无法强制转换类型为'Newtonsoft.Json.Linq.JObject'键入'system

本文关键字：Linq Json JObject 键入 system Newtonsoft 类型 转换 | 更新日期: 2023-09-27 18:04:14

我得到以下异常试图反序列化一个web api调用-消息是模糊的，所以我不能理解发生了什么-这种强制转换在其他情况下工作不确定这里有什么问题:

异常:

  InnerException: System.Reflection.TargetInvocationException
   _HResult=-2146232828
   _message=Exception has been thrown by the target of an invocation.
   HResult=-2146232828
   IsTransient=false
   Message=Exception has been thrown by the target of an invocation.
   Source=mscorlib
   StackTrace:
        at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
        at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
        at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
        at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
        at Newtonsoft.Json.Serialization.JsonContract.<>c__DisplayClass1.<CreateSerializationCallback>b__0(Object o, StreamingContext context)
        at Newtonsoft.Json.Serialization.JsonContract.InvokeOnDeserialized(Object o, StreamingContext context)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.OnDeserialized(JsonReader reader, JsonContract contract, Object value)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateISerializable(JsonReader reader, JsonISerializableContract contract, JsonProperty member, String id)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
        at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
        at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
        at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)
        at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.ReadFromStream(Type type, Stream readStream, Encoding effectiveEncoding, IFormatterLogger formatterLogger)
        at System.Net.Http.Formatting.JsonMediaTypeFormatter.ReadFromStream(Type type, Stream readStream, Encoding effectiveEncoding, IFormatterLogger formatterLogger)
        at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.ReadFromStream(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
        at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
     --- 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 System.Net.Http.HttpContentExtensions.<ReadAsAsyncCore>d__0`1.MoveNext()
   InnerException: System.InvalidCastException
        _HResult=-2147467262
        _message=Unable to cast object of type 'Newtonsoft.Json.Linq.JObject' to type 'System.Runtime.Serialization.ISafeSerializationData'.
        HResult=-2147467262
        IsTransient=false
        Message=Unable to cast object of type 'Newtonsoft.Json.Linq.JObject' to type 'System.Runtime.Serialization.ISafeSerializationData'.
        Source=mscorlib
        StackTrace:
             at System.Runtime.Serialization.SafeSerializationManager.CompleteDeserialization(Object deserializedObject)
             at System.Exception.OnDeserialized(StreamingContext context)
        InnerException:
我代码:

public SensoriaApiResult<T> PostSensoriaApiResult(object body)
    {
        HttpClient client = SetupClient();
        HttpResponseMessage response;
        response = client.PostAsJsonAsync(url, body).Result;
        SensoriaApiResult<T> result = response.Content.ReadAsAsync<SensoriaApiResult<T>>().Result;
        return result;
    }

Json返回:

