如何从数据库创建基于模型的 C# 列表答案

【问题标题】：How to create Model based C# List from Database如何从数据库创建基于模型的 C# 列表
【发布时间】：2017-10-24 16:36:44
【问题描述】：

我有通过实体框架创建的模型：

public partial class Order
{
    public Order()
    {
        this.OrderDetails = new HashSet<OrderDetail>();
    }

    public int OrderID { get; set; }
    public string OrderNo { get; set; }
    public System.DateTime OrderDate { get; set; }
    public string Description { get; set; }

    public virtual ICollection<OrderDetail> OrderDetails { get; set; }
}

然后是另一个详细信息表：

 public partial class OrderDetail
{
    public int OrderItemsID { get; set; }
    public int OrderID { get; set; }
    public string ItemName { get; set; }
    public int Quantity { get; set; }
    public decimal Rate { get; set; }
    public decimal TotalAmount { get; set; }

    public virtual Order Order { get; set; }
}

 To See the Master Detail Data I made MasterDetails model As:

 public class OrderVM
{
    public string OrderNo { get; set; }
    public DateTime OrderDate { get; set; }
    public string Description { get; set; }
    public List<OrderDetail> OrderDetails {get;set;}
}

我正在尝试创建一个返回带有 Join 查询结果的 LIST 的方法，但是我收到#Anonymous 类型错误，这是我的代码：

public static List<OrderVM > mylist()
    {
        List<OrderVM> slist = new List<OrderVM>();

        using (MyDatabaseEntities1 dc = new MyDatabaseEntities1())
        {
            var myvalues = from O in dc.Orders
                          join D in dc.OrderDetails
                          on
                          O.OrderID equals D.OrderID
                          select new
                           {
                               O.OrderID,
                               O.OrderDate,
                               D.Quantity,
                               D.Rate
                           };


              foreach(var myorders in myvalues)
              {
                  slist.Add(myorders);
              }

              return slist;


        }
    }

我需要帮助我如何创建包含数据库字段的通用列表

【问题讨论】：

标签： entity-framework relational-database generic-list

【解决方案1】：

创建新类：

public class OrderDetailsModel
{
    public int OrderId { get; set; }

    public DateTime OrderDate { get; set; }

    public int Quantity { get; set; }

    public decimal Rate { get; set; }
}

并从您的方法返回此类的对象列表：

    using (MyDatabaseEntities1 dc = new MyDatabaseEntities1())
    {
        var myvalues = from O in dc.Orders
                      join D in dc.OrderDetails
                      on
                      O.OrderID equals D.OrderID
                      select new OrderDetailsModel
                      {
                          OrderId = O.OrderID,
                          OrderDate = O.OrderDate,
                          Quantity = D.Quantity,
                          Rate = D.Rate
                      };


          return myvalues.ToList();
    }

【讨论】：

感谢您的帮助