using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace ProjectionByLinq
{
public partial class Frm_Main : Form
{
public Frm_Main()
{
InitializeComponent();
}
private void Frm_Main_Load(object sender, EventArgs e)
{
string ConnectionString = "server=WIN-GI7E47AND9R\LS; database=db_TomeTwo; uid=sa; pwd=";//聲明連接字符串
using (SqlConnection Conn = new SqlConnection(ConnectionString))//創建數據庫連接對象
{
string sqlstr = "select top 5* from tb_Bookinfo";//定義查詢語句
SqlDataAdapter da = new SqlDataAdapter(sqlstr, Conn);//創建數據橋接器對象
DataSet ds = new DataSet();//創建數據對象
da.Fill(ds, "tb_Bookinfo");//填充數據集
//查詢圖書信息表前3行數據的圖書名稱和作者
var result = from b in ds.Tables["tb_Bookinfo"].AsEnumerable()
select new
{
b_name = b.Field<string>("b_name"),
b_author = b.Field<string>("b_author")
};
foreach (var item in result)//遍歷輸出查詢結果
{
richTextBox1.Text +="圖書名稱:" + item.b_name + " ** 作者:" + item.b_author+"\n";
}
}
}
}
}