C# DeflateStream ReadAsync(Byte[], Int32, Int32)

[ComVisibleAttribute(false)]//from w  w w.  j a  va  2s . c  om
[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public Task<int> ReadAsync(
  byte[] buffer,
  int offset,
  int count
)

//  w  ww. j  a  v  a 2 s.  c  o m
using System;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.IO;

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private async void Button_Click(object sender, RoutedEventArgs e)
    {
        UnicodeEncoding uniencoding = new UnicodeEncoding();
        string filename = @"c:\Users\log.txt";
        byte[] result;

        using (FileStream SourceStream = File.Open(filename, FileMode.Open))
        {
            result = new byte[SourceStream.Length];
            await SourceStream.ReadAsync(result, 0, (int)SourceStream.Length);
        }

        UserInput.Text = uniencoding.GetString(result);
    }
}