DataGridView使用自定义控件实现简单分页功能(推荐)

本例子使用自定义控件方法实现，数据库使用的是SQL Server，实现过程如下：

1、新建一个自定义控件，命名为：PageControl。

2、PageControl代码如下：

 public partial class PageControl : UserControl
  {
    //委托及事件
    public delegate void BindPage(int pageSize, int pageIndex, out int totalCount);
    public event BindPage BindPageEvent;
    //属性
    public int PageSize { get; set; } = 1; //每页显示记录数
    public int PageIndex { get; set; }   //页序号
    public int TotalCount { get; set; }   //总记录数
    public int PageCount { get; set; }   //总页数
    public PageControl()
    {
      InitializeComponent();
      //取消下划线
      linkFirst.LinkBehavior = LinkBehavior.NeverUnderline;
      linkPrev.LinkBehavior = LinkBehavior.NeverUnderline;
      linkNext.LinkBehavior = LinkBehavior.NeverUnderline;
      linkLast.LinkBehavior = LinkBehavior.NeverUnderline;
      linkGo.LinkBehavior = LinkBehavior.NeverUnderline;
    }
    /// <summary>
    /// 设置页
    /// </summary>
    public void SetPage()
    {
      //总记录数
      int totalCount = 0;
      BindPageEvent(PageSize, PageIndex + 1, out totalCount);
      TotalCount = 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";
    }
    /// <summary>
    /// 首页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkFirst_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
      if (e.Button == MouseButtons.Left)
      {
        PageIndex = 0;
        SetPage();
      }
    }
    /// <summary>
    /// 上一页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkPrve_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
      if (e.Button == MouseButtons.Left)
      {
        PageIndex--;
        if (PageIndex < 0)
        {
          PageIndex = 0;
        }
        SetPage();
      }
    }
    /// <summary>
    /// 下一页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkNext_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
      if (e.Button == MouseButtons.Left)
      {
        PageIndex++;
        if (PageIndex > PageCount - 1)
        {
          PageIndex = PageCount - 1;
        }
        SetPage();
      }
    }
    /// <summary>
    /// 末页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkLast_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
      if (e.Button == MouseButtons.Left)
      {
        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 txtSetPage_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 linkGo_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
      if (e.Button == MouseButtons.Left)
      {
        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();
    }
    /// <summary>
    /// linkFirst鼠标移过颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkFirst_MouseMove(object sender, MouseEventArgs e)
    {
      linkFirst.LinkColor = Color.Red;
    }
    /// <summary>
    /// linkFirst鼠标离开颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkFirst_MouseLeave(object sender, EventArgs e)
    {
      linkFirst.LinkColor = Color.Black;
    }
    /// <summary>
    /// linkPrev鼠标移过颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkPrev_MouseMove(object sender, MouseEventArgs e)
    {
      linkPrev.LinkColor = Color.Red;
    }
    /// <summary>
    /// linkPrev鼠标离开颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkPrev_MouseLeave(object sender, EventArgs e)
    {
      linkPrev.LinkColor = Color.Black;
    }
    /// <summary>
    /// linkNext鼠标移过颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkNext_MouseMove(object sender, MouseEventArgs e)
    {
      linkNext.LinkColor = Color.Red;
    }
    /// <summary>
    /// linkNext鼠标离开颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkNext_MouseLeave(object sender, EventArgs e)
    {
      linkNext.LinkColor = Color.Black;
    }
    /// <summary>
    /// linkLast鼠标移过颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkLast_MouseMove(object sender, MouseEventArgs e)
    {
      linkLast.LinkColor = Color.Red;
    }
    /// <summary>
    /// linkLast鼠标离开颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkLast_MouseLeave(object sender, EventArgs e)
    {
      linkLast.LinkColor = Color.Black;
    }
    /// <summary>
    /// linkGo鼠标移过颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkGo_MouseMove(object sender, MouseEventArgs e)
    {
      linkGo.LinkColor = Color.Red;
    }
    /// <summary>
    /// linkGo鼠标离开颜色
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void linkGo_MouseLeave(object sender, EventArgs e)
    {
      linkGo.LinkColor = Color.Black;
    }
  }

3、SQL Server创建存储过程PageTest：

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

4、新建一个WinForm程序，命名为Main，并拖入一个DataGridView控件及上面新建的PageControl控件，代码如下：

private void Main_Load(object sender, EventArgs e)
    {
      pageControl1.PageSize = 20;
      pageControl1.PageIndex = 0;
      pageControl1.BindPageEvent += BindPage;
      pageControl1.SetPage();
    }
    /// <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
    }

5、执行程序：

总结

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