C# datagridview分页功能

　　winform开发是或多或少都会接触datagridview控件，如果数据量大，那么必须使用分页功能，但是datagridview自身并没有分页，所以我们要自己实现。在网上搜了一些发现没有太适合自己的，要么嫌代码过于多不想看，要么自己理解差无法明白其原理，所以打算自己写一个，也希望帮到大家。

第一步：设置4个变量分别记录每页记录数、总记录数、总页数、当前页

        /// <summary>
        /// 每页记录数
        /// </summary>
        public int pageSize = 100;

        /// <summary>
        /// 总记录数
        /// </summary>
        public int recordCount = 0;

        /// <summary>
        /// 总页数
        /// </summary>
        public int pageCount = 0;

        /// <summary>
        /// 当前页
        /// </summary>
        public int currentPage = 0;

第二步：构造一个虚拟table用于显示（这里不连接数据库，如果需要自行更改），并算出总页数、总记录数。

DataTable table = new DataTable();

/// <summary>
/// 分页的方法
/// </summary>
/// <param name="str"></param>
private void PageSorter()     
{ 

    //创建虚拟表
    DataColumn column1 = new DataColumn("test1", Type.GetType("System.String"));  
    DataColumn column2 = new DataColumn("test2", Type.GetType("System.String"));
    DataColumn column3 = new DataColumn("test3", Type.GetType("System.String"));

    table.Columns.Add(column1);             //将列添加到table表中
    table.Columns.Add(column2);
    table.Columns.Add(column3);
    for (int i = 1; i <= 30000; i++)
    {
        DataRow dr = table.NewRow();            //table表创建行
        dr["test1"] = "资产编号" + i.ToString();
        dr["test2"] = "资产名称" + i.ToString();
        dr["test3"] = "规格型号" + i.ToString();
        table.Rows.Add(dr);                     //将数据加入到table表中
    }

    recordCount = table.Rows.Count;     //记录总行数
    pageCount = (recordCount / pageSize);
    if ((recordCount % pageSize) > 0)
    {
        pageCount++;
    }

    //默认第一页
    currentPage = 1;

    LoadPage( );//调用加载数据的方法
}

第三步：进行加载显示数据

/// <summary>
/// LoadPage方法
/// </summary>
private void LoadPage( )
{
    if (currentPage < 1) currentPage = 1;
    if (currentPage > pageCount) currentPage = pageCount;

    int beginRecord;    //开始指针
    int endRecord;      //结束指针
    DataTable dtTemp;
    dtTemp = table.Clone();

    beginRecord = pageSize * (currentPage - 1);
    if (currentPage == 1) beginRecord = 0;
    endRecord = pageSize * currentPage;

    if (currentPage == pageCount) endRecord = recordCount;
    for (int i = beginRecord; i < endRecord; i++)
    {
        dtTemp.ImportRow(table.Rows[i]);
    } 

    dataGridView1.Rows.Clear();

    for (int i = 0; i < dtTemp.Rows.Count; i++)
    { 
        dataGridView1.Rows.Add(new object[] { dtTemp.Rows[i][0] , dtTemp.Rows[i][1] , dtTemp.Rows[i][2] });
    } 

    labPageIndex.Text = "当前页: " + currentPage.ToString() + " / " + pageCount.ToString();//当前页
    labRecordCount.Text = "总行数: " + recordCount.ToString() + " 行";//总记录数
}

第四步：设置按钮点击事件

/// <summary>
/// 首页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnFirst_Click(object sender, EventArgs e)
{
    if (currentPage == 1)
    { return; }
    currentPage = 1;
    LoadPage();
}
/// <summary>
/// 上一页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnPrev_Click(object sender, EventArgs e)
{
    if (currentPage == 1)
    { return; }
    currentPage--;
    LoadPage();
}
/// <summary>
/// 下一页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnNext_Click(object sender, EventArgs e)
{
    if (currentPage == pageCount)
    { return; }
    currentPage++;
    LoadPage();
}
/// <summary>
/// 尾页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnLast_Click(object sender, EventArgs e)
{
    if (currentPage == pageCount)
    { return; }
    currentPage = pageCount;
    LoadPage();
}

第五步：load事件加载时显示数据

private void Form1_Load(object sender, EventArgs e)
{
    PageSorter();//分页 
}

最终展示结果

最后附上源码地址

　　链接: https://pan.baidu.com/s/1iJLHHef2p75xXMSlIbPVOw

　　提取码: sdh6

C# datagridview分页功能

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