Entity контекст не обновляет базы данных

Question

Как-то мой контекст данных объекта не обновляется база данных .. В рамках .Net я сделал следующее:

1. создал модель объекта, как здесь: http://msdn.microsoft.com/en-us/library/bb399739(v=vs.90) с таблицей = объектом названный «Уровень».

2. Добавлен в коде нового контекста для этой модели:

   Main_dataBaseEntities context; 
   //... 
   context = new Main_dataBaseEntities; 
   

3. Добавлен новый объект "Уровень" лица с пути свойства:

   var z = new Level {Path = "zPath"}; 
   context.Level.AddObject(z); 
   

4. Сохраненные изменения:

   context.SaveChanges(); 
   

Базы данных таблицы ничего не показывает .. Как я могу добавить новый элемент))

Мой Entity класс, созданный рамках Entity на основе базы данных выглядит следующим образом:

//------------------------------------------------------------------------------ 
// <auto-generated> 
// This code was generated from a template. 
// 
// Manual changes to this file may cause unexpected behavior in your application. 
// Manual changes to this file will be overwritten if the code is regenerated. 
// </auto-generated> 
//------------------------------------------------------------------------------ 

using System; 
using System.Data.Objects; 
using System.Data.Objects.DataClasses; 
using System.Data.EntityClient; 
using System.ComponentModel; 
using System.Xml.Serialization; 
using System.Runtime.Serialization; 

[assembly: EdmSchemaAttribute()] 
#region EDM Relationship Metadata 

[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Terminals_Brokers", "Broker", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Broker), "Terminal", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Terminal), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Clients_Terminals", "Terminal", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Terminal), "Client", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Client), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_ClientsTickers_Clients", "Client", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Client), "ClientTicker", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.ClientTicker), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Risks_Clients", "Client", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Client), "Risk", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Risk), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_ClientsTickers_Tickers", "Ticker", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Ticker), "ClientTicker", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.ClientTicker), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Tickers_Currencies", "Currency", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Currency), "Ticker", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Ticker), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Levels_Strategies", "Strategy", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Strategy), "Level", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Level), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Levels_Tickers", "Ticker", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Ticker), "Level", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Level), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Transactions_Levels", "Level", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Level), "Transaction", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Transaction), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Risks_Strategies", "Strategy", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Strategy), "Risk", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Risk), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Risks_Tickers", "Ticker", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Ticker), "Risk", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Risk), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Transaction_Risk", "Risk", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Risk), "Transaction", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Transaction), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Transactions_Statuses", "Status", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.Status), "Transaction", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Transaction), true)] 
[assembly: EdmRelationshipAttribute("Main_dataBaseModel", "FK_Terminals_TerminalTypes", "TerminalType", System.Data.Metadata.Edm.RelationshipMultiplicity.ZeroOrOne, typeof(trust_manager_v_1._0.TerminalType), "Terminal", System.Data.Metadata.Edm.RelationshipMultiplicity.Many, typeof(trust_manager_v_1._0.Terminal), true)] 

#endregion 

namespace trust_manager_v_1._0 
{ 
    #region Contexts 

    /// <summary> 
    /// No Metadata Documentation available. 
    /// </summary> 
    public partial class Main_dataBaseEntities : ObjectContext 
    { 
     #region Constructors 

     /// <summary> 
     /// Initializes a new Main_dataBaseEntities object using the connection string found in the 'Main_dataBaseEntities' section of the application configuration file. 
     /// </summary> 
     public Main_dataBaseEntities() : base("name=Main_dataBaseEntities", "Main_dataBaseEntities") 
     { 
      this.ContextOptions.LazyLoadingEnabled = true; 
      OnContextCreated(); 
     } 

     /// <summary> 
     /// Initialize a new Main_dataBaseEntities object. 
     /// </summary> 
     public Main_dataBaseEntities(string connectionString) : base(connectionString, "Main_dataBaseEntities") 
     { 
      this.ContextOptions.LazyLoadingEnabled = true; 
      OnContextCreated(); 
     } 

     /// <summary> 
     /// Initialize a new Main_dataBaseEntities object. 
     /// </summary> 
     public Main_dataBaseEntities(EntityConnection connection) : base(connection, "Main_dataBaseEntities") 
     { 
      this.ContextOptions.LazyLoadingEnabled = true; 
      OnContextCreated(); 
     } 

     #endregion 

     #region Partial Methods 

     partial void OnContextCreated(); 

