datatable，datareader，dataset，SqlDataAdapter_new sqldataadapter datatable-优快云博客

本文链接：https://blog.youkuaiyun.com/jerrysbest/article/details/5856462

本文介绍了SQL数据适配器（SqlDataAdapter）和数据集（DataSet）的使用方法，通过ADO.NET技术实现了从数据库读取数据并填充到DataTable的过程，并通过自定义类扩展了数据填充功能。

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sqlDataAdapter sda = new SqlDataAdapter("select * from Couse",con);
DataSet ds = new DataSet();
sda.Fill(ds);
DataTable dt = new DateTable();
dt = ds.Table[0];

***************************************

SqlCommand com = new SqlCommand(sql, conn);
            SqlDataReader dr = com.ExecuteReader();
            DataTable dt=new DataTable();
            dt.Load(dr);

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using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["AdventureWorksConnectionString"].ConnectionString);
        con.Open();
        string str = "SELECT * FROM Person.[Address] ";
        SqlCommand cmd = new SqlCommand(str,con);
        SqlDataReader sdr = cmd.ExecuteReader();
        SqlDataAdapter sda = new SqlDataAdapter();
        myclass my = new myclass();
        DataTable dt = new DataTable();
        my.MyFill(dt, sdr);
        con.Close();

        this.GridView1.DataSource = dt;
        this.GridView1.DataBind();
    }

    public class myclass : System.Data.Common.DbDataAdapter
    {
        protected override int Fill(DataTable dataTable, IDataReader dataReader)
        {
            return base.Fill(dataTable, dataReader);
        }

        public int MyFill(DataTable dataTable, IDataReader dataReader)
        {
            return Fill(dataTable, dataReader);
        }
    }
}