
isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User Or _
IsolatedStorageScope.Assembly, Nothing, Nothing)
' This line of code calls a method at the bottom of the program
' that puts all the files in isoStore into an IEnumerator.
Dim allFiles As IEnumerator = EnumerateTheStore (isoStore)
Dim totalsize As Long = 0
' This code counts up the sizes of all the stores.
while(allFiles .MoveNext())
Dim store As IsolatedStorageFile
store = CType(allFiles.Current, IsolatedStorageFile)
totalsize += CType(store.UsedSize, Long)
End While
Console.WriteLine("The total size = " + totalsize)
End Sub
' This method returns an enumerator of all the files for a user.
Private Shared Function EnumerateTheStore(isoStore As IsolatedStorageFile) As IEnumerator
Dim e As IEnumerator = IsolatedStorageFile.GetEnumerator(IsolatedStorageScope.User)
Return e
End Function
End Class
using System;
using System.IO;
using System.IO.IsolatedStorage;
using System.Collections;
public class EnumeratingStores
{
public static int Main()
{
// Get an isolated store for this assembly and put it into an
// IsolatedStorageFile object.
IsolatedStorageFile isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User |
IsolatedStorageScope.Assembly, null, null);
// This code creates a few files so that they can be enumerated.
IsolatedStorageFileStream streamA = new IsolatedStorageFileStream("TestFileA.Txt", FileMode.Create, isoStore);
IsolatedStorageFileStream streamB = new IsolatedStorageFileStream("TestFileB.Txt", FileMode.Create, isoStore);
IsolatedStorageFileStream streamC = new IsolatedStorageFileStream("TestFileC.Txt", FileMode.Create, isoStore);
IsolatedStorageFileStream streamD = new IsolatedStorageFileStream("TestFileD.Txt", FileMode.Create, isoStore);
streamA.Close();
streamB.Close();
streamC.Close();
streamD.Close();
// There might be a small delay between when the above code
// executes and when the files are created in the store.
// Closing and opening the store in this example ensures that
// the common language runtime has finished creating the files.
isoStore .Close();
isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User |
IsolatedStorageScope.Assembly, null, null);
// This line of code calls a method at the bottom of the program
// that puts all the files in isoStore into an IEnumerator.
IEnumerator allFiles = EnumerateTheStore (isoStore);
long totalsize = 0;
// This code counts up the sizes of all the stores.
while(allFiles .MoveNext())
{
IsolatedStorageFile store = (IsolatedStorageFile)allFiles.Current;
totalsize += (long)store.UsedSize;
}
Console.WriteLine("The total size = "+totalsize);
return 0;
}
// This method returns an enumerator of all the files for a user.
private static IEnumerator EnumerateTheStore(IsolatedStorageFile isoStore)
{
IEnumerator e = IsolatedStorageFile.GetEnumerator(IsolatedStorageScope.User);
return e;
}
}
using namespace System;
using namespace System::IO;
using namespace System::IO::IsolatedStorage;
using namespace System::Collections;
public ref class EnumeratingStores
{
public:
static int Main()
{
// Get an isolated store for this assembly and put it into an
// IsolatedStorageFile object.
IsolatedStorageFile^ isoStore = IsolatedStorageFile::GetStore(IsolatedStorageScope::User |
IsolatedStorageScope::Assembly, (Type ^)nullptr, (Type ^)nullptr);
// This code creates a few files so that they can be enumerated.
IsolatedStorageFileStream^ streamA =
gcnew IsolatedStorageFileStream("TestFileA.Txt", FileMode::Create, isoStore);
IsolatedStorageFileStream^ streamB =
gcnew IsolatedStorageFileStream("TestFileB.Txt", FileMode::Create, isoStore);
IsolatedStorageFileStream^ streamC =
gcnew IsolatedStorageFileStream("TestFileC.Txt", FileMode::Create, isoStore);
IsolatedStorageFileStream^ streamD =
gcnew IsolatedStorageFileStream("TestFileD.Txt", FileMode::Create, isoStore);
streamA->Close();
streamB->Close();
streamC->Close();
streamD->Close();
// There might be a small delay between when the above code
// executes and when the files are created in the store.
// Closing and opening the store in this example ensures that
// the common language runtime has finished creating the files.
isoStore->Close();
isoStore = IsolatedStorageFile::GetStore(IsolatedStorageScope::User |
IsolatedStorageScope::Assembly, (Type ^)nullptr, (Type ^)nullptr);
// This line of code calls a method at the bottom of the program
// that puts all the files in isoStore into an IEnumerator.
IEnumerator^ allFiles = EnumerateTheStore(isoStore);
long totalsize = 0;
// This code counts up the sizes of all the stores.
while (allFiles->MoveNext())
{
IsolatedStorageFile^ store = (IsolatedStorageFile^)allFiles->Current;
totalsize += (long)store->UsedSize;
}
Console::WriteLine("The total size = " + totalsize);
return 0;
}
// This method returns an enumerator of all the files for a user.
private:
static IEnumerator^ EnumerateTheStore(IsolatedStorageFile^ isoStore)
{
IEnumerator^ e = IsolatedStorageFile::GetEnumerator(IsolatedStorageScope::User);
return e;
}
};
int main()
{
EnumeratingStores::Main();
}