开始一个新的mvc4项目。使用MVC控制器模板创建'Orders'模型的读/写操作。添加了一个新的Entity框架连接到我的数据库，并尝试使用新订单更新它。
[HttpPost]
public ActionResult Create(Orders orders)
{
try
{
//type used in a using statement must be implicity convertible to system.Idisposable
using (BuyABicycleEntities db = new BuyABicycleEntities())
{
Order NewOrder = new Order();
NewOrder.BicycleColour = orders.BicycleColour;
NewOrder.BicycleModel = orders.BicycleModel;
NewOrder.BicycleSize = orders.BicycleSize;
NewOrder.CustomerAddress = orders.CustomerAddress;
NewOrder.CustomerEmail = orders.CustomerEmail;
NewOrder.CustomerName = orders.CustomerName;
NewOrder.CustomerPhoneNumber = orders.CustomerPhoneNumber;
//entiry framework new item
//db.Orders.(NewOrder);
db.SaveChanges();
}
return View(orders);
}
catch (Exception ex)
{
//Show Message("Error in Orders - " + ex.Message);
}
}
但是using语句正在标记错误：
在using语句中使用的类型必须是implicity可转换为 System.IDisposable的
所以我必须实现idisposable ?,每次我想更新数据库时都必须这样做吗？通过stackoverflow搜索了很多类似的Q但仍然不确定如何处理我的？请指教。感谢
// ------------------------------------------------------------------------------
// DO NOT MODIFY THIS CLASS - AutoGenerated Code
// Any changes made to this code will be lost the next time this
// code is regenerated.
//
// Generated at: 05/08/2014 14:16:31
// DevForce version: 6.1.7.0
// Template version: 2.1.4
// ------------------------------------------------------------------------------
using System;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Runtime.Serialization;
using IbEm = IdeaBlade.EntityModel;
using IbCore = IdeaBlade.Core;
using IbVal = IdeaBlade.Validation;
[module: IbCore.IdeaBladeLicense("5w+U/Qneh0KYrGDaCOhKKqJpzM0BhW5i7ky77IZpGawLem2DQ5JuP6W8fhhcpF/x")]
namespace MvcApplication18 {
#region BuyABicycleEntities
/// <summary>
/// The domain-specific EntityManager for your domain model.
/// </summary>
public partial class BuyABicycleEntities : IbEm.EntityManager {
#region Constructors
/// <summary>See <see cref="M:IbEm.EntityManager.#ctor(bool, string, IbEm.EntityServiceOption, string)"/>. </summary>
public BuyABicycleEntities(bool shouldConnect=true, string dataSourceExtension=null, IbEm.EntityServiceOption entityServiceOption=IbEm.EntityServiceOption.UseDefaultService, string compositionContextName=null) : base(shouldConnect, dataSourceExtension, entityServiceOption, compositionContextName) {}
/// <summary>See <see cref="M:IbEm.EntityManager.#ctor(IbEm.EntityManagerContext)"/>. </summary>
public BuyABicycleEntities(IbEm.EntityManagerContext entityManagerContext) : base(entityManagerContext) {}
/// <summary>See <see cref="M:IbEm.EntityManager.#ctor(IbEm.EntityManager, bool, string, IbEm.EntityServiceOption, string)"/>. </summary>
public BuyABicycleEntities(IbEm.EntityManager entityManager, bool shouldConnect, string dataSourceExtension=null, IbEm.EntityServiceOption entityServiceOption=IbEm.EntityServiceOption.UseDefaultService, string compositionContextName=null) : base(entityManager, shouldConnect, dataSourceExtension, entityServiceOption, compositionContextName) {}
/// <summary>See <see cref="M:IbEm.EntityManager.#ctor(IbEm.EntityManager, IbEm.EntityManagerContext)"/>. </summary>
public BuyABicycleEntities(IbEm.EntityManager entityManager, IbEm.EntityManagerContext entityManagerContext=null) : base(entityManager, entityManagerContext) {}
static BuyABicycleEntities() {
IbEm.EntityRelation.InitializeEntityRelations(System.Reflection.Assembly.GetExecutingAssembly());
}
#endregion Constructors
#region EntityQueries
/// <summary>Gets the <see cref="T:IbEm.EntityQuery"/> associated with the given EntitySet name. </summary>
public IbEm.EntityQuery<BicycleModel> BicycleModels {
get { return new IbEm.EntityQuery<BicycleModel>("BicycleModels", this); }
}
/// <summary>Gets the <see cref="T:IbEm.EntityQuery"/> associated with the given EntitySet name. </summary>
public IbEm.EntityQuery<Customer> Customers {
get { return new IbEm.EntityQuery<Customer>("Customers", this); }
}
/// <summary>Gets the <see cref="T:IbEm.EntityQuery"/> associated with the given EntitySet name. </summary>
public IbEm.EntityQuery<Order> Orders {
