Enumerating Stores
You can enumerate all isolated stores for the current user using the IsolatedStorageFile static method GetEnumerator. GetEnumerator takes an IsolatedStorageScope value and returns an IsolatedStorageFile enumerator. User is the only IsolatedStorageScope value supported. To enumerate stores, you must have the IsolatedStorageFilePermission that specifies the IsolatedStorageContainment value AdministerIsolatedStorageByUser. When called with the IsolatedStorageScope value User, GetEnumerator returns an array of IsolatedStorageFiles that are defined for the current user.
EnumeratingStores Example
The following code example obtains a store isolated by user and assembly and creates a few files. The GetEnumerator method is called and the result is placed into an IEnumerator. The code then loops through the IEnumerator, adding up the sizes of the files, and reports the result to the console. The actual enumeration takes place in the private EnumerateTheStore method that is separated from the rest of the code at the bottom of the file for clarity.
Imports System
Imports System.IO
Imports System.IO.IsolatedStorage
Imports System.Collections
Public Module modmain
Sub Main()
' Get an isolated store for this assembly and put it into an
' IsolatedStorageFile object.
Dim isoStore As IsolatedStorageFile
isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User Or IsolatedStorageScope.Assembly Or IsolatedStorageScope.Domain, Nothing, Nothing)
' This code creates a few files so that they can be enumerated.
Dim FileA As IsolatedStorageFileStream
FileA = New IsolatedStorageFileStream("TestFileA.Txt", FileMode.Create, isoStore)
Dim FileB As IsolatedStorageFileStream
FileB = New IsolatedStorageFileStream("TestFileB.Txt", FileMode.Create, isoStore)
Dim FileC As IsolatedStorageFileStream
FileC = New IsolatedStorageFileStream("TestFileC.Txt", FileMode.Create, isoStore)
Dim FileD As IsolatedStorageFileStream
FileD = New IsolatedStorageFileStream("TestFileD.Txt", FileMode.Create, isoStore)
FileA.Close()
FileB.Close()
FileC.Close()
FileD.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
allFiles = EnumerateTheStore(isoStore)
Dim totalSize As Long
' This code counts up the sizes of all the stores.
While (allFiles.MoveNext())
Dim store As IsolatedStorageFile
' Explicity convert the current object in allFiles
' into an IsolatedStorageFile.
store = CType(allFiles.Current, IsolatedStorageFile)
' Find the current size of the IsolatedStorageFile as
' an UInt64, and convert that to a string. Get the value
' of the string as a double and convert that to a Long.
totalSize += totalSize + CLng(Val(store.CurrentSize.ToString))
End While
' Print out the value.
System.Console.WriteLine("The size of all the isolated stores in the user scope = " + totalSize.ToString)
End Sub
Function EnumerateTheStore(ByVal isoStore As IsolatedStorageFile) As IEnumerator
Return isoStore.GetEnumerator(IsolatedStorageScope.User)
End Function
End Module
[C#]
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.CurrentSize;
}
Console.WriteLine("The total size = "+totalsize);
return 0;
}
// This method returns an IEnucontaining all the files for a user.
private static IEnumerator EnumerateTheStore(IsolatedStorageFile isoStore){
IEnumerator e = IsolatedStorageFile.GetEnumerator(IsolatedStorageScope.User);
return e;
}
}