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CSharp SDK await dbx.Files.UploadAsync(...) object gets disposed before upload
Hi, although I've mastered uploading text content to Dropbox, when trying to upload byte content (typical file, 18 MB), I get the error:
"ERROR: The object was used after being disposed"
The code is as follows, and the error was thrown in a try-catch in the second code block:
using (var dbx = new DropboxClient("My_Token"))
{
await UploadToDropBox(dbx, "/test", IPATargetFileName, fullPathToFileToUpload);
}
// the method called is in the next code block
async Task UploadToDropBox(DropboxClient dbx, string dropboxfolder, string dropboxfilename, string filepathtoUpload)
{
using (var mem = new MemoryStream(File.ReadAllBytes(filepathtoUpload)))
{
try
{
var updated = await dbx.Files.UploadAsync(
dropboxfolder + "/" + dropboxfilename,
WriteMode.Overwrite.Instance,
body: mem);
}
catch (Exception ex)
{
LogMessage(string.Format(" : ERROR: {0}", ex.Message));
}
}
}
I'm, guessing that this is a MemoryStream / FileStream problem but the API example only shows how to upload a text file.
Kind regards,
Anthony
21 Replies
Replies have been turned off for this discussion
Incidentally, I had tried the following pattern but get the same error:
using (FileStream fileStream = File.OpenRead(filePath)) { // passing memStream into the above dbx.Files.UploadAsync(... etc) method,
// Curiously, the filestream option adds a file of zero bytes to my dropbox folder. Error same as above. }Anthony
This fails as well, with the same error. The process takes around 7 minutes (for an 18 mb file) before failure.
using (var dbx = new DropboxClient("My Key"))
{
using (FileStream fsSource = new FileStream(filepathtoUpload,
FileMode.Open, FileAccess.Read))
{
try
{
var updated = await dbx.Files.UploadAsync(
dropboxfolder + "/" + dropboxfilename,
WriteMode.Overwrite.Instance,
body: fsSource);
}
catch (Exception ex)
{
LogMessage(string.Format(" : ERROR: {0}", ex.Message));
throw new Exception(ex.Message);
}
}
}
Qiming Y.Dropbox Staff
Hi,
Could you provide us some additional information as below? It would very helpful for us to figure out what went wrong.
1. Does this error also occur for smaller size file (like 4mb or smaller)?
2. Could you provide the stack trace for the exception?
Hi Qiming,
I'll run a 4MB test separately, but here's the stack trace reported by Jenkins at the end of the CI run.
On a side-note, we're hoping to use Dropbox for all our CI needs as relate to mobile phone app development, in which case file-size could be up to 150 MB ~ and which should quickly cause our clients to upgrade to Dropbox's paid version.
Stack trace as follows!
Kind regards,
Anthony
Unhandled Exception: System.AggregateException: One or more errors occurred. ---> System.Exception: The object was used after being disposed. at CI.CIPostBuildTask+<UploadToDropBox>c__async2.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[System.Boolean].GetResult () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional (Boolean includeTaskCanceledExceptions) [0x00000] in <filename unknown>:0 at System.Threading.Tasks.Task.Wait (Int32 millisecondsTimeout, CancellationToken cancellationToken) [0x00000] in <filename unknown>:0 at System.Threading.Tasks.Task.Wait () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 ---> (Inner Exception #0) System.Exception: The object was used after being disposed. at CI.CIPostBuildTask+<UploadToDropBox>c__async2.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[System.Boolean].GetResult () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 <--- [ERROR] FATAL UNHANDLED EXCEPTION: System.AggregateException: One or more errors occurred. ---> System.Exception: The object was used after being disposed. at CI.CIPostBuildTask+<UploadToDropBox>c__async2.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[System.Boolean].GetResult () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional (Boolean includeTaskCanceledExceptions) [0x00000] in <filename unknown>:0 at System.Threading.Tasks.Task.Wait (Int32 millisecondsTimeout, CancellationToken cancellationToken) [0x00000] in <filename unknown>:0 at System.Threading.Tasks.Task.Wait () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 ---> (Inner Exception #0) System.Exception: The object was used after being disposed. at CI.CIPostBuildTask+<UploadToDropBox>c__async2.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[System.Boolean].GetResult () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 <---
Hi Qiming, I just ran a test using a 3MB file and it uploaded successfully (but the 18MB fails with the above stack-trace).
Just to clarify, the code that affected the upload was:
await UploadToDropBox("/test", IPATargetFileName, CIConfigDirectory + "/test.zip");
and the method called is:
async Task UploadToDropBox(string dropboxfolder, string dropboxfilename, string filepathtoUpload)
{
using (var dbx = new DropboxClient("My Key"))
{
using (FileStream fsSource = new FileStream(filepathtoUpload,
FileMode.Open, FileAccess.Read))
{
try
{
var updated = await dbx.Files.UploadAsync(
dropboxfolder + "/" + dropboxfilename,
WriteMode.Overwrite.Instance,
body: fsSource);
}
catch (Exception ex)
{
LogMessage(string.Format(" : ERROR: {0}", ex.Message));
throw new Exception(ex.Message);
}
}
}
}
- Qiming Y.
