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(0),
                Name = dr.GetString(1),
                Desc = dr.GetString(2),
                CreateDate = dr.GetDateTime(3),
                ModifyDate = dr.GetDateTime(4)
            });
        }
        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[0].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。