{"StatusCode":500,"APIResult":null,"HttpError":{"Message":"Sensoria API internal error","SensoriaApiErrorCode":983041},"Exception":{"ClassName":"System.Data.Entity.Infrastructure.DbUpdateException","Message":"An error occurred while updating the entries. See the inner exception for details.","Data":{},"InnerException":{"ClassName":"System.Data.Entity.Core.UpdateException","Message":"An error occurred while updating the entries. See the inner exception for details.","Data":{},"InnerException":{"Errors":[{"source":".Net SqlClient Data Provider","number":547,"state":0,"errorClass":16,"server":".","message":"The INSERT statement conflicted with the FOREIGN KEY constraint '"FK_UserBase.ClosetItems_Catalog.Products'". The conflict occurred in database '"Sensoria.Knowledge.Database'", table '"dbo.Catalog.Products'", column 'ProductId'.","procedure":"","lineNumber":1,"win32ErrorCode":0},{"source":".Net SqlClient Data Provider","number":3621,"state":0,"errorClass":0,"server":".","message":"The statement has been terminated.","procedure":"","lineNumber":1,"win32ErrorCode":0}],"ClientConnectionId":"7b976c29-59ff-491c-a3aa-01750e17cb36","ClassName":"System.Data.SqlClient.SqlException","Message":"The INSERT statement conflicted with the FOREIGN KEY constraint '"FK_UserBase.ClosetItems_Catalog.Products'". The conflict occurred in database '"Sensoria.Knowledge.Database'", table '"dbo.Catalog.Products'", column 'ProductId'.'r'nThe statement has been terminated.","Data":{"HelpLink.ProdName":"Microsoft SQL Server","HelpLink.ProdVer":"11.00.3128","HelpLink.EvtSrc":"MSSQLServer","HelpLink.EvtID":"547","HelpLink.BaseHelpUrl":"http://go.microsoft.com/fwlink","HelpLink.LinkId":"20476"},"InnerException":null,"HelpURL":null,"StackTraceString":"   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)'r'n   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)'r'n   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)'r'n   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()'r'n   at System.Data.SqlClient.SqlDataReader.get_MetaData()'r'n   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)'r'n   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds)'r'n   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)'r'n   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)'r'n   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)'r'n   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)'r'n   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<>c__DisplayClassb.<Reader>b__8()'r'n   at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TInterceptionContext,TResult](Func`1 operation, TInterceptionContext interceptionContext, Action`1 executing, Action`1 executed)'r'n   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext)'r'n   at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior)'r'n   at System.Data.Entity.Core.Mapping.Update.Internal.DynamicUpdateCommand.Execute(Dictionary`2 identifierValues, List`1 generatedValues)'r'n   at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update()","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":"8'nOnError'nSystem.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'nSystem.Data.SqlClient.SqlConnection'nVoid OnError(System.Data.SqlClient.SqlException, Boolean, System.Action`1[System.Action])","HResult":-2146232060,"Source":".Net SqlClient Data Provider","WatsonBuckets":null},"HelpURL":null,"StackTraceString":"   at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update()'r'n   at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.<Update>b__2(UpdateTranslator ut)'r'n   at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update[T](T noChangesResult, Func`2 updateFunction, Boolean throwOnClosedConnection)'r'n   at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update(Boolean throwOnClosedConnection)'r'n   at System.Data.Entity.Core.Objects.ObjectContext.<SaveChangesToStore>b__33()'r'n   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)'r'n   at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy)'r'n   at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass28.<SaveChanges>b__25()'r'n   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)'r'n   at System.Data.Entity.Core.Objects.ObjectContext.SaveChanges(SaveOptions options)'r'n   at System.Data.Entity.Internal.InternalContext.SaveChanges()","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":"8'nUpdate'nEntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'nSystem.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator'nInt32 Update()","HResult":-2146233087,"Source":"EntityFramework","WatsonBuckets":null},"HelpURL":null,"StackTraceString":"   at Sensoria.Models.ShoeClosetModel.CreateClosetModelForUser(Int32 userId, ShoeClosetItem newClosetItem) in c:''Users''maurgi''Source''Hg''sensoria-main''Source''Web''Sensoria.Models''ShoeClosetModel.cs:line 225'r'n   at Sensoria.Models.ShoeClosetModel.CreateClosetItem(Int32 userID, ShoeClosetItem newClosetItem) in c:''Users''maurgi''Source''Hg''sensoria-main''Source''Web''Sensoria.Models''ShoeClosetModel.cs:line 76'r'n   at Sensoria.Api.Controllers.ShoeClosetController.AddNewShoe(Int32 userId, ShoeClosetItem sItem) in c:''Users''maurgi''Source''Hg''sensoria-main''Source''Web''Sensoria.Api''Controllers''ShoeClosetController.cs:line 79","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":"8'nCreateClosetModelForUser'nSensoria.Models, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'nSensoria.Models.ShoeClosetModel'nSensoria.Models.ShoeClosetModel CreateClosetModelForUser(Int32, Sensoria.Api.Core.Models.ShoeClosetItem)","HResult":-2146233087,"Source":"Sensoria.Models","WatsonBuckets":null,"SafeSerializationManager":{"m_serializedStates":[{"<InvolvesIndependentAssociations>k__BackingField":false}]},"CLR_SafeSerializationManager_RealType":"System.Data.Entity.Infrastructure.DbUpdateException, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"},"ModelState":null}
泛型APIResult类定义: 
public class SensoriaApiResult<T>
{
    /// <summary>
    /// The 
    /// </summary>
    [DataMember]
    public HttpStatusCode StatusCode;
    [DataMember]
    public T APIResult;
    [DataMember]
    public HttpError HttpError;
    [DataMember]
    public Exception Exception;
    [DataMember]
    public ModelStateDictionary ModelState;
    ...

}

无法强制转换类型为'Newtonsoft.Json.Linq.JObject'键入'system

因为这个问题已经有2年的历史了，我非常怀疑我能对原始的发布者有任何帮助，但是对于任何搜索这个错误的人来说，这是由于许多实体数据框架异常没有实现序列化构造函数，而是依赖于SerializeObjectState事件(就像System.Net.Http一样)。HttpRequestException，它恰好是过去几个小时一直在给me fits的小bug)。JSON。NET不能正确处理这种情况，如本错误报告中所记录的那样。

关于HttpRequestException的序列化/反序列化，这个可怕的黑客为我修复了这个问题:

string myJson = JsonConvert.SerializeObject(myObject).Replace("'"SafeSerializationManager'":", "'"_SafeSerializationManager'":");

当我试图用HttpRequestException类型的内部异常描述一个异常(我序列化的)时，我遇到了这个问题。这个异常不能被反序列化，因为它没有GetObjectData的实现。

我的解决方案是在序列化之前删除HttpRequestException实例。

如果您观察返回的json，表示序列化的异常，有趣的部分在这里:

…"InnerException":{"错误":[{"源":"。. Net SqlClient Data Provider"，"number":547，"state":0，"errorClass":16，"server":"."，"message":" INSERT语句与外键约束"FK_UserBase.ClosetItems_Catalog.Products "冲突。冲突发生在数据库"Sensoria.Knowledge"中。数据库/表/目录。产品'",列"ProductId"。","过程":","lineNumber":1、"win32ErrorCode":0},{"源":"。. Net SqlClient Data Provider"，"number":3621，"state":0，"errorClass":0，"server":"."，"message":"The statement has been terminated."，"procedure":"，"lineNumber":1，"win32ErrorCode":0}]，"ClientConnectionId":"7b976c29- 59ff491c - a3aa01750e17cb36 "，"ClassName":"System.Data.SqlClient. Net "，"number":3621，"state":0，"errorClass":0，"server":"."SqlException"，"Message":" INSERT语句与外键约束"FK_UserBase.ClosetItems_Catalog.Products "冲突。冲突发生在数据库"Sensoria.Knowledge"中。数据库/表/目录。，列'ProductId'。'r'n语句已被终止"，"Data":{"ProdName":"Microsoft SQL…

也就是这个语句:

" INSERT语句与外键约束冲突 '"FK_UserBase.ClosetItems_Catalog.Products'"。冲突发生在数据库"Sensoria.Knowledge"中。数据库'"，表'"db . catalog。产品 '",列的ProductId * *

所以我建议观察你正在接收和传递的参数body的值:PostSensoriaApiResult(object body)。可能有一些ProductId不存在(通常0，即任何int属性的默认值)

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