DBContext.Set< T>不包含Set< T>的定义. [英] DBContext.Set<T> does not contain definition of Set<T>

问题描述

我正在尝试实现

I am trying to implement an abstract repository pattern as described in THIS post. I'm getting the error message

'C'不包含'Set'的定义，也没有扩展方法 可以找到'Set'接受类型为'C'的第一个参数 缺少using指令或程序集引用?)

'C' does not contain a definition for 'Set' and no extension method 'Set' accepting a first argument of type 'C' could be found (are you missing a using directive or an assembly reference?)

其中C是DBContext

where C is the DBContext

namespace Rental.Data.Entity.Repository
{
   public abstract class GenericRepo<C, T> : 
       IGenericRepo<T> where T : class where C : RentalContainer, new()
   {
       private C _DBContext = new C();
       protected C DBContext
       {

           get { return _DBContext; }
           set { _DBContext = value; }
       }

       public virtual IQueryable<T> GetAll()
       {       

           IQueryable<T> query = _DBContext.Set<T>(); <-- here is gives the error
           return query;
       }

---

又一次更新

---

yet another update

public partial class RentalContainer : ObjectContext
    {
        #region Constructors

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

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

推荐答案

ObjectContext没有Set方法.它具有CreateObjectSet方法

ObjectContext does not have a Set method. It has CreateObjectSet method

   public abstract class GenericRepo<C, T> : IGenericRepo<T> 
     where T : class 
     where C : RentalContainer, new()
   {
       private C _DBContext = new C();
       protected C DBContext
       {

           get { return _DBContext; }
           set { _DBContext = value; }
       }

       public virtual IQueryable<T> GetAll()
       {       

           IQueryable<T> query = _DBContext.CreateObjectSet<T>();
           return query;
       }
   }

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