Lewis

Lewis

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BinaryFormatter Deserialize result lost when method exits

Nov 18 2010 3:55 PM

Hi, the title says it all. I'm baffled. When I use the three (deserialize) stmts in-line, it all works. But when the stmts are in a specialized method, I lose the deserialized result. The code:
using
System;
using
System.Collections.Generic;
using
System.Windows;
using
System.Windows.Controls;
using
System.Windows.Data;
using
System.Runtime.Serialization.Formatters.Binary;
using
System.IO;
using
System.Windows.Documents;
using
System.Windows.Input;
namespace
WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
[
Serializable]
public class aclass
{
public int level;
public string id;
}
public List<aclass> acc = new List<aclass>();
public List<aclass> acci = new List<aclass>(); //test
public MainWindow()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
aclass ac;
for (int i = 0; i < 5; i++)
{
ac =
new aclass();
ac.level = 0;
ac.id =
"";
ac.level = i * 4;
ac.id = (i * 12).ToString();
acc.Add(ac);
}
for (int i = 0; i < 5; i++)
{
Console.WriteLine("Level {0}, ID {1}", acc[i].level, acc[i].id);
}
SaveAsBinaryFormat(acc,
"TestSecData.dat");
LoadFromBinaryFile(
"TestSecData.dat");
//works properly if I put the 3 deserialize logic stmts here (instead of calling "LoadFromBinaryFile"):
//BinaryFormatter binFormat = new BinaryFormatter();
//Stream fStream = File.OpenRead("TestSecData.dat");
//List<aclass> acci = (List<aclass>)binFormat.Deserialize(fStream);
}
//------------------------------------------------------------------------------------------------------
static void SaveAsBinaryFormat(object objGraph, string fileName)
{
BinaryFormatter binFormat = new BinaryFormatter();
using (Stream fStream = new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.None))
{
binFormat.Serialize(fStream, objGraph);
}
}
//------------------------------------------------------------------------------------------------------
static void LoadFromBinaryFile(string fileName)
{
BinaryFormatter binFormat = new BinaryFormatter();
using (Stream fStream = File.OpenRead(fileName))
{
List<aclass> acci = (List<aclass>)binFormat.Deserialize(fStream);
}
//if I stop here and examine 'acci', it shows that the deserialization worked, and 'acci' is loaded
// (with count of 5 'aclass' items)
}
//but.... 'acci' is cleared here when the method is exited! WHY?
}
}
Would appreciate any help.  -Lew
 

Answers (1)