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 Skip
{
public partial class Frm_Main : Form
{
public Frm_Main()
{
InitializeComponent();
}
private void Frm_Main_Load(object sender, EventArgs e)
{
QueryData(Convert.ToInt32(textBox1.Text));
}
private void button1_Click(object sender, EventArgs e)
{
QueryData(Convert.ToInt32(textBox1.Text));
}
private void QueryData(int? cnt)
{
string conStr = "Data Source=WIN-GI7E47AND9R\LS;Database=db_TomeTwo;UID=sa;Pwd=;";//取連接字符串
string sql = "select * from EmployeeInfo";//構造sql語句
DataSet ds = new DataSet();//創建數據集
using (SqlConnection con = new SqlConnection(conStr))//創建數據連接
{
SqlCommand cmd = new SqlCommand(sql, con);//創建Command對象
SqlDataAdapter sda = new SqlDataAdapter(cmd);//創建DataAdapter對象
sda.Fill(ds, "EmployeeInfo");//填充數據集
}
if (cnt == null || cnt <= 0)//如果參數爲空,取所有記錄
{
dataGridView1.DataSource = ds.Tables["EmployeeInfo"];//設置dataGridView1數據源
}
else//跳過參數指定的記錄數
{
try
{
IEnumerable<DataRow> query = ds.Tables["EmployeeInfo"].AsEnumerable().Skip(cnt ?? 0);//使用LINQ查詢數據集
dataGridView1.DataSource = query.CopyToDataTable();//設置dataGridView1數據源
}
catch { }
}
}
}
}