get { return new IbEm.EntityQuery<Order>("Orders", this); }
}
#endregion EntityQueries
}
#endregion BuyABicycleEntities
#region BicycleModel class
/// <summary>The auto-generated BicycleModel class. </summary>
[DataContract(IsReference=true)]
[IbEm.DataSourceKeyName(@"BuyABicycleEntities")]
[IbEm.DefaultEntitySetName(@"BuyABicycleEntities.BicycleModels")]
public partial class BicycleModel : IbEm.Entity {
/// <summary>Returns the property path for the given expression. </summary>
/// <example>
/// Usage:
/// <code>
/// var r = Employee.PathFor(e => e.Manager.City); // returns "Manager.City"
/// </code>
/// </example>
public static string PathFor(System.Linq.Expressions.Expression<System.Func<BicycleModel, object>> expr) {
return IbCore.PropertyPath.For<BicycleModel>(expr);
}
#region Data Properties
/// <summary>Gets or sets the Id. </summary>
[Key]
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="Id", AutoGenerateField=true)]
[IbVal.RequiredValueVerifier( ErrorMessageResourceName="BicycleModel_Id")]
public int Id {
get { return PropertyMetadata.Id.GetValue(this); }
set { PropertyMetadata.Id.SetValue(this, value); }
}
/// <summary>Gets or sets the ModelName. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="ModelName", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="BicycleModel_ModelName")]
public string ModelName {
get { return PropertyMetadata.ModelName.GetValue(this); }
set { PropertyMetadata.ModelName.SetValue(this, value); }
}
#endregion Data Properties
#region Navigation properties
#endregion Navigation properties
#region EntityProperty definitions
public partial class PropertyMetadata {
/// Explicit static constructor ensures static fields are initialized.
static PropertyMetadata() {}
/// <summary>The Id <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<BicycleModel, int> Id = new IbEm.DataEntityProperty<BicycleModel, int>("Id", false, true, IbEm.ConcurrencyStrategy.None, true, null);
/// <summary>The ModelName <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<BicycleModel, string> ModelName = new IbEm.DataEntityProperty<BicycleModel, string>("ModelName", false, false, IbEm.ConcurrencyStrategy.None, false, null);
}
#endregion EntityProperty definitions
#region EntityPropertyNames
public new partial class EntityPropertyNames : IbEm.Entity.EntityPropertyNames {
public const String Id = "Id";
public const String ModelName = "ModelName";
}
#endregion EntityPropertyNames
}
#endregion BicycleModel class
#region Customer class
/// <summary>The auto-generated Customer class. </summary>
[DataContract(IsReference=true)]
[IbEm.DataSourceKeyName(@"BuyABicycleEntities")]
[IbEm.DefaultEntitySetName(@"BuyABicycleEntities.Customers")]
public partial class Customer : IbEm.Entity {
/// <summary>Returns the property path for the given expression. </summary>
/// <example>
/// Usage:
/// <code>
/// var r = Employee.PathFor(e => e.Manager.City); // returns "Manager.City"
/// </code>
/// </example>
public static string PathFor(System.Linq.Expressions.Expression<System.Func<Customer, object>> expr) {
return IbCore.PropertyPath.For<Customer>(expr);
}
#region Data Properties
/// <summary>Gets or sets the Id. </summary>
[Key]
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="Id", AutoGenerateField=true)]
[IbVal.RequiredValueVerifier( ErrorMessageResourceName="Customer_Id")]
public int Id {
get { return PropertyMetadata.Id.GetValue(this); }
set { PropertyMetadata.Id.SetValue(this, value); }
}
/// <summary>Gets or sets the CustomerName. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="CustomerName", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="Customer_CustomerName")]
public string CustomerName {
get { return PropertyMetadata.CustomerName.GetValue(this); }
set { PropertyMetadata.CustomerName.SetValue(this, value); }
}
#endregion Data Properties
#region Navigation properties
#endregion Navigation properties
#region EntityProperty definitions
public partial class PropertyMetadata {
/// Explicit static constructor ensures static fields are initialized.
