診斷工具錯誤Newtonsoft.Json.JsonReaderException：解析值時遇到意外的字符：<。 <：路徑'，線0，位置0

Question

我最近剛剛獲得在我的診斷工具，錯誤適用於Visual Studio 2015年

Newtonsoft.Json.JsonReaderException：分析值意外字符遇到。路徑''，第0行，位置0.

我已經打開了該工具的日誌記錄並具有下面的堆棧跟蹤，看起來它與DataWarehouseRestWebHost有關，因爲在工具發出請求之後發生錯誤

System.AggregateException: One or more errors occurred. ---> Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: <. Path '', line 0, position 0. 
    at Newtonsoft.Json.JsonTextReader.ParseValue() 
    at Newtonsoft.Json.JsonTextReader.ReadInternal() 
    at Newtonsoft.Json.JsonTextReader.Read() 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType(JsonReader reader, JsonContract contract, Boolean hasConverter) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent) 
    at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType) 
    at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings) 
    at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings) 
    at Microsoft.DiagnosticsHub.VisualStudio.DataWarehouseRestWebHost.<ProcessErrorResponse>d__8.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() 
    at Microsoft.DiagnosticsHub.VisualStudio.DataWarehouseRestWebHost.<Request>d__7.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.DiagnosticsHub.VisualStudio.DataWarehouse.DataWarehouseInstance.<InitializeDataWarehouseInternal>d__52.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.DiagnosticsHub.VisualStudio.Collectors.CollectorService.StandardClientCollector.<OnStartCollection>d__27.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) 
    at Microsoft.DiagnosticsHub.VisualStudio.Runtime.PerformanceDebuggerSession.<StartCollectionAsync>d__13.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.DiagnosticsHub.Sessions.SessionBase.<>c__DisplayClass51_0.<<ContinueCurrentTaskWith>b__0>d.MoveNext() 
--- End of inner exception stack trace --- 
---> (Inner Exception #0) Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: <. Path '', line 0, position 0. 
    at Newtonsoft.Json.JsonTextReader.ParseValue() 
    at Newtonsoft.Json.JsonTextReader.ReadInternal() 
    at Newtonsoft.Json.JsonTextReader.Read() 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType(JsonReader reader, JsonContract contract, Boolean hasConverter) 
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent) 
    at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType) 
    at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings) 
    at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings) 
    at Microsoft.DiagnosticsHub.VisualStudio.DataWarehouseRestWebHost.<ProcessErrorResponse>d__8.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() 
    at Microsoft.DiagnosticsHub.VisualStudio.DataWarehouseRestWebHost.<Request>d__7.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.DiagnosticsHub.VisualStudio.DataWarehouse.DataWarehouseInstance.<InitializeDataWarehouseInternal>d__52.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.DiagnosticsHub.VisualStudio.Collectors.CollectorService.StandardClientCollector.<OnStartCollection>d__27.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) 
    at Microsoft.DiagnosticsHub.VisualStudio.Runtime.PerformanceDebuggerSession.<StartCollectionAsync>d__13.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
    at Microsoft.DiagnosticsHub.Sessions.SessionBase.<>c__DisplayClass51_0.<<ContinueCurrentTaskWith>b__0>d.MoveNext() 

Answer 1

遲到的答案，但比沒有答案更好，也許它可以幫助別人。 我通過將post參數的屬性"URL ENCODE"設置爲False來解決此問題。

這是因爲json表單發佈參數不一定是html編碼。