我正在努力解決上述錯誤。我在這裏發現了不同的答案(堆棧溢出),但沒有一個能夠解決與錯誤有關的問題。實體框架已經有一個打開的DataReader與這個命令相關聯,必須先關閉
我只是在我的ConnectionString中啓用MARS,但沒有成功。
我有一類產品
public class Product
{
public Product()
{
this.Additives = new HashSet<Additive>();
}
public int Id { get; set; }
public string Name { get; set; } // refrigerante
public string CommercialName { get; set; } // nome popular, ex: fanta laranja
public string Brand { get; set; } // marca, ex: Coca-cola
public string Details { get; set; } // composicao, ingredientes
public HalalState HalalState { get; set; } // estado: halal, haram ou desconhecido
public DateTime? LastUpdate { get; set; } // date e hora do registo
public virtual ICollection<Additive> Additives { get; set; } // aditivos
public int ProviderID { get; set; }
}
}
和類添加劑在產品中佔添加劑
using System;
using System.Collections.Generic;
namespace Teknowhow.EatHalal.Core.Models
{
public class Additive
{
public Additive()
{
this.Products = new HashSet<Product>();
}
public int Id { get; set; }
public string Key { get; set; } // codigo ex: E130
public string NamePT { get; set; } // nome ex: Acido ascorbico (Vitamina C) em portugues
public string NameEN { get; set; } // nome ex: Acido ascorbico (Vitamina C) em inglês
public string Details { get; set; } // detalhes sobre o aditivo, incluindo.
public HalalState HalalState; // estado: halal, haram ou desconhecido
public DateTime? LastUpdate { get; set; } // date e hora do registo
public virtual ICollection<Product> Products { get; set;}
}
}
我在寫代碼來實現對ProductRepository的方法,以用特定的添加劑獲得產品。
public ICollection<Product> GetProductsByAdditive(string key)
{
var products = context.Products;
var productsAdditives = new List<Product>();
foreach (var p in products)
{
var additives = p.Additives;
foreach (var a in additives)
{
if (a.Key.Equals(key))
productsAdditives.Add(p);
}
}
return productsAdditives.ToList();
//TODO: um Metodo úinico que permite pesquisa por nome em PT e EN e codigo
}
錯誤的第一個foreach循環後出現完全相同,在此聲明:
var additives = p.Additives;
PS:我使用的是EF 6. 我疊!請幫忙!
我的繼承人連接
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
</configSections>
<connectionStrings>
<add name="EatHalal"
providerName="System.Data.SqlClient"
connectionString="Server=192.168.1.150;Database=EatHalal;User Id=user;Password=password;MultipleActiveResultSets=true;"
/>
</connectionStrings>
</configuration>
你能顯示你的連接字符串嗎? – Sampath
我編輯了我的帖子並添加了連接。 – elmodai