c# - MemoryStream は、独自の using ステートメントでアクセスしようとすると、ObjectDisposedException をスローします。

Question

ストリームを使用して、読み込み時に jpeg を段階的に表示しようとしています。これは以前は正常に機能していましたが、今朝コードを実行しようとしたところ、このエラーのために画像を読み込めなくなりました。関連するコードは次のとおりです。

using (WebClient wc = new WebClient())
using (Stream streamRemote = wc.OpenRead(url))
using (Stream streamLocal = new MemoryStream((int)fileSize))
{
    int byteSize = 0;
    byte[] buffer = new byte[fileSize];

    while ((byteSize = streamRemote.Read(buffer, 0, buffer.Length)) > 0)
    {
        streamLocal.Write(buffer, 0, byteSize); // Error is here.
        bytesDownloaded += byteSize;

        int progressPercentage = (int)(bytesDownloaded / buffer.Length) * 100;

        if (progressPercentage % 10 == 0)
        {
            imageLoader.ReportProgress(progressPercentage, streamLocal);
        }
    }
}

// Exception thrown: 'System.ObjectDisposedException' in mscorlib.dll
// An exception of type 'System.ObjectDisposedException' occurred in mscorlib.dll but was not handled in user code
// Cannot access a closed Stream.

After using Console.WriteLine at the end of the that final using statement (after the while loop), I've found that the code seems to run through the loop a couple times before throwing that exception.

I don't understand why I would be trying to access a closed stream when the code is clearly happening within the using statement that the stream is declared in. I also don't understand why it worked the other day and doesn't now. Most of the code for this comes from here, so the rest of my method can be found there. Mine isn't much different apart from some variable name changes and other small changes. Can anyone help fix this?

Edit: My _ProgressChanged event:

private void ImageLoader_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    if (!fileFailed)
    {
        Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal,
        new Action(delegate ()
        {
            try
            {
                using (MemoryStream stream = e.UserState as MemoryStream)
                {
                    BitmapImage bmp = new BitmapImage();
                    bmp.BeginInit();
                    using (MemoryStream ms = new MemoryStream(stream.ToArray())) bmp.StreamSource = ms;
                    bmp.EndInit();

                    img_CurrentImage.Source = bmp;
                }
            }
            // A few catch statements here - none of the exceptions here are being thrown anyway so I'll omit the catch statements
        }));
    }
}