     #endregion 

     #region ObjectSet Properties 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Broker> Broker 
     { 
      get 
      { 
       if ((_Broker == null)) 
       { 
        _Broker = base.CreateObjectSet<Broker>("Broker"); 
       } 
       return _Broker; 
      } 
     } 
     private ObjectSet<Broker> _Broker; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Client> Client 
     { 
      get 
      { 
       if ((_Client == null)) 
       { 
        _Client = base.CreateObjectSet<Client>("Client"); 
       } 
       return _Client; 
      } 
     } 
     private ObjectSet<Client> _Client; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<ClientTicker> ClientTicker 
     { 
      get 
      { 
       if ((_ClientTicker == null)) 
       { 
        _ClientTicker = base.CreateObjectSet<ClientTicker>("ClientTicker"); 
       } 
       return _ClientTicker; 
      } 
     } 
     private ObjectSet<ClientTicker> _ClientTicker; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Currency> Currency 
     { 
      get 
      { 
       if ((_Currency == null)) 
       { 
        _Currency = base.CreateObjectSet<Currency>("Currency"); 
       } 
       return _Currency; 
      } 
     } 
     private ObjectSet<Currency> _Currency; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Level> Level 
     { 
      get 
      { 
       if ((_Level == null)) 
       { 
        _Level = base.CreateObjectSet<Level>("Level"); 
       } 
       return _Level; 
      } 
     } 
     private ObjectSet<Level> _Level; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Risk> Risk 
     { 
      get 
      { 
       if ((_Risk == null)) 
       { 
        _Risk = base.CreateObjectSet<Risk>("Risk"); 
       } 
       return _Risk; 
      } 
     } 
     private ObjectSet<Risk> _Risk; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Status> Status 
     { 
      get 
      { 
       if ((_Status == null)) 
       { 
        _Status = base.CreateObjectSet<Status>("Status"); 
       } 
       return _Status; 
      } 
     } 
     private ObjectSet<Status> _Status; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Strategy> Strategy 
     { 
      get 
      { 
       if ((_Strategy == null)) 
       { 
        _Strategy = base.CreateObjectSet<Strategy>("Strategy"); 
       } 
       return _Strategy; 
      } 
     } 
     private ObjectSet<Strategy> _Strategy; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<sysdiagrams> sysdiagrams 
     { 
      get 
      { 
       if ((_sysdiagrams == null)) 
       { 
        _sysdiagrams = base.CreateObjectSet<sysdiagrams>("sysdiagrams"); 
       } 
       return _sysdiagrams; 
      } 
     } 
     private ObjectSet<sysdiagrams> _sysdiagrams; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Terminal> Terminal 
     { 
      get 
      { 
       if ((_Terminal == null)) 
       { 
        _Terminal = base.CreateObjectSet<Terminal>("Terminal"); 
       } 
       return _Terminal; 
      } 
     } 
     private ObjectSet<Terminal> _Terminal; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<TerminalType> TerminalType 
     { 
      get 
      { 
       if ((_TerminalType == null)) 
       { 
        _TerminalType = base.CreateObjectSet<TerminalType>("TerminalType"); 
       } 
       return _TerminalType; 
      } 
     } 
     private ObjectSet<TerminalType> _TerminalType; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Ticker> Ticker 
     { 
      get 
      { 
       if ((_Ticker == null)) 
       { 
        _Ticker = base.CreateObjectSet<Ticker>("Ticker"); 
       } 
       return _Ticker; 
      } 
     } 
     private ObjectSet<Ticker> _Ticker; 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     public ObjectSet<Transaction> Transaction 
     { 
      get 
      { 
       if ((_Transaction == null)) 
       { 
        _Transaction = base.CreateObjectSet<Transaction>("Transaction"); 
       } 
       return _Transaction; 
      } 
     } 
     private ObjectSet<Transaction> _Transaction; 

