Cómo: Leer y escribir en archivos del almacenamiento aislado
Hay varias formas de abrir un archivo en un almacén usando la clase IsolatedStorageFileStream. Una vez que se ha obtenido una IsolatedStorageFileStream, se puede usar para obtener un StreamReader o un StreamWriter. Con el StreamReader y el StreamWriter, se puede leer y escribir en un archivo de un almacén igual que se hace con cualquier otro archivo. Para obtener más información sobre cómo leer y escribir en un archivo, vea E/S de archivos y secuencias.
Ejemplo de ReadingAndWritingToFiles
El siguiente ejemplo de código obtiene un almacén aislado, crea uno archivo denominado TestStore.txt y escribe "Hello Isolated Storage" en el archivo. A continuación, el código lee el archivo e imprime el resultado en la consola.
Imports System
Imports System.IO
Imports System.IO.IsolatedStorage
Public Module modmain
Sub Main()
' Get an isolated store for this assembly and put it into an
' IsolatedStoreFIle object.
Dim isoStore As IsolatedStorageFile
isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User Or IsolatedStorageScope.Assembly, Nothing, Nothing)
' This code checks to see if the file already exists.
Dim filenames As String()
filenames = isoStore.GetFileNames("TestStore.txt")
Dim file As String
For Each file In filenames
If file = "TestStore.txt" Then
Console.WriteLine("The file already exists!")
Console.WriteLine("Type ""StoreAdm /REMOVE"" at the command line to delete all Isolated Storage for this user.")
Exit Sub
End If
Next
WriteToFile(isoStore)
Console.WriteLine("The file ""TestStore.txt"" contains:")
' Call readFromFile and write the returned string to the console.
Console.WriteLine(ReadFromFile(isoStore))
End Sub
' This method writes "Hello Isolated Storage" to the file.
Private Sub WriteToFile(ByVal isoStore As IsolatedStorageFile)
' Declare a new StreamWriter.
Dim writer As New StreamWriter(New IsolatedStorageFileStream("TestStore.txt", FileMode.CreateNew, isoStore))
' Have the writer write "Hello Isolated Storage" to the store.
writer.WriteLine("Hello Isolated Storage")
writer.Close()
Console.WriteLine("You have written to the file.")
End Sub
' This method reads the first line in the "TestStore.txt" file.
Private Function ReadFromFile(ByVal isoStore As IsolatedStorageFile) As String
' This code opens the TestStore.txt file and reads the string.
Dim reader As New StreamReader(New IsolatedStorageFileStream("TestStore.txt", FileMode.Open, isoStore))
' Read a line from the file and add it to sb.
Dim sb As String
sb = reader.ReadLine
' Close the reader.
reader.Close()
Return sb
End Function
End Module
using System;
using System.IO;
using System.IO.IsolatedStorage;
public class ReadingAndWritingToFiles{
public static int Main(){
// Get an isolated store for this assembly and put it into an
// IsolatedStoreFile object.
IsolatedStorageFile isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Assembly, null, null);
// This code checks to see if the file already exists.
string[] fileNames = isoStore.GetFileNames("TestStore.txt");
foreach (string file in fileNames){
if(file == "TestStore.txt"){
Console.WriteLine("The file already exists!");
Console.WriteLine("Type \"StoreAdm /REMOVE\" at the command line to delete all Isolated Storage for this user.");
// Exit the program.
return 0;
}
}
writeToFile(isoStore);
Console.WriteLine("The file \"TestStore.txt\" contains:");
// Call the readFromFile and write the returned string to the
//console.
Console.WriteLine(readFromFile(isoStore));
// Exit the program.
return 0;
}// End of main.
// This method writes "Hello Isolated Storage" to the file.
private static void writeToFile(IsolatedStorageFile isoStore){
// Declare a new StreamWriter.
StreamWriter writer = null;
// Assign the writer to the store and the file TestStore.
writer = new StreamWriter(new IsolatedStorageFileStream("TestStore.txt", FileMode.CreateNew,isoStore));
// Have the writer write "Hello Isolated Storage" to the store.
writer.WriteLine("Hello Isolated Storage");
writer.Close();
Console.WriteLine("You have written to the file.");
}// End of writeToFile.
// This method reads the first line in the "TestStore.txt" file.
public static String readFromFile(IsolatedStorageFile isoStore){
// This code opens the TestStore.txt file and reads the string.
StreamReader reader = new StreamReader(new IsolatedStorageFileStream("TestStore.txt", FileMode.Open,isoStore));
// Read a line from the file and add it to sb.
String sb = reader.ReadLine();
// Close the reader.
reader.Close();
// Return the string.
return sb.ToString();
}// End of readFromFile.
}
Vea también
Referencia
IsolatedStorageFile
IsolatedStorageFileStream
System.IO.FileMode
System.IO.FileAccess
System.IO.StreamReader
System.IO.StreamWriter