如何从EF DbUpdateException获取一些其他信息

debugcn 发表于 Dev

艾伦2

我正在使用Entity Framework 5并进行更新。我收到以下异常，并且使用SQL事件探查器没有看到发出的任何SQL：

    catch (DbUpdateException ex)
    {
        return Request.CreateErrorResponse(HttpStatusCode.Conflict, ex);
    }

带有这样的消息：

{System.Data.Entity.Infrastructure.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.UpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_QuestionQuestionStatus". The conflict occurred in database "TestDb", table "dbo.QuestionStatus", column 'QuestionStatusId'.
The statement has been terminated.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues)
   at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
   --- End of inner exception stack trace ---
   at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
   at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
   at System.Data.Entity.Internal.InternalContext.SaveChanges()
   --- End of inner exception stack trace ---
   at System.Data.Entity.Internal.InternalContext.SaveChanges()
   at System.Data.Entity.Internal.LazyInternalContext.SaveChanges()
   at System.Data.Entity.DbContext.SaveChanges()
   at TestDb.Models.Contexts.TestDbContext.SaveChanges() in c:\K\ST134 Aug 14\TestDb.Models\Contexts\TestDbContext.cs:line 101
   at TestDb.Services.TestDbUowBase.Commit() in c:\K\ST135 Aug 15\TestDb.Services\TestDbUowBase.cs:line 48
   at TestDb.Web.Controllers.ProblemController.PostProblem(Problem problem) in c:\K\ST135 Aug 15\WebUx\Controllers\ProblemController.cs:line 99}

通常，我可以找到有关异常的线索，但是在这种情况下，在异常列表中看不到任何有用的信息。有人对我如何找到更多建议吗？

克里斯·维耶特

消息：

The INSERT statement conflicted with the FOREIGN KEY constraint "FK_QuestionQuestionStatus". The conflict occurred in database "TestDb", table "dbo.QuestionStatus", column 'QuestionStatusId'.

听起来很准确，我认为。检查您的实体是否已将所有（必需）外键都设置为有效值。

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