     #endregion 
     #region AddTo Methods 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Broker EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToBroker(Broker broker) 
     { 
      base.AddObject("Broker", broker); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Client EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToClient(Client client) 
     { 
      base.AddObject("Client", client); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the ClientTicker EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToClientTicker(ClientTicker clientTicker) 
     { 
      base.AddObject("ClientTicker", clientTicker); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Currency EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToCurrency(Currency currency) 
     { 
      base.AddObject("Currency", currency); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Level EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToLevel(Level level) 
     { 
      base.AddObject("Level", level); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Risk EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToRisk(Risk risk) 
     { 
      base.AddObject("Risk", risk); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Status EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToStatus(Status status) 
     { 
      base.AddObject("Status", status); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Strategy EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToStrategy(Strategy strategy) 
     { 
      base.AddObject("Strategy", strategy); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the sysdiagrams EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddTosysdiagrams(sysdiagrams sysdiagrams) 
     { 
      base.AddObject("sysdiagrams", sysdiagrams); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Terminal EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToTerminal(Terminal terminal) 
     { 
      base.AddObject("Terminal", terminal); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the TerminalType EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToTerminalType(TerminalType terminalType) 
     { 
      base.AddObject("TerminalType", terminalType); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Ticker EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToTicker(Ticker ticker) 
     { 
      base.AddObject("Ticker", ticker); 
     } 

     /// <summary> 
     /// Deprecated Method for adding a new object to the Transaction EntitySet. Consider using the .Add method of the associated ObjectSet&lt;T&gt; property instead. 
     /// </summary> 
     public void AddToTransaction(Transaction transaction) 
     { 
      base.AddObject("Transaction", transaction); 
     } 

     #endregion 
    } 


    #endregion 

    #region Entities 

    /// <summary> 
    /// No Metadata Documentation available. 
    /// </summary> 
    [EdmEntityTypeAttribute(NamespaceName="Main_dataBaseModel", Name="Broker")] 
    [Serializable()] 
    [DataContractAttribute(IsReference=true)] 
    public partial class Broker : EntityObject 
    { 
     #region Factory Method 

     /// <summary> 
     /// Create a new Broker object. 
     /// </summary> 
     /// <param name="id">Initial value of the ID property.</param> 
     public static Broker CreateBroker(global::System.Guid id) 
     { 
      Broker broker = new Broker(); 
      broker.ID = id; 
      return broker; 
     } 

     #endregion 
     #region Primitive Properties 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)] 
     [DataMemberAttribute()] 
     public global::System.Guid ID 
     { 
      get 
      { 
       return _ID; 
      } 
      set 
      { 
       if (_ID != value) 
       { 
        OnIDChanging(value); 
        ReportPropertyChanging("ID"); 
        _ID = StructuralObject.SetValidValue(value); 
        ReportPropertyChanged("ID"); 
        OnIDChanged(); 
       } 
      } 
     } 
     private global::System.Guid _ID; 
     partial void OnIDChanging(global::System.Guid value); 
     partial void OnIDChanged(); 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)] 
     [DataMemberAttribute()] 
     public global::System.String Name 
     { 
      get 
      { 
       return _Name; 
      } 
      set 
      { 
       OnNameChanging(value); 
       ReportPropertyChanging("Name"); 
       _Name = StructuralObject.SetValidValue(value, true); 
       ReportPropertyChanged("Name"); 
       OnNameChanged(); 
      } 
     } 
     private global::System.String _Name; 
     partial void OnNameChanging(global::System.String value); 
     partial void OnNameChanged(); 

     #endregion 

     #region Navigation Properties 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [XmlIgnoreAttribute()] 
     [SoapIgnoreAttribute()] 
     [DataMemberAttribute()] 
     [EdmRelationshipNavigationPropertyAttribute("Main_dataBaseModel", "FK_Terminals_Brokers", "Terminal")] 
     public EntityCollection<Terminal> Terminal 
     { 
      get 
      { 
       return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedCollection<Terminal>("Main_dataBaseModel.FK_Terminals_Brokers", "Terminal"); 
      } 
      set 
      { 
       if ((value != null)) 
       { 
        ((IEntityWithRelationships)this).RelationshipManager.InitializeRelatedCollection<Terminal>("Main_dataBaseModel.FK_Terminals_Brokers", "Terminal", value); 
       } 
      } 
     } 

     #endregion 
    } 

    /// <summary> 
    /// No Metadata Documentation available. 
    /// </summary> 
    [EdmEntityTypeAttribute(NamespaceName="Main_dataBaseModel", Name="Client")] 
    [Serializable()] 
    [DataContractAttribute(IsReference=true)] 
    public partial class Client : EntityObject 
    { 
     #region Factory Method 

     /// <summary> 
     /// Create a new Client object. 
     /// </summary> 
     /// <param name="id">Initial value of the ID property.</param> 
     public static Client CreateClient(global::System.Guid id) 
     { 
      Client client = new Client(); 
      client.ID = id; 
      return client; 
     } 

