分页控件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace HospitalInfoManage
{
    public partial class PageControl : UserControl
    {
        public PageControl()
        {
            InitializeComponent();
        }
        #region 分页字段和属性

        private int pageIndex = 1;
        /// <summary>
        /// 当前页面
        /// </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 = 1;
        /// <summary>
        /// 总页数
        /// </summary>
        public int PageCount
        {
            get
            {
                if (pageSize != 0)
                {
                    pageCount = GetPageCount();
                    if (pageCount==0)
                    {
                        //pageIndex = 0;
                        pageCount = 1;
                    }
                }
                return pageCount;
            }
        }

        private string jumpText;
        /// <summary>
        /// 跳转按钮文本
        /// </summary>
        public string JumpText
        {
            get
            {
                if (string.IsNullOrEmpty(jumpText))
                {
                    jumpText = "Go";
                }
                return jumpText;
            }
            set { jumpText = value; }
        }

        #endregion 
        #region 页码变化触发事件

        public event EventHandler OnPageChