winform中DataGridView实现分页功能

//窗体构造方法中定义分页所需变量：

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

DataTable dtInfo = new DataTable();  //存取查询数据结果

//分页功能实现

public void InitDataSet()

{

    //判断每页显示记录数是否为空，在初始话窗体时为真

    if (txtRecordNumOfPage.Text.Trim() == "")

    {

        try

        {

            //pageSize = Convert.ToInt16(ConfigurationManager.AppSettings["PageSize"]);      //设置页面行数

            //读取配置文件中设置的每页显示条数

            string szConfigFileName = Application.ExecutablePath + ".config";

            XmlDocument doc = new XmlDocument();

            doc.Load(szConfigFileName);

            XmlNode root = doc.SelectSingleNode("configuration");

            XmlNode node = root.SelectSingleNode("appSettings/add[@key=‘PageSize‘]");

            XmlElement el = node as XmlElement;

            pageSize = Convert.ToUInt16(el.GetAttribute("value"));

        }

        catch

        {

        }

        if (pageSize == 0)

        {

            pageSize = 20;        //如果读取配置文件失败，则默认将每页显示条数设置为20

        }

        txtRecordNumOfPage.Text = pageSize.ToString();    //界面显示的“每页记录数”赋值

    }

    else

    {

        //读取界面设置的每页显示条数

        pageSize = Convert.ToUInt16(txtRecordNumOfPage.Text.Trim());

    }

        //总记录数赋值

        nMax = dtInfo.Rows.Count;

        pageCount = (nMax / pageSize);    //采用整除计算页数

        //判断整除后是否有余数，有则对页数进行+1

        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

        //调用显示数据方法

        LoadData();

}

//显示数据方法

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

    //判断查询结果是否为空

    if (dtInfo.Rows.Count == 0)

    {

        dgvExperInfo.DataSource = null;

        return;

    }

    else

    {

        DataTable dtTemp = dtInfo.Clone();   //克隆DataTable结构，即将字段名称进行复制

        if (pageCurrent == 1)

        {

            bindingNavigatorMoveFirstPage.Enabled = false;

            bindingNavigatorMovePreviousPage.Enabled = false;

        }

        else

        {

            bindingNavigatorMoveFirstPage.Enabled = true;

            bindingNavigatorMovePreviousPage.Enabled = true;

        }

        if (pageCurrent == pageCount)

        {

            nEndPos = nMax;

            bindingNavigatorMoveLastPage.Enabled = false;

            bindingNavigatorMoveNextPage.Enabled = false;

        }

        else

        {

            bindingNavigatorMoveLastPage.Enabled = true;

            bindingNavigatorMoveNextPage.Enabled = true;

            nEndPos = pageSize * pageCurrent;

        }

        nStartPos = nCurrent;

        lblPageCount.Text = pageCount.ToString();             //界面显示总页数

        lblCurrentPage.Text = Convert.ToString(pageCurrent);//当前页数

        txtCurrentPage.Text = Convert.ToString(pageCurrent);//跳转到页数的显示

        //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;

        dgvExperInfo.DataSource = bdsInfo;

        dgvExperInfo.ClearSelection();

    }

}

//BindingNavigator控件上的项目点击事件，通过配置各个Item的Text值进行判断执行

private void bdnInfo_ItemClicked(object sender, ToolStripItemClickedEventArgs e)

{

    if (e.ClickedItem.Text == "上一页")

    {

        pageCurrent--;

        if (pageCurrent <= 0)

        {

           MessageBox.Show("已经是第一页，请点击“下一页”查看！");

           pageCurrent++;

           return;

        }

        else

        {

           nCurrent = pageSize * (pageCurrent - 1);

        }

        LoadData();

     }

    if (e.ClickedItem.Text == "下一页")

    {

        pageCurrent++;

        if (pageCurrent > pageCount)

        {

            MessageBox.Show("已经是最后一页，请点击“上一页”查看！");

            pageCurrent--;

            return;

         }

       else

       {

           nCurrent=pageSize*(pageCurrent-1);

       }

       LoadData();

    }

    if (e.ClickedItem.Text == "首页")

    {

        pageCurrent = 1;

        nCurrent = 0;

        LoadData();

    }

    if (e.ClickedItem.Text == "尾页")

    {

        pageCurrent = pageCount;

        nCurrent = pageSize * (pageCurrent - 1);

        LoadData();

    }

}

//跳转页实现

private void btnPage_Click(object sender, EventArgs e)

{

    if (txtCurrentPage.Text.Trim() != "")

    {

        pageCurrent = Convert.ToInt16(txtCurrentPage.Text.Trim());

        //若输入页号大于最大显示页号，则跳转至最大页

        if (pageCurrent > pageCount)

        {

            pageCurrent = pageCount;

            nCurrent = pageSize * (pageCurrent - 1);

        }

        //若输入页号小于1，则跳转至第一页

        else if (pageCurrent < 1)

        {

            pageCurrent = 1;

            nCurrent = 0;

            LoadData();

        }

        //跳转至输入页号

        else

        {

            nCurrent = pageSize * (pageCurrent - 1);            //当前行数定位

        }

        //调用加载数据方法

        LoadData();

    }

}

//当前页输入字符限制

private void txtCurrentPage_TextChanged(object sender, EventArgs e)

{

    bool IsNum = true;

    foreach (char c in txtCurrentPage.Text.Trim())

    {

        if (!char.IsNumber(c)) { IsNum = false; break; }

    }

    if (IsNum == false)

    {

        txtCurrentPage.Text = pageCurrent.ToString();

    }

}

//当前页回车事件调用跳转页的操作

private void txtCurrentPage_KeyPress(object sender, KeyPressEventArgs e)

{

    if (e.KeyChar == 13)

    {

        btnPage_Click(sender,e);

    }

}

//每页显示记录数变更事件

private void txtRecordNumOfPage_TextChanged(object sender, EventArgs e)

{

    bool IsNum = true;

    //输入字符限制

    foreach (char c in txtRecordNumOfPage.Text.Trim())

    {

        if (!char.IsNumber(c)) { IsNum = false; break; }

    }

    if (IsNum == false)

    {

        txtRecordNumOfPage.Text = pageSize.ToString();

    }

    //判断输入的每页显示条数是否为空或是否为0，输入长度是否大于4位等情况

    if (txtRecordNumOfPage.Text.Trim() == "" || Convert.ToUInt32(txtRecordNumOfPage.Text.Trim()) == 0 || txtRecordNumOfPage.Text.Trim().Length > 4)

    {

        txtRecordNumOfPage.Text = pageSize.ToString();

    }

    //规避了特殊情况后直接调用显示数据方法

    LoadDocInfoToDGV();

}