I have read the topic: ASP.NET Core : Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead but for my case I can't understand, how to fix it:
I have controller method:
public async Task<IActionResult> Upload()
{
var boundary = MultipartRequestHelper.GetBoundary(MediaTypeHeaderValue.Parse(Request.ContentType), _defaultFormOptions.MultipartBoundaryLengthLimit);
var reader = new MultipartReader(boundary.ToString(), HttpContext.Request.Body);
var section = await reader.ReadNextSectionAsync();
List<FileApi> uploadedFiles = new List<FileApi>();
while (section != null)
{
ContentDispositionHeaderValue contentDisposition;
var hasContentDispositionHeader = ContentDispositionHeaderValue.TryParse(section.ContentDisposition, out contentDisposition);
if (hasContentDispositionHeader)
{
if (MultipartRequestHelper.HasFileContentDisposition(contentDisposition))
{
var fileDto = await _zendeskManageFileService.UploadFileAsync(contentDisposition.FileName.ToString(), section.Body);
uploadedFiles.Add(_mapper.Map<FileApi>(fileDto));
}
else if (MultipartRequestHelper.HasFormDataContentDisposition(contentDisposition))
{
var errorNoFile = new ErrorResponse
{
Error = new Error
{
Code = "NoFile",
Message = $"Expected a file, no form data content",
}
};
return BadRequest(errorNoFile);
}
}
section = await reader.ReadNextSectionAsync();
}
return Created("", uploadedFiles);
}
when 2 or more files I get the exception on the second file on line:
var fileDto = await _zendeskManageFileService.UploadFileAsync(contentDisposition.FileName.ToString(), section.Body);
UploadFileAsync has the following code:
public async Task<FileDto> UploadFileAsync(string filename, Stream stream)
{
if (stream.Position != 0)
stream.Position = 0;
var upload = await _zendeskClient.Attachments.UploadAsync(filename, stream);
FileDto fileDto = new FileDto
{
Id = upload.Id,
ContentType = upload.Attachment.ContentType,
Token = upload.Token,
ContentUrl = upload.Attachment.ContentUrl,
FileName = upload.Attachment.FileName,
Size = upload.Attachment.Size
};
return fileDto;
}
public async Task<Upload> UploadAsync(
string fileName,
Stream inputStream,
string token = null,
CancellationToken cancellationToken = default(CancellationToken))
{
var attachmentResponse = await ExecuteRequest(async (client, canToken) =>
await client.PostAsBinaryAsync(
UploadsResourceUri + $"?filename={fileName}&token={token}",
inputStream,
fileName,
canToken)
.ConfigureAwait(false),
"UploadAsync",
cancellationToken)
.ThrowIfUnsuccessful("attachments#upload-files", HttpStatusCode.Created)
.ReadContentAsAsync<UploadResponse>();
return attachmentResponse.Upload;
}
public static async Task<HttpResponseMessage> PostAsBinaryAsync(
this HttpClient client,
string requestUri,
Stream inputStream,
string fileName,
CancellationToken cancellationToken = default(CancellationToken))
{
using (var stream = new MemoryStream())
{
inputStream.CopyTo(stream);
using (var content = new ByteArrayContent(stream.ToArray()))
{
content.Headers.ContentType = new MediaTypeHeaderValue("application/binary");
return await client.PostAsync(
requestUri,
content,
cancellationToken)
.ConfigureAwait(false);
}
}
}
internal static async Task<T> ReadContentAsAsync<T>(
this Task<HttpResponseMessage> response,
JsonConverter converter = null)
where T : class
{
var unwrappedResponse = await response;
if (unwrappedResponse == null)
return null;
if (converter == null)
{
return await unwrappedResponse
.Content
.ReadAsAsync<T>();
}
return await unwrappedResponse
.Content
.ReadAsAsync<T>(converter);
}
protected async Task<HttpResponseMessage> ExecuteRequest(
Func<HttpClient, CancellationToken, Task<HttpResponseMessage>> requestBodyAccessor,
string scope,
CancellationToken cancellationToken = default(CancellationToken))
{
using (LoggerScope(Logger, scope))
using (var client = ApiClient.CreateClient())
{
return await requestBodyAccessor(client, cancellationToken);
}
}
I tried to create and use attribute to set AllowSynchronousIO = true
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class AllowSynchronousIOAttribute : ActionFilterAttribute
{
public AllowSynchronousIOAttribute()
{
}
public override void OnResultExecuting(ResultExecutingContext context)
{
var syncIOFeature = context.HttpContext.Features.Get<IHttpBodyControlFeature>();
if (syncIOFeature != null)
{
syncIOFeature.AllowSynchronousIO = true;
}
}
}
but it could not help. How to solve this problem for my case?
