实体框架 - 在数据库中保存枚举的ICollection [英] Entity Framework - Save ICollection of Enumeration in database
问题描述
我有一个属性类型为 ICollection&Enum>
的类。
例如说我们有以下枚举
:
public enum CustomerType
{
VIP,
FrequentCustomer,
BadCustomer
}
$ c $我们还有以下类: public class Customer
{
public int Id {get; set; }
public string FirstName {get; set; }
public string LastName {get; set; }
public ICollection< CustomerType> CustomerAtrributes {get; set; }
}
如何存储属性 CustomerAtrributes <数据库中的code>可以在以后轻松检索?
例如,我正在寻找类似以下内容:
CustomerId |名字|姓氏| CustomerType |
1 |鲍勃|史密斯VIP |
1 |鲍勃|史密斯FrequentCustomer |
2 |迈克|约旦| BadCustomer |
编辑:我使用EntityFramework 6将我的对象存储在数据库中,使用CodeFirst方法。 / p>
编辑:朋友发现可能的重复: ef 5在数据库中未生成的代码第一个枚举集合。但是,如果您有任何不同的想法或解决方法,请发布。
解决方案枚举仍然是原始类型,特别是整数。就像你的 Costumer
类不能有映射到数据库中的东西的 ICollection< int>
不要收集枚举。
您必须创建一个CostumerType类并重命名枚举:
public enum TypesOfCostumer // example name
{
VIP,
FrequentCustomer,
BadCustomer
}
public class CostumerType
{
public int Id {get;组; }
public TypesOfCostumer Type {get; set;}
}
I have a class with a property of type ICollection<Enum>
.
Say for example we have the following enumeration
:
public enum CustomerType
{
VIP,
FrequentCustomer,
BadCustomer
}
We also have the following class:
public class Customer
{
public int Id { get;set; }
public string FirstName { get;set; }
public string LastName { get;set; }
public ICollection<CustomerType> CustomerAtrributes { get;set; }
}
How can I store the property CustomerAtrributes
in the database to be easily retrieved later?
For example I'm looking for something like the following:
CustomerId | FirstName | LastName | CustomerType |
1 | Bob | Smith | VIP |
1 | Bob | Smith | FrequentCustomer|
2 | Mike | Jordan | BadCustomer |
EDIT: I'm using EntityFramework 6 to store my objects in the database using the CodeFirst approach.
EDIT: A friend found a possible duplicate : ef 5 codefirst enum collection not generated in database .But please, if you have any different ideas or workarounds, post them.
解决方案 An enum is still a primitive type, in particular an integer. Just as your Costumer
class can't have an ICollection<int>
that maps to something in the database, it can't have a collection of the enum.
You have to create a CostumerType class and rename the enum:
public enum TypesOfCostumer //example name
{
VIP,
FrequentCustomer,
BadCustomer
}
public class CostumerType
{
public int Id { get; set; }
public TypesOfCostumer Type {get; set;}
}
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