     #endregion 
     #region Primitive Properties 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)] 
     [DataMemberAttribute()] 
     public global::System.Guid ID 
     { 
      get 
      { 
       return _ID; 
      } 
      set 
      { 
       if (_ID != value) 
       { 
        OnIDChanging(value); 
        ReportPropertyChanging("ID"); 
        _ID = StructuralObject.SetValidValue(value); 
        ReportPropertyChanged("ID"); 
        OnIDChanged(); 
       } 
      } 
     } 
     private global::System.Guid _ID; 
     partial void OnIDChanging(global::System.Guid value); 
     partial void OnIDChanged(); 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)] 
     [DataMemberAttribute()] 
     public global::System.String Name 
     { 
      get 
      { 
       return _Name; 
      } 
      set 
      { 
       OnNameChanging(value); 
       ReportPropertyChanging("Name"); 
       _Name = StructuralObject.SetValidValue(value, true); 
       ReportPropertyChanged("Name"); 
       OnNameChanged(); 
      } 
     } 
     private global::System.String _Name; 
     partial void OnNameChanging(global::System.String value); 
     partial void OnNameChanged(); 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)] 
     [DataMemberAttribute()] 
     public global::System.String Account 
     { 
      get 
      { 
       return _Account; 
      } 
      set 
      { 
       OnAccountChanging(value); 
       ReportPropertyChanging("Account"); 
       _Account = StructuralObject.SetValidValue(value, true); 
       ReportPropertyChanged("Account"); 
       OnAccountChanged(); 
      } 
     } 
     private global::System.String _Account; 
     partial void OnAccountChanging(global::System.String value); 
     partial void OnAccountChanged(); 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)] 
     [DataMemberAttribute()] 
     public global::System.String Comment 
     { 
      get 
      { 
       return _Comment; 
      } 
      set 
      { 
       OnCommentChanging(value); 
       ReportPropertyChanging("Comment"); 
       _Comment = StructuralObject.SetValidValue(value, true); 
       ReportPropertyChanged("Comment"); 
       OnCommentChanged(); 
      } 
     } 
     private global::System.String _Comment; 
     partial void OnCommentChanging(global::System.String value); 
     partial void OnCommentChanged(); 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)] 
     [DataMemberAttribute()] 
     public Nullable<global::System.Single> Assets 
     { 
      get 
      { 
       return _Assets; 
      } 
      set 
      { 
       OnAssetsChanging(value); 
       ReportPropertyChanging("Assets"); 
       _Assets = StructuralObject.SetValidValue(value); 
       ReportPropertyChanged("Assets"); 
       OnAssetsChanged(); 
      } 
     } 
     private Nullable<global::System.Single> _Assets; 
     partial void OnAssetsChanging(Nullable<global::System.Single> value); 
     partial void OnAssetsChanged(); 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)] 
     [DataMemberAttribute()] 
     public global::System.String Virtual_Assets 
     { 
      get 
      { 
       return _Virtual_Assets; 
      } 
      set 
      { 
       OnVirtual_AssetsChanging(value); 
       ReportPropertyChanging("Virtual_Assets"); 
       _Virtual_Assets = StructuralObject.SetValidValue(value, true); 
       ReportPropertyChanged("Virtual_Assets"); 
       OnVirtual_AssetsChanged(); 
      } 
     } 
     private global::System.String _Virtual_Assets; 
     partial void OnVirtual_AssetsChanging(global::System.String value); 
     partial void OnVirtual_AssetsChanged(); 

     /// <summary> 
     /// No Metadata Documentation available. 
     /// </summary> 
     [EdmScalarPropertyAttri 

Answer 1

Вы пробовали?

context.Levels.Add(z); 
context.SaveChanges(); 

Если это не сработает, заверните обработчик исключений вокруг вышеупомянутых операций и поймайте, какие исключения выбрасываются.

Так полный код будет:

using(var context = new Main_dataBaseEntities()) 
{ 
    try 
    { 
     var z = new Level {Path = "zPath"}; 
     context.Levels.Add(z); 
     context.SaveChanges(); 
    } 
    catch(Exception ex) 
    { 
     //View or handle exception here 
    }  
} 

Вы должны заменить Exception выше с более конкретным исключением производства кода, но это будет достаточно, чтобы увидеть, что является причиной проблемы.

Answer 2

Метод savechanges methode возвращает количество объектов в добавленном, измененном или удаленном состоянии, пытается отлаживать и видеть, что вы получаете как возвращаемое значение, и если какие-либо исключения выбрасываются. Лично я предпочитаю первый подход к базе данных.

int num = context.SaveChanges();