Hi,
I think the way you throw the exception loses the stack trace of the actual exception. Instead of throw new Exception(ex.Message); could you just do throw; instead?
Hi Qiming,
Here is the stack trace after the change to throw.
Unhandled Exception: System.AggregateException: One or more errors occurred. ---> System.ObjectDisposedException: The object was used after being disposed. at System.Net.WebConnection.EndWrite (System.Net.HttpWebRequest request, Boolean throwOnError, IAsyncResult result) [0x00000] in <filename unknown>:0 at System.Net.WebConnectionStream.WriteAsyncCB (IAsyncResult r) [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable+ConfiguredTaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[System.Net.Http.HttpResponseMessage].GetResult () [0x00000] in <filename unknown>:0 at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[Dropbox.Api.Files.FileMetadata].GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<UploadToDropBox>c__async2.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[System.Boolean].GetResult () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional (Boolean includeTaskCanceledExceptions) [0x00000] in <filename unknown>:0 at System.Threading.Tasks.Task.Wait (Int32 millisecondsTimeout, CancellationToken cancellationToken) [0x00000] in <filename unknown>:0 at System.Threading.Tasks.Task.Wait () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 ---> (Inner Exception #0) System.ObjectDisposedException: The object was used after being disposed. at System.Net.WebConnection.EndWrite (System.Net.HttpWebRequest request, Boolean throwOnError, IAsyncResult result) [0x00000] in <filename unknown>:0 at System.Net.WebConnectionStream.WriteAsyncCB (IAsyncResult r) [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable+ConfiguredTaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[System.Net.Http.HttpResponseMessage].GetResult () [0x00000] in <filename unknown>:0 at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[Dropbox.Api.Files.FileMetadata].GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<UploadToDropBox>c__async2.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[System.Boolean].GetResult () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 <--- [ERROR] FATAL UNHANDLED EXCEPTION: System.AggregateException: One or more errors occurred. ---> System.ObjectDisposedException: The object was used after being disposed. at System.Net.WebConnection.EndWrite (System.Net.HttpWebRequest request, Boolean throwOnError, IAsyncResult result) [0x00000] in <filename unknown>:0 at System.Net.WebConnectionStream.WriteAsyncCB (IAsyncResult r) [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable+ConfiguredTaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[System.Net.Http.HttpResponseMessage].GetResult () [0x00000] in <filename unknown>:0 at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[Dropbox.Api.Files.FileMetadata].GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<UploadToDropBox>c__async2.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[System.Boolean].GetResult () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional (Boolean includeTaskCanceledExceptions) [0x00000] in <filename unknown>:0 at System.Threading.Tasks.Task.Wait (Int32 millisecondsTimeout, CancellationToken cancellationToken) [0x00000] in <filename unknown>:0 at System.Threading.Tasks.Task.Wait () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 ---> (Inner Exception #0) System.ObjectDisposedException: The object was used after being disposed. at System.Net.WebConnection.EndWrite (System.Net.HttpWebRequest request, Boolean throwOnError, IAsyncResult result) [0x00000] in <filename unknown>:0 at System.Net.WebConnectionStream.WriteAsyncCB (IAsyncResult r) [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable+ConfiguredTaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[System.Net.Http.HttpResponseMessage].GetResult () [0x00000] in <filename unknown>:0 at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[Dropbox.Api.Files.FileMetadata].GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<UploadToDropBox>c__async2.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0 at CI.CIPostBuildTask+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 at System.Runtime.CompilerServices.TaskAwaiter`1[System.Boolean].GetResult () [0x00000] in <filename unknown>:0 at CI.Postbuild.ConsoleApp.Program+<Run>c__async0.MoveNext () [0x00000] in <filename unknown>:0 <---
- Qiming Y.
Thanks for your stack trace. I think you are supposed to get a TaskCancelationException given default time out of 100 sec for HttpClient. However if you are using mono, you may get a ObjectDisposedException due to the bug in
http://forums.xamarin.com/discussion/44502/objectdisposedexception-when-canceling-postasync
In general, to deal with large file upload, we would suggest to use UploadSession endpoint so that you can split the file and upload them via multiple requests. 4 mb would be a good chunk size.
Hi Qiming,
Do you have any references for this, searching Google for "UploadSession endpoint" does not yield any results and I am unsure of what protocol you are referring to?
Does Dropbox have any intention of including this feature in it's CSharp SDK?
Steve M.He's talking about UploadSessionStartAsync, UploadSessionAppendAsync, and UploadSessionFinishAsync in the .NET SDK.
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