一个Entity Framework、ADO.NET查询性能测试

Entity Framework自然是会比ADO.NET性能慢点，这个不多说了。直接上结果。

本该用测试项目的，不过我建了个aspx。下面是随便测20遍得到的结果

补充！！把12行改成 list = db.Role.AsNoTracking().ToList();
由于这只做查询，不需要上下文进行跟踪。效率瞬间提升平均3-5倍，超越SqlDataAdapter，（其实很多人用SqlDataAdapter而不是用SqlCommand）

测试代码（建aspx，nuget拿EF6.1dll，建数据库建表Role，自己插入6万条数据，有主键自增）

         string connStr = "server=localhost;database=EF;uid=sa;pwd=your1234;Persist Security Info=True";

         List<Role> list = new List<Role>();
         DateTime start = DateTime.MinValue;
         DateTime end = DateTime.MinValue;

         Response.Write("查询6万条数据耗时测试 <br />");
         using (var db = new DBContext(connStr))
         {
             start = DateTime.Now;
             list = db.Role.ToList();
             end = DateTime.Now;
             Response.Write("EF6.1，耗时：" + (end - start).ToString() + " <br />");
         }

         start = DateTime.Now;
         SqlConnection conn = new SqlConnection(connStr);
         conn.Open();
         SqlCommand cmd = new SqlCommand("select * from [Role]", conn);
         SqlDataReader dr = cmd.ExecuteReader();
         while (dr.Read())
         {
             list.Add(new Role()
             {
                 ID = dr.GetInt32(),
                 Name = dr.GetString(),
                 Desc = dr.GetString(),
                 CreateDate = dr.GetDateTime(),
                 ModifyDate = dr.GetDateTime()
             });
         }
         dr.Close();

         end = DateTime.Now;
         Response.Write("ADO.NET SqlCommand + SqlDataReader，耗时：" + (end - start).ToString() + " <br />");

         start = DateTime.Now;
         SqlDataAdapter sda = new SqlDataAdapter("select * from [Role]", conn);
         var ds = new DataSet();
         sda.Fill(ds);
         list = (from item in ds.Tables[].AsEnumerable()
                select new Role
                {
                    ID = item.Field<int>("ID"),
                    Name = item.Field<string>("Name"),
                    Desc = item.Field<string>("Desc"),
                    CreateDate = item.Field<DateTime>("CreateDate"),
                    ModifyDate = item.Field<DateTime>("ModifyDate"),

                }).ToList();

         conn.Close();

         end = DateTime.Now;
         Response.Write("ADO.NET SqlDataAdapter + DataSet，耗时：" + (end - start).ToString() + " <br />");

EF其实是不错的东西，楼主很喜欢；很多人说EF性能差，不过我觉得EF很利于开发进度。