泛型，将字段添加为泛型

    protected void Button1_Click(object sender, EventArgs e)    {        // using System.Configuration;    // using System.Collections.Generic;        DataTable dt = new userBLL().SelectAll();        List<int> list = new List<int>();   //实例化        foreach(DataRow dr in dt.Rows)       //遍历id字段       {           int  id = Convert.ToInt32( dr["id"].ToString());           list.Add(id);        }        //for (int i = 0; i<list.Count; i++)         //遍历泛型        //{        //    int t=list[i];        //    Response.Write(t);        //}        foreach (int t in list)   //遍历泛型        {            Console.Write(t);        }    }

泛型