WinForm下编写分页控件，实现DataGridView的分页效果

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    前几天做C/S项目的时候用到了分页查询，所以就想去网上找一些封装好的分页控件，类似BS项目中的那种。但是找了好几个都不是特别的好，没有自己想要的。而且WinForm 里面的DataGridView也不像WebForm里面的GridView那样有自带的分页功能。没办法还是自己动手封装一个吧，以后复用也方便。

从网上找了几个demo做了一下，实现挺简单的。

用到的方法就是编写一个用户控件，下面说明如何实现：

一，先画界面

新建一个用户控件，然后拖拽几个标签，文本框和按钮，排列好。如下图所示：

二，编写代码

    public partial class PagerControl : UserControl    {        #region 构造函数        public PagerControl()        {            InitializeComponent();        }        #endregion        #region 分页字段和属性        private int pageIndex = 1;        /// <summary>        /// 当前页数        /// </summary>        public virtual int PageIndex        {            get { return pageIndex; }            set { pageIndex = value; }        }        private int pageSize = 100;        /// <summary>        /// 每页记录数        /// </summary>        public virtual int PageSize        {            get { return pageSize; }            set { pageSize = value; }        }        private int recordCount = 0;        /// <summary>        /// 总记录数        /// </summary>        public virtual int RecordCount        {            get { return recordCount; }            set { recordCount = value; }        }        private int pageCount = 0;        /// <summary>        /// 总页数        /// </summary>        public int PageCount        {            get            {                if (pageSize != 0)                {                    pageCount = GetPageCount();                }                return pageCount;            }        }        #endregion        #region 页码变化时触发事件        public event EventHandler OnPageChanged;        #endregion        #region 分页及相关事件功能实现        /// <summary>        /// 设窗体控件全部可用        /// </summary>        private void SetFormCtrEnabled()        {            linkFirst.Enabled = true;            linkPrevious.Enabled = true;            linkNext.Enabled = true;            linkLast.Enabled = true;            btnGo.Enabled = true;        }        /// <summary>        /// 计算总页数        /// </summary>        /// <returns></returns>        private int GetPageCount()        {            if (PageSize == 0)            {                return 0;            }            int pageCount = RecordCount / PageSize;            if (RecordCount % PageSize == 0)            {                pageCount = RecordCount / PageSize;            }            else            {                pageCount = RecordCount / PageSize + 1;            }            return pageCount;        }        /// <summary>        /// 用于客户端调用        /// </summary>        public void DrawControl(int count)        {            recordCount = count;            DrawControl(false);        }        /// <summary>        /// 根据不同的条件，改变页面控件的呈现状态        /// </summary>        private void DrawControl(bool callEvent)        {                        lblCurrentPage.Text = PageIndex.ToString();            lblPageCount.Text = PageCount.ToString();            lblTotalCount.Text = RecordCount.ToString();            txtPageSize.Text = PageSize.ToString();            if (callEvent && OnPageChanged != null)            {                OnPageChanged(this, null);//当前分页数字改变时，触发委托事件            }            SetFormCtrEnabled();            if (PageCount == 1)//有且仅有一页时            {                linkFirst.Enabled = false;                linkPrevious.Enabled = false;                linkNext.Enabled = false;                linkLast.Enabled = false;                btnGo.Enabled = false;            }            else if (PageIndex == 1)//当前页为第一页时            {                linkFirst.Enabled = false;                linkPrevious.Enabled = false;            }            else if (PageIndex == PageCount)//当前页为最后一页时            {                linkNext.Enabled = false;                linkLast.Enabled = false;            }        }        #endregion        #region 相关控件事件        //首页按钮        private void linkFirst_Click(object sender, EventArgs e)        {            PageIndex = 1;            DrawControl(true);        }        //上一页按钮        private void linkPrevious_Click(object sender, EventArgs e)        {            PageIndex = Math.Max(1, PageIndex - 1);            DrawControl(true);        }        //下一页按钮        private void linkNext_Click(object sender, EventArgs e)        {            PageIndex = Math.Min(PageCount, PageIndex + 1);            DrawControl(true);        }        //尾页按钮        private void linkLast_Click(object sender, EventArgs e)        {            PageIndex = PageCount;            DrawControl(true);        }        /// <summary>        /// 按下enter键，执行跳转页面功能        /// </summary>        private void txtPageNum_KeyPress(object sender, KeyPressEventArgs e)        {            btnGo_Click(null, null);        }        /// <summary>        /// 跳转页数限制        /// </summary>        private void txtPageNum_TextChanged(object sender, EventArgs e)        {            int num = 0;            if (int.TryParse(txtPageNum.Text.Trim(), out num) && num > 0)            {   //TryParse 函数，将字符串转换成等效的整数，返回bool型，判断是否转换成功。                //输入除数字以外的字符是转换不成功的                if (num > PageCount)   //输入数量大于最大页数时，文本框自动显示最大页数                {                    txtPageNum.Text = PageCount.ToString();                }            }        }        /// <summary>        /// 跳转按钮        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btnGo_Click(object sender, EventArgs e)        {            int num = 0;            if (int.TryParse(txtPageNum.Text.Trim(), out num) && num > 0)            {                PageIndex = num;                DrawControl(true);            }        }        #endregion        bool isTextChanged = false;        /// <summary>        /// 每页显示的记录数改变时        /// </summary>        private void txtPageSize_TextChanged(object sender, EventArgs e)        {            int num = 0;            //输入不符合规范时，默认设置为100            if (!int.TryParse(txtPageSize.Text.Trim(), out num) || num <= 0)            {                num = 100;                txtPageSize.Text = "100";            }            else            {                isTextChanged = true;                            }            pageSize = num;        }        /// <summary>        /// 光标离开 每页设置文本框时，显示到首页        private void txtPageSize_Leave(object sender, EventArgs e)        {            if (isTextChanged)            {                isTextChanged = false;                linkFirst_Click(null, null);            }        }    }