stack error is:
System.InvalidOperationException: Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead. at Microsoft.AspNetCore.Server.IIS.Core.HttpRequestStream.Read(Byte[] buffer, Int32 offset, Int32 count) at Microsoft.AspNetCore.Server.IIS.Core.WrappingStream.Read(Byte[] buffer, Int32 offset, Int32 count) at Microsoft.AspNetCore.WebUtilities.BufferedReadStream.EnsureBuffered(Int32 minCount) at Microsoft.AspNetCore.WebUtilities.MultipartReaderStream.Read(Byte[] buffer, Int32 offset, Int32 count) at System.IO.Stream.CopyTo(Stream destination, Int32 bufferSize) at System.IO.Stream.CopyTo(Stream destination) at ZendeskApi.Client.Extensions.HttpRequestExtensions.PostAsBinaryAsync(HttpClient client, String requestUri, Stream inputStream, String fileName, CancellationToken cancellationToken) in C:\www\TMS\Libraries\ZendeskApi.Client\Extensions\HttpRequestExtensions.cs:line 75 at ZendeskApi.Client.Resources.AttachmentsResource.<>c__DisplayClass4_0.<b__0>d.MoveNext() in C:\www\TMS\Libraries\ZendeskApi.Client\Resources\AttachmentsResource.cs:line 45 --- End of stack trace from previous location where exception was thrown --- at ZendeskApi.Client.Resources.AbstractBaseResource
1.ExecuteRequest(Func3 requestBodyAccessor, String scope, CancellationToken cancellationToken) in C:\www\TMS\Libraries\ZendeskApi.Client\Resources\AbstractBaseResource.cs:line 41 at ZendeskApi.Client.Extensions.HttpResponseExtensions.ThrowIfUnsuccessful(Task1 response, String helpDocLink, Nullable1 expected, String helpDocLinkPrefix) in C:\www\TMS\Libraries\ZendeskApi.Client\Extensions\HttpResponseExtensions.cs:line 90 at ZendeskApi.Client.Extensions.HttpResponseExtensions.ReadContentAsAsync[T](Task`1 response, JsonConverter converter) in C:\www\TMS\Libraries\ZendeskApi.Client\Extensions\HttpResponseExtensions.cs:line 45 at ZendeskApi.Client.Resources.AttachmentsResource.UploadAsync(String fileName, Stream inputStream, String token, CancellationToken cancellationToken) in C:\www\TMS\Libraries\ZendeskApi.Client\Resources\AttachmentsResource.cs:line 44 at Tms.ZendeskCore.Services.ZendeskManageFileService.UploadFileAsync(String filename, Stream stream) in C:\www\TMS\Libraries\Tms.ZendeskCore\Services\ZendeskManageFileService.cs:line 24 at Tms.WebApi.Controllers.Support.ManageFileApiController.Upload() in C:\www\TMS\Web\Tms.WebApi\Controllers\Support\ManageFileApiController.cs:line 86 at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Logged|12_1(ControllerActionInvoker invoker) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Logged|17_1(ResourceInvoker invoker) at Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger) at Microsoft.AspNetCore.Builder.Extensions.MapWhenMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)HEADERS ======= Accept: / Accept-Encoding: gzip, deflate, br Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...7KlZaAycWieBAvkk2WUuTkI_UqNu9IzUhk0JAeLQkvU Cache-Control: no-cache Connection: keep-alive Content-Length: 114796 Content-Type: multipart/form-data; boundary=--------------------------271301571241092277677258 Host: localhost:44373 User-Agent: PostmanRuntime/7.28.3 Postman-Token: 4fd12960-9bae-45f5-8ae1-e4a5080b887b
