Bug 5366 - Ver 4.2.2 - System.ObjectDisposedException using FileStream.Length and MemoryStream.Length
Summary: Ver 4.2.2 - System.ObjectDisposedException using FileStream.Length and Memory...
Status: RESOLVED FIXED
Alias: None
Product: Android
Classification: Xamarin
Component: BCL Class Libraries ()
Version: 4.2.x
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2012-05-28 06:01 UTC by Derek Mitchell
Modified: 2012-05-31 13:41 UTC (History)
2 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED FIXED

Description Derek Mitchell 2012-05-28 06:01:17 UTC
Please note this is an issue introduced for Ver 4.2.2!!!

In ver 4.2.1 - the code works fine.

I'm getting the following error in ver 4.2.2:

System.ObjectDisposedException: The object was used after being disposed.

when calling fs.Length in the code below.

using (Android.Graphics.Bitmap bitmap = Android.Graphics.BitmapFactory.DecodeByteArray(jpegData, 0, jpegData.Length))
{
    using (System.IO.FileStream fs = new System.IO.FileStream(Program.AppImageFileSpec, System.IO.FileMode.Create))
    {
        bitmap.Compress(Android.Graphics.Bitmap.CompressFormat.Jpeg, 75, fs);
        var sizeInfo = fs.Length;// System.ObjectDisposedException: The object was used after being disposed.
        fs.Close();
    }
}

The same also occurs in this code dealing with the MemoryStream:
using (MemoryStream ms = new MemoryStream())
{
    bitmap.Compress(Bitmap.CompressFormat.Jpeg, 75, ms);
    TaskAssignment.TaskImage.ImageAsImage = ms.ToArray();
    sizeInfo = DBT.helpers.ceHelper.GetSpaceDescription((ulong)ms.Length);
    ms.Close();
}

Looking in the 4.2.2 notes I saw this: 

Reduce lifetime of wrapped Streams in InputStreamAdapter, InputStreamInvoker, OutputStreamAdapter, OutputStreamInvoker. Disposing of the wrapper instance will now dispose the wrapped instance. 

Is there any chance this is related?

Is there an interim workaround where I can get the Length?
Comment 1 Jonathan Pryor 2012-05-31 13:41:35 UTC
This should be fixed by commit d5363f65, and will be fixed in the 4.2.3 release.

I'm sorry for the inconvenience.