不知怎的，我的实体数据上下文没有更新数据库.. 在.Net框架中，我做了以下内容：
像这里创建的实体模型：http://msdn.microsoft.com/en-us/library/bb399739(v=vs.90），其中table = entity名为“Level”。
在此模型的代码新上下文中添加：
Main_dataBaseEntities context;
//...
context = new Main_dataBaseEntities;
使用Path属性添加了“Level”实体的新对象：
var z = new Level {Path = "zPath"};
context.Level.AddObject(z);
保存更改：
context.SaveChanges();
数据库表没有显示任何内容..如何添加新项目？））
基于数据库的Entity框架创建的My Entity类如下：
//------------------------------------------------------------------------------
// <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<T> 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<T> 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<T> 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<T> 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<T> 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<T> 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<T> 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<T> 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<T> 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<T> 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<T> 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<T> 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<T> 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
答案 0 :(得分：2)
你试过吗？
context.Levels.Add(z);
context.SaveChanges();
如果这不起作用，请围绕上述操作包装一个异常处理程序，并捕获抛出的异常。
所以完整的代码将是：
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
}
}
您应该在生产代码中使用更具体的异常替换上面的Exception，但这样就足以查看导致问题的原因。
答案 1 :(得分：0)
savechanges方法返回处于已添加，已修改或已删除状态的对象数，尝试调试并查看返回值的内容以及是否抛出任何异常。我个人更喜欢数据库第一种方法。
int num = context.SaveChanges();