C# 如何使用NHibernate使用枚举？

在AccountType.cs中，我有：

namespace MooDB.Domain
{
    public enum AccountType {Real, Demo, Fictional};
}

public class Account : Entity
{        
    public virtual int Id { get; set; }
    public virtual Broker Broker { get; set; }
    public virtual string Name { get; set; }
    public virtual string NickName { get; set; }
    public virtual string AccountNumber { get; set; }
    public virtual Currency Currency { get; set; }
    public virtual AccountType AccountType { get; set; }
    public virtual bool IsActive { get; set; }
    public virtual bool IsDefault { get; set; }
}

在Account.cs中，我有：

namespace MooDB.Domain
{
    public enum AccountType {Real, Demo, Fictional};
}

public class Account : Entity
{        
    public virtual int Id { get; set; }
    public virtual Broker Broker { get; set; }
    public virtual string Name { get; set; }
    public virtual string NickName { get; set; }
    public virtual string AccountNumber { get; set; }
    public virtual Currency Currency { get; set; }
    public virtual AccountType AccountType { get; set; }
    public virtual bool IsActive { get; set; }
    public virtual bool IsDefault { get; set; }
}

在我的Account.hbm.xml中

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="MooDB"
                   namespace="MooDB.Domain">

  <class name="MooDB.Domain.Account,MooDB" table="accounts">
    <id name="Id" column="accountId" type="Int32" unsaved-value="0">
      <generator class="native" />
    </id>
    <version name="Version" column="version" type="integer" unsaved-value="0" />
    <many-to-one name ="Broker" column="brokerId" not-null="true" class="MooDB.Domain.Broker,MooDB" />
    <property name="Name" column="`name`" type="String" length="50" not-null="true" />
    <property name="NickName" column="nickName" type="String" length="50" not-null="true" />
    <property name="AccountNumber" column="accountNumber" type="String" length="50" not-null="true" />
    <many-to-one name ="Currency" column="currency" not-null="true" class="MooDB.Domain.Currency,MooDB" />
    <property name="AccountType" column="accountType" />
    <property name="IsActive" column="isActive" type="bool" not-null="true" />
    <property name="IsDefault" column="isDefault" type="bool" not-null="true" />
  </class>
</hibernate-mapping>

当我尝试测试对帐户的检索时，我从NHibernate得到以下错误：

Test 'Test.RepoTest.CanGetAccountById' failed: NHibernate.Exceptions.GenericADOException : could not load an entity: [MooDB.Domain.Account#1][SQL: SELECT account0_.accountId as accountId3_0_, account0_.version as version3_0_, account0_.brokerId as brokerId3_0_, account0_.[name] as name4_3_0_, account0_.nickName as nickName3_0_, account0_.accountNumber as accountN6_3_0_, account0_.currency as currency3_0_, account0_.accountType as accountT8_3_0_, account0_.isActive as isActive3_0_, account0_.isDefault as isDefault3_0_ FROM accounts account0_ WHERE account0_.accountId=?]
  ----> System.FormatException : Input string was not in a correct format.

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我所要做的就是在我的应用程序中有一个帐户类型列表，以便进行验证。我不想在数据库中有查找表。知道我做错了什么吗？

我认为NHibernate默认将枚举作为整数持久化（因为在.net中，枚举基本上是语法上的糖分，而不是整数），除非您告诉它。如果您真的需要它成为字符串，那么您需要实现一个IUserType。类似的例子是将字符串映射为布尔和

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使用Enum，您只需更改NullSafeGet和NullSafeSet中的逻辑即可映射到您的Enum，可能需要使用Enum.Parse或TryParse方法。

在AccountType映射中，使用以下值添加

type

属性

NHibernate.Type.EnumStringType`1[[MooDB.Domain.AccountType, MooDB]], NHibernate

通过为AccountType指定

type

属性，我们告诉NHibernate使用自定义 类以在.NET类型和数据库之间进行转换。NHibernate包括

EnumStringType

覆盖枚举值到数据库的转换 值，以便存储字符串名称，而不是数字值