static PropertyMetadata() {}
/// <summary>The Id <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Customer, int> Id = new IbEm.DataEntityProperty<Customer, int>("Id", false, true, IbEm.ConcurrencyStrategy.None, true, null);
/// <summary>The CustomerName <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Customer, string> CustomerName = new IbEm.DataEntityProperty<Customer, string>("CustomerName", false, false, IbEm.ConcurrencyStrategy.None, false, null);
}
#endregion EntityProperty definitions
#region EntityPropertyNames
public new partial class EntityPropertyNames : IbEm.Entity.EntityPropertyNames {
public const String Id = "Id";
public const String CustomerName = "CustomerName";
}
#endregion EntityPropertyNames
}
#endregion Customer class
#region Order class
/// <summary>The auto-generated Order class. </summary>
[DataContract(IsReference=true)]
[IbEm.DataSourceKeyName(@"BuyABicycleEntities")]
[IbEm.DefaultEntitySetName(@"BuyABicycleEntities.Orders")]
public partial class Order : IbEm.Entity {
/// <summary>Returns the property path for the given expression. </summary>
/// <example>
/// Usage:
/// <code>
/// var r = Employee.PathFor(e => e.Manager.City); // returns "Manager.City"
/// </code>
/// </example>
public static string PathFor(System.Linq.Expressions.Expression<System.Func<Order, object>> expr) {
return IbCore.PropertyPath.For<Order>(expr);
}
#region Data Properties
/// <summary>Gets or sets the Id. </summary>
[Key]
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="Id", AutoGenerateField=true)]
[IbVal.RequiredValueVerifier( ErrorMessageResourceName="Order_Id")]
public int Id {
get { return PropertyMetadata.Id.GetValue(this); }
set { PropertyMetadata.Id.SetValue(this, value); }
}
/// <summary>Gets or sets the CustomerName. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="CustomerName", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="Order_CustomerName")]
public string CustomerName {
get { return PropertyMetadata.CustomerName.GetValue(this); }
set { PropertyMetadata.CustomerName.SetValue(this, value); }
}
/// <summary>Gets or sets the CustomerAddress. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="CustomerAddress", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="Order_CustomerAddress")]
public string CustomerAddress {
get { return PropertyMetadata.CustomerAddress.GetValue(this); }
set { PropertyMetadata.CustomerAddress.SetValue(this, value); }
}
/// <summary>Gets or sets the CustomerPhoneNumber. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="CustomerPhoneNumber", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="Order_CustomerPhoneNumber")]
public string CustomerPhoneNumber {
get { return PropertyMetadata.CustomerPhoneNumber.GetValue(this); }
set { PropertyMetadata.CustomerPhoneNumber.SetValue(this, value); }
}
/// <summary>Gets or sets the CustomerEmail. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="CustomerEmail", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="Order_CustomerEmail")]
public string CustomerEmail {
get { return PropertyMetadata.CustomerEmail.GetValue(this); }
set { PropertyMetadata.CustomerEmail.SetValue(this, value); }
}
/// <summary>Gets or sets the BicycleModel. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="BicycleModel", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="Order_BicycleModel")]
public string BicycleModel {
get { return PropertyMetadata.BicycleModel.GetValue(this); }
set { PropertyMetadata.BicycleModel.SetValue(this, value); }
}
/// <summary>Gets or sets the BicycleSize. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="BicycleSize", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="Order_BicycleSize")]
public string BicycleSize {
get { return PropertyMetadata.BicycleSize.GetValue(this); }
set { PropertyMetadata.BicycleSize.SetValue(this, value); }
}
/// <summary>Gets or sets the BicycleColour. </summary>
[DataMember]
[Bindable(true, BindingDirection.TwoWay)]
[Editable(true)]
[Display(Name="BicycleColour", AutoGenerateField=true)]
[IbVal.StringLengthVerifier(MaxValue=50, IsRequired=true, ErrorMessageResourceName="Order_BicycleColour")]
public string BicycleColour {
get { return PropertyMetadata.BicycleColour.GetValue(this); }
set { PropertyMetadata.BicycleColour.SetValue(this, value); }
}
#endregion Data Properties
#region Navigation properties
#endregion Navigation properties
#region EntityProperty definitions
public partial class PropertyMetadata {
/// Explicit static constructor ensures static fields are initialized.
