Winform中WebService+DataGridView分页

在设计时需要一个DataGridView、BindingNavigate、BindingSource控件，分别命名为dgvInfo、bdnInfo、bdsInfo。

public partial class Form1 : Form
    {
        int pageSize = 0;     //每页显示行数
        int nMax = 0;         //总记录数
        int pageCount = 0;    //页数＝总记录数/每页显示行数
        int pageCurrent = 0;   //当前页号
        int nCurrent = 0;      //当前记录行
        DataSet ds = new DataSet();
        DataTable dtInfo = new DataTable();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            WebService.Service1 webSer = new WFDemo2.WebService.Service1();
            DataTable dt = webSer.StrongProduct("4928d4a552324277a3376ecdc5c284f6", "品牌,商品名称,型号,颜色,配置,商品ID,批发价,批发起订数量").Tables[0];
            dtInfo = dt; //dgvInfo.DataSource
            InitDataSet();
        }

        private void InitDataSet()
        {
            pageSize = 3; //设置页面行数
            nMax = dtInfo.Rows.Count; //记录总数
            pageCount = (nMax / pageSize);    //计算出总页数
            if ((nMax % pageSize) > 0) pageCount++;
            pageCurrent = 1;    //当前页数从1开始
            nCurrent = 0;       //当前记录数从0开始
            lblTotalRecord.Text = string.Format("共{0}条记录",nMax); //显示总记录数

            LoadData();
        }

        private void LoadData()
        {
            int nStartPos = 0;   //当前页面开始记录行
            int nEndPos = 0;     //当前页面结束记录行

            DataTable dtTemp = dtInfo.Clone();   //克隆DataTable结构框架

            if (pageCurrent == pageCount)
                nEndPos = nMax;
            else
                nEndPos = pageSize * pageCurrent;

            nStartPos = nCurrent;

            lblPageCount.Text = pageCount.ToString();
            txtCurrentPage.Text = Convert.ToString(pageCurrent);

            //从元数据源复制记录行
            for (int i = nStartPos; i < nEndPos; i++)
            {
                dtTemp.ImportRow(dtInfo.Rows[i]);
                nCurrent++;
            }

            bdsInfo.DataSource = dtTemp;
            bdnInfo.BindingSource = bdsInfo;
            dgvInfo.DataSource = bdsInfo;
        }

        private void bdnInfo_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {
            if (e.ClickedItem.Text == "上一页")
            {
                if (pageCurrent <= 1)
                {
                    //MessageBox.Show("已经是第一页，请点击下一页查看！");
                    return;
                }
                else
                {
                    pageCurrent--;
                    nCurrent = pageSize * (pageCurrent - 1);
                }

                LoadData();
            }
            if (e.ClickedItem.Text == "下一页")
            {
                if (pageCurrent >= pageCount)
                {
                    //MessageBox.Show("已经是最后一页，请点击上一页查看！");
                    return;
                }
                else
                {
                    pageCurrent++;
                    nCurrent = pageSize * (pageCurrent - 1);
                }

                LoadData();
            }
            if (e.ClickedItem.Text == "转到")
            {
                if (!string.IsNullOrEmpty(txtCurrentPage.Text))
                {
                    pageCurrent = int.Parse(txtCurrentPage.Text.Trim());
                    if (pageCurrent > pageCount || pageCurrent<1)
                    {
                        MessageBox.Show(string.Format("请输入0到{0}的值！",pageCount));
                        return; 
                    }
                    nCurrent = pageSize * (pageCurrent - 1);
                    LoadData();
                }
                else
                {
                    MessageBox.Show("请输入要转到的页号！");
                    return;
                }
            }
        }
    }