三，客户端调用

    public partial class frmPagerDemo : Form    {        public frmPagerDemo()        {            InitializeComponent();        }        private void StartForm_Load(object sender, EventArgs e)        {            //创建一个文件数据库表。            MDataTable.CreateSchema("Users.txt", false, new string[] { "选择", "用户名", "密码", "性别", "注册日期" }, SqlDbType.Bit, SqlDbType.NVarChar, SqlDbType.NVarChar, SqlDbType.NVarChar, SqlDbType.NVarChar);                        for (int i = 0; i < 200; i++)//插入200条数据。            {                using (MAction action = new MAction("Users.txt", "Txt Path={0}"))                {                    action.Set("选择", i % 2 == 0);                    action.Set("用户名", "Obama_" + i);                    action.Set("密码", "123" + i);                    action.Set("性别", "男");                    action.Set("注册日期", DateTime .Now.ToShortDateString());                    action.Insert(InsertOp.None);                }            }            LoadData();            //激活OnPageChanged事件            pagerControl1.OnPageChanged += new EventHandler(pagerControl1_OnPageChanged);        }        /// <summary>        /// 页数变化时调用绑定数据方法        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void pagerControl1_OnPageChanged(object sender, EventArgs e)        {            LoadData();        }        /// <summary>        /// 重新加载数据        /// </summary>        private void LoadData()        {            int count;            using (MAction action = new MAction("Users.txt", "Txt Path={0}"))            {                action.Select(pagerControl1.PageIndex, pagerControl1.PageSize, string.Empty, out count).Bind(gvUsers);                pagerControl1.DrawControl(count);            }        }    }

四，显示效果

至此一个WinForm版的分页控件制作就完成了。

有问题的地方欢迎指出。

代码下载：http://download.csdn.net/detail/u010028869/7983011