LINQ to Entities在结果上拆分字符串

Question

I have a LINQ statement as follows:

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();

This fails because split function fails on IpAddresses as LINQ to Entities cannot translate this query to SQL.

This makes sense, but then what's an equivalent way of accomplishing this elegantly? The only way I've thought of is to manually run a loop on the retrieved string then splitting it, but I'd like to get it in one go.

Answer 1

You can use AsEnumerable to make the select occur in memory instead of EF.

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()
    });