Question

我首先使用实体框架4.1代码。

我有一个GrantApplication课程：

public class GrantApplication
{
   // Just some of the properties are listed
   public int Id { get; set; }
   public GrantApplicationState GrantApplicationState { get; set; }
}

GrantApplicationState是一个枚举，看起来像这样：

public enum GrantApplicationState
{
   Applying = 1,
   Submitted = 2,
   cknowledged = 3
}

在我去添加授权应用程序数据库之前，我设置了授权应用程序状态：

public void Insert(GrantApplication grantApplication)
{
   // Set the current state to applying
   grantApplication.GrantApplicationState = GrantApplicationState.Applying;

   // Insert the new grant application
   grantApplicationRepository.Insert(grantApplication);
}

在我的数据库中，我有一个GrantApplication表，其中GrantApplicationStateId链接到GrantApplicationState表。

如何让EF将状态ID从GrantApplication.GrantApplicationState添加到GrantApplicationStateId列？这可能吗？当我检索GrantApplication对象时，它也需要设置。这是这样做的方法还是我必须在我的GrantApplication类中创建另一个名为GrantApplicationStateId的属性？

Answer 1

您必须创建另一个属性：

public class GrantApplication
{

   public int Id { get; set; }
   ...

   public int GrantApplicationStateId { get; set; }

   [NotMapped] // Perhaps not need
   public GrantApplicationState GrantApplicationState 
   { 
       get { return (GrantApplicationState)GrantApplicationStateId; }
       set { GrantApplicationStateId = (int)value; }
   }
}

EFv4.1根本不支持枚举 - 您无法映射它们。这将在EFv4.2中发生变化。

Answer 2

仍然EF不支持Enums ..它将在EF 5.0上。检查我的尝试在这里 http://the--semicolon.blogspot.com/p/handling-enum-in-code-first-entity.html

首先使用带有Entity Framework 4.1代码的枚举

2 个答案: