得到“无法将PersistentGenericSet转换为ISet"的信息.错误 [英] Getting "unable to cast PersistentGenericSet to ISet" error

问题描述

我收到此错误:

无法转换类型的对象 'NHibernate.Collection.Generic.PersistentGenericSet 1[IocWinFormTestEntities.People]' to type 'System.Collections.Generic.ISet 1 [IocWinFormTestEntities.People]'.

Unable to cast object of type 'NHibernate.Collection.Generic.PersistentGenericSet1[IocWinFormTestEntities.People]' to type 'System.Collections.Generic.ISet1[IocWinFormTestEntities.People]'.

实体:

public class Event 
{
    public Event()
    {
        this.People = new HashSet<People>();
    }
    public virtual Guid Id { get; private set; }

    public virtual ISet<People> People { get; set; }
}

地图覆盖类:

public class EventMapOverride : IAutoMappingOverride<Event>
{
    public void Override(AutoMapping<Event> mapping)
    {
        mapping.HasMany(c => c.People)
            .AsSet()
            .Cascade.AllDeleteOrphan();
    }
}

从流利的自动映射器生成的hbm:

Generated hbm from fluent automapper:

<set cascade="all-delete-orphan" name="People">
    <key>
        <column name="Event_id" />
    </key>
    <one-to-many class="IocWinFormTestEntities.People, IocWinFormTestEntities, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
</set>

怎么了?

推荐答案

您的问题是您使用的是System.Collections.Generic名称空间中的"nofollow noreferrer> ISet ，但nHibernate期望ISet为Iesi.Collections.Generic.ISet<>.因此，将属性定义更改为

Your problem is you are using ISet in System.Collections.Generic namespace but nHibernate expects ISet to be Iesi.Collections.Generic.ISet<>. So change your property definition to

public virtual Iesi.Collections.Generic.ISet<People> People { get; set; }

如果要使用.net 4 ISet<>界面，请通过以下

If you want to use .net 4 ISet<> interface, go through this article

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