由于对象的当前状态,操作无效

Question

我正在使用ODP.NET 11.2.0.3.0的Entity Framework.我得到了持久性工作的一些表,但这一个平坦拒绝添加一个简单的新对象,我无法弄明白.非常感谢您的帮助.谢谢

这是代码.我通过模型浏览器从对象中删除了图像字段,并且在调用SaveChanges()时代码仍然失败.

var corpDirectoryEntities = new CorpDirectoryEntities();
var cc = new EmployeePhoto();
cc.UserId = 12345;   // NUMBER field
cc.ImageName = "imagename";   // VARCHAR2(100)
cc.Image = photoStream;   // LONG RAW
corpDirectoryEntities.EmployeePhotos.AddObject(cc);
corpDirectoryEntities.SaveChanges();

发生以下异常.

System.Data.UpdateException was unhandled by user code
  Message=An error occurred while updating the entries. See the inner exception for details.
  Source=System.Data.Entity
  StackTrace:
       at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
       at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache)
       at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
       at System.Data.Objects.ObjectContext.SaveChanges()
       at Repositories.Services.CorpDirectory.CorpDirectoryRepository.SaveDirectoryAccountPhoto(Int32 accountId, Byte[] photoStream) in C:\Dev\Projects\Repositories\Services\CorpDirectory\CorpDirectoryRepository.cs:line 356
       at Tests.CorpDirectory.CorpDirectoryUserTestFixture.TestGetUserPhoto() in C:\Dev\Projects\Repositories.Tests\CorpDirectory\CorpDirectoryUserTestFixture.cs:line 192
  InnerException: System.Data.EntityCommandCompilationException
       Message=An error occurred while preparing the command definition. See the inner exception for details.
       Source=System.Data.Entity
       StackTrace:
            at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree)
            at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.CreateCommand(UpdateTranslator translator, Dictionary`2 identifierValues)
            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)
       InnerException: System.InvalidOperationException
            Message=Operation is not valid due to the current state of the object.
            Source=Oracle.DataAccess
            StackTrace:
                 at Oracle.DataAccess.Client.SqlGen.DmlSqlGenerator.ExpressionTranslator.Visit(DbScanExpression expression)
                 at System.Data.Common.CommandTrees.DbScanExpression.Accept(DbExpressionVisitor visitor)
                 at Oracle.DataAccess.Client.SqlGen.DmlSqlGenerator.GenerateInsertSql(DbInsertCommandTree tree, EFOracleProviderManifest providerManifest, EFOracleVersion sqlVersion, List`1& parameters)
                 at Oracle.DataAccess.Client.SqlGen.SqlGenerator.GenerateSql(DbCommandTree tree, EFOracleProviderManifest providerManifest, EFOracleVersion sqlVersion, List`1& parameters, CommandType& commandType)
                 at Oracle.DataAccess.Client.EFOracleProviderServices.CreateCommand(EFOracleProviderManifest providerManifest, DbCommandTree commandTree)
                 at Oracle.DataAccess.Client.EFOracleProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree)
                 at System.Data.Common.DbProviderServices.CreateCommandDefinition(DbCommandTree commandTree)
                 at System.Data.Common.DbProviderServices.CreateCommand(DbCommandTree commandTree)
                 at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree)
            InnerException: 

Answer 1

所以,看了几个小时之后,我终于明白了.我检查了.ssdl文件.我的对象之间的一个区别在于如何<EntitySet ... >定义.我改变了它,当然,它现在有效.EF设计师真是太可怕了.

<EntitySet Name="EmployeePhoto" ... store:Name="TABLE_NAME">
    <DefiningQuery>
        SELECT ..... 
    </DefiningQuery>
</EntitySet>

我删除了<DefiningQuery...>并用以下内容替换它以匹配其他实体:

<EntitySet Name="EmployeePhoto" ... />