linq DataContext.ExecuteQuery() 返回映射实体

Linq ：

 

  string sqlstr = @"select * from dbo.satellitemap where tileindex={0}";

                IEnumerable<satellitemapMetadata> objs = datacontext.ExecuteQuery<satellitemapMetadata>(sqlstr, s).ToList ();

                foreach (satellitemapMetadata sata in objs)                {                    textBox3.Text += sata.tileindex + ",";                    

                }

映射实体：

 

[Table(Name = "dbo.satellitemap")]    public class satellitemapMetadata    {        [Column (IsPrimaryKey =true )]        public string tileindex { get; set; }        public Nullable<int> tilex { get; set; }        public Nullable<int> tiley { get; set; }        public Nullable<int> zoomlevel { get; set; }        public byte[] map { get; set; }        public Nullable<int> mapsize { get; set; }        public Nullable<DateTime> takephototime { get; set; }    }

 

注意两条：

 

类定义字段顺序必须和数据库的一直；

类定义主键：“ [Column (IsPrimaryKey =true )]”