static PropertyMetadata() {}
/// <summary>The Id <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Order, int> Id = new IbEm.DataEntityProperty<Order, int>("Id", false, true, IbEm.ConcurrencyStrategy.None, true, null);
/// <summary>The CustomerName <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Order, string> CustomerName = new IbEm.DataEntityProperty<Order, string>("CustomerName", false, false, IbEm.ConcurrencyStrategy.None, false, null);
/// <summary>The CustomerAddress <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Order, string> CustomerAddress = new IbEm.DataEntityProperty<Order, string>("CustomerAddress", false, false, IbEm.ConcurrencyStrategy.None, false, null);
/// <summary>The CustomerPhoneNumber <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Order, string> CustomerPhoneNumber = new IbEm.DataEntityProperty<Order, string>("CustomerPhoneNumber", false, false, IbEm.ConcurrencyStrategy.None, false, null);
/// <summary>The CustomerEmail <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Order, string> CustomerEmail = new IbEm.DataEntityProperty<Order, string>("CustomerEmail", false, false, IbEm.ConcurrencyStrategy.None, false, null);
/// <summary>The BicycleModel <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Order, string> BicycleModel = new IbEm.DataEntityProperty<Order, string>("BicycleModel", false, false, IbEm.ConcurrencyStrategy.None, false, null);
/// <summary>The BicycleSize <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Order, string> BicycleSize = new IbEm.DataEntityProperty<Order, string>("BicycleSize", false, false, IbEm.ConcurrencyStrategy.None, false, null);
/// <summary>The BicycleColour <see cref="T:IbEm.DataEntityProperty"/>. </summary>
public static readonly IbEm.DataEntityProperty<Order, string> BicycleColour = new IbEm.DataEntityProperty<Order, string>("BicycleColour", false, false, IbEm.ConcurrencyStrategy.None, false, null);
}
#endregion EntityProperty definitions
#region EntityPropertyNames
public new partial class EntityPropertyNames : IbEm.Entity.EntityPropertyNames {
public const String Id = "Id";
public const String CustomerName = "CustomerName";
public const String CustomerAddress = "CustomerAddress";
public const String CustomerPhoneNumber = "CustomerPhoneNumber";
public const String CustomerEmail = "CustomerEmail";
public const String BicycleModel = "BicycleModel";
public const String BicycleSize = "BicycleSize";
public const String BicycleColour = "BicycleColour";
}
#endregion EntityPropertyNames
}
#endregion Order class
#region EntityRelations
/// <summary>
/// A generated class that returns the relations between entities in this model.
/// </summary>
[IbCore.IdeaBladeGuid("ada4f853-5b03-423a-a51f-0da38018c087", "2.1.4")]
public partial class EntityRelations : IbEm.IEntityRelations {
/// Explicit static constructor ensures static fields are initialized.
static EntityRelations() {}
}
#endregion EntityRelations
}
答案 0 :(得分：4)
错误说BuyABicycleEntities应该从IDisposable接口继承。看起来您正在使用实体框架，因此数据库上下文应该已经继承它，所以请检查您是否正在使用实体框架。
详情请见此处 - Working with DbContext
如果使用IdeaBlade EntityManager
，则无需将代码包装使用答案 1 :(得分：-1)
现在添加一个方法来在BuyABicycleEntities类
上实现IDisposablevoid IDisposable.Dispose(){
}