讀取和寫入至檔案
有一些方法可以讓您使用 IsolatedStorageFileStream 類別來開啟存放區內的檔案。一旦取得 IsolatedStorageFileStream，就可以用它來取得 StreamReader 或 StreamWriter。使用 StreamReader 和 StreamWriter，您就可以讀取或寫入存放區中的檔案，就跟您處理其他檔案一樣。如需更多檔案讀取和寫入的廣泛討論，請參閱檔案和資料流 I/O。
ReadingAndWritingToFiles 範例
下列程式碼範例會取得隔離存放區、建立名為 TestStore.txt 的檔案，並將 "Hello Isolated Storage" 寫入至檔案。程式碼接著讀取檔案並印出結果至主控台。
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.
}
請參閱
參考
IsolatedStorageFile
IsolatedStorageFileStream
System.IO.FileMode
System.IO.FileAccess
System.IO.StreamReader
System.IO.StreamWriter