进行查询时出现Linq InvalidOperationException

好的,最后一次编辑,承诺:

使用以下类:

public partial class MembershipModule : BaseConnection<MembershipModule>
{
    private const string AccessPrivilege = "Access";

    public bool Accessible()
    {
        return this.Privileges().Any(p => p.Name.Equals(AccessPrivilege));
    }

    public IQueryable<MembershipAction> Privileges()
    {
        var privileges = from p in LinqUtil.Context.MembershipModuleActions
                         where
                             p.MembershipModule.Id.Equals(this.Id) &&
                             p.MembershipRolePrivileges.Any(rp => rp.ModuleActionId.Equals(p.Id))
                         select p.MembershipAction;

        return privileges;
    }
}

为什么这么做

    public static List<MembershipModule> Collection()
    {
        List<MembershipModule> collection = new List<MembershipModule>();

        if(!MembershipUser.Connected)
            return collection;

        foreach(MembershipModule m in LinqUtil.Context.MembershipModules)
        {
            if(m.Accessible())
                collection.Add(m);
        }

        return collection;
    }

而这不是?

    public static List<MembershipModule> Collection()
    {
        if(!MembershipUser.Connected)
            return new List<MembershipModule>();

        return LinqUtil.Context.MembershipModules.Where(m => m.Accessible()).ToList();
    }