DataGridView使用BindingNavigator实现简单分页功能

private int pageSize; //每页显示记录数
  private int pageIndex; //页序号
  private int totalCount; //总记录数
  private int pageCount; //总页数
  public BindingNavigatorMain()
  {
   InitializeComponent();
  }
  private void BindingNavigatorMain_Load(object sender, EventArgs e)
  {
   pageSize = 20;
   pageIndex = 0;
   SetPage();
  }
  //设置页
  private void SetPage()
  {
   //总记录数
   totalCount = 0;
   BindPage(pageSize, pageIndex + 1, out totalCount);
   //总页数
   if (totalCount % pageSize == 0)
    pageCount = totalCount / pageSize;
   else
    pageCount = totalCount / pageSize + 1;
   //当前页及总页数
   txtCurrentPage.Text = (pageIndex + 1).ToString();
   lblTotalPage.Text = "共 " + pageCount.ToString() + " 页";
   //BindingNavigator数据源不进行BindingSource赋值，但恢复控件可用性。
   bindingNavigatorMoveFirstItem.Enabled = true;
   bindingNavigatorMovePreviousItem.Enabled = true;
   txtCurrentPage.Enabled = true;
   lblTotalPage.Enabled = true;
   bindingNavigatorMoveNextItem.Enabled = true;
   bindingNavigatorMoveLastItem.Enabled = true;
  }
  /// <summary>
  /// 绑定页
  /// </summary>
  /// <param name="pageSize">每页显示记录数</param>
  /// <param name="pageIndex">页序号</param>
  /// <param name="totalCount">总记录数</param>
  private void BindPage(int pageSize, int pageIndex, out int totalCount)
  {
   SqlConnection conn = null;
   SqlCommand cmd = null;
   totalCount = 0;
   #region 连接数据库测试
   try
   {
    //数据库连接
    conn = new SqlConnection("server=.;database=DB_TEST;Uid=sa;pwd=********;");
    conn.Open();
    //SqlCommand
    cmd = new SqlCommand();
    cmd.Connection = conn;
    cmd.CommandText = "PageTest";
    cmd.CommandType = CommandType.StoredProcedure;
    SqlParameter[] param =
    {
     new SqlParameter("@PageSize",SqlDbType.Int),
     new SqlParameter("@PageIndex",SqlDbType.Int),
     new SqlParameter("@TotalCount",SqlDbType.Int)
    };
    param[0].Value = pageSize;
    param[1].Value = pageIndex;
    param[2].Direction = ParameterDirection.Output;
    cmd.Parameters.AddRange(param);
    //DataTable
    DataTable dt = new DataTable("MF_MO");
    dt.Columns.Add(new DataColumn("MO_NO", typeof(String)));
    dt.Columns.Add(new DataColumn("MRP_NO", typeof(String)));
    dt.Columns.Add(new DataColumn("QTY", typeof(Decimal)));
    dt.Columns.Add(new DataColumn("BIL_NO", typeof(String)));
    #region 方法一：SqlDataReader
    SqlDataReader dr = cmd.ExecuteReader();
    dt.Load(dr, LoadOption.PreserveChanges);
    dr.Close();
    totalCount = (int)param[2].Value;
    dataGridView1.DataSource = dt;
    #endregion
    #region #方法二：SqlDataAdapter
    //SqlDataAdapter da = new SqlDataAdapter();
    //da.SelectCommand = cmd;
    //dt.BeginLoadData();
    //da.Fill(dt);
    //dt.EndLoadData();
    //totalCount = (int)param[2].Value;
    //dataGridView1.DataSource = dt;
    #endregion
   }
   catch (Exception ex)
   {
    MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
   }
   finally
   {
    conn.Close();
    cmd.Dispose();
   }
   #endregion
  }
  /// <summary>
  /// 首页
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void bindingNavigatorMoveFirstItem_Click(object sender, EventArgs e)
  {
   pageIndex = 0;
   SetPage();
  }
  /// <summary>
  /// 上一页
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void bindingNavigatorMovePreviousItem_Click(object sender, EventArgs e)
  {
   pageIndex--;
   if (pageIndex < 0)
   {
    pageIndex = 0;
   }
   SetPage();
  }
  /// <summary>
  /// 下一页
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void bindingNavigatorMoveNextItem_Click(object sender, EventArgs e)
  {
   pageIndex++;
   if (pageIndex > pageCount - 1)
   {
    pageIndex = pageCount - 1;
   }
   SetPage();
  }
  /// <summary>
  /// 末页
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void bindingNavigatorMoveLastItem_Click(object sender, EventArgs e)
  {
   pageIndex = pageCount - 1;
   SetPage();
  }
  /// <summary>
  /// 只能按0-9、Delete、Enter、Backspace键
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void txtCurrentPage_KeyPress(object sender, KeyPressEventArgs e)
  {
   if ((e.KeyChar >= 48 && e.KeyChar <= 57) || e.KeyChar == 8 || e.KeyChar == 13 || e.KeyChar == 127)
   {
    e.Handled = false;
    if (e.KeyChar == 13)
    {
     Go();
    }
   }
   else
   {
    e.Handled = true;
   }
  }
  /// <summary>
  /// 指定页
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void btnGo_Click(object sender, EventArgs e)
  {
   Go();
  }
  private void Go()
  {
   if (string.IsNullOrEmpty(txtCurrentPage.Text))
   {
    MessageBox.Show("指定页不能为空。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
    txtCurrentPage.Focus();
    return;
   }
   if (int.Parse(txtCurrentPage.Text) > pageCount)
   {
    MessageBox.Show("指定页已超过总页数。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
    txtCurrentPage.Focus();
    return;
   }
   pageIndex = int.Parse(txtCurrentPage.Text) - 1;
   SetPage();
  }

CREATE PROCEDURE [dbo].[PageTest]
 @PageSize INT,
 @PageIndex INT,
 @TotalCount INT OUTPUT
AS
BEGIN
 --总记录数
 SELECT @TotalCount=COUNT(1) FROM MF_MO
 --记录返回(使用动态SQL绕开参数嗅探问题，效率大幅度提升。)
 DECLARE @SQL NVARCHAR(1000)
 SET @SQL=
  'SELECT TOP ('+CONVERT(VARCHAR(32),@PageSize)+') MO_NO,MRP_NO,QTY,BIL_NO '+
  'FROM MF_MO A '+
  'WHERE NOT EXISTS (SELECT 1 FROM (SELECT TOP ('+CONVERT(VARCHAR(32),(@PageIndex-1)*@PageSize)+') MO_NO FROM MF_MO ORDER BY MO_NO) B WHERE A.MO_NO=B.MO_NO) '+
  'ORDER BY MO_NO'
 EXEC (@SQL)
END