LINQ to Entities在结果上分割字符串

Question

我有一条LINQ语句，如下所示：

var playedBanDataList =
    from bannedPlayers in query
    select new PlayerBanData
    {
        Admin = bannedPlayers.Admin,
        BannedUntil = bannedPlayers.BannedUntil,
        IsPermanentBan = bannedPlayers.IsPermanentBan,
        PlayerName = bannedPlayers.PlayerName,
        Reason = bannedPlayers.Reason,
        IpAddresses = bannedPlayers.IpAddresses.Split(new [] {","}, StringSplitOptions.RemoveEmptyEntries).ToList()
    };

    return playedBanDataList.ToList();

这将失败，因为拆分功能失败，IpAddresses因为LINQ to Entities无法将此查询转换为SQL。

这是有道理的，但是优雅地实现这一目标的等效方法是什么？我想到的唯一方法是在检索到的字符串上手动运行一个循环，然后将其拆分，但我想一次获得它。

Answer 1

您可以AsEnumerable用来使选择发生在内存中，而不是EF中。

var playedBanDataList = query.AsEnumerable()
    .Select(bannedPlayers => new PlayerBanData
    {
        Admin = bannedPlayers.Admin,
        BannedUntil = bannedPlayers.BannedUntil,
        IsPermanentBan = bannedPlayers.IsPermanentBan,
        PlayerName = bannedPlayers.PlayerName,
        Reason = bannedPlayers.Reason,
        IpAddresses = bannedPlayers.IpAddresses.Split(
            new [] {","}, 
            StringSplitOptions.RemoveEmptyEntries).ToList()
    });