{"Message":"已取消该操作。","Source":"mscorlib","StackTrace":" 在 System.Threading.CancellationToken.ThrowOperationCanceledException()
在 System.Net.Http.HttpContentExtensions.<ReadAsAsyncCore>d__17`1.MoveNext()
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
在 System.Web.Http.ModelBinding.FormatterParameterBinding.<ExecuteBindingAsyncCore>d__18.MoveNext()
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
在 System.Web.Http.Controllers.HttpActionBinding.<ExecuteBindingAsyncCore>d__12.MoveNext()
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
在 System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
在 System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__3.MoveNext()
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
在 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
在 System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__6.MoveNext()","TargetSite":{"Name":"ThrowOperationCanceledException","AssemblyName":"mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089","ClassName":"System.Threading.CancellationToken","Signature":"Void ThrowOperationCanceledException()","Signature2":"System.Void ThrowOperationCanceledException()","MemberType":8,"GenericArguments":null}}

目前找不到问题在哪里？  是否是线程数不够了？