linq查询到List <string>的语法

Question

我想做这样的事......

public static List<string> GetAttachmentKeyList()
{
    DataClassesDataContext dc = new DataClassesDataContext();

    List<string> list = from a in dc.Attachments
        select a.Att_Key.ToString().ToList();

    return list;
}

Visual Studio说......

无法将类型'System.Linq.IQueryable>'隐式转换为'System.Collections.Generic.List'.存在显式转换(您是否错过了演员？)

什么是正确的语法???

Answer 1

试一试

public static List<string> GetAttachmentKeyList()
{
    DataClassesDataContext dc = new DataClassesDataContext();

    List<string> list = ( from a in dc.Attachments
                          select a.Att_Key.ToString() ).ToList();

    return list;
}

Answer 2

试试这个,

public static List<string> GetAttachmentKeyList()
{
    DataClassesDataContext dc = new DataClassesDataContext();

    return dc.Attachments.Select(a=>a.Att_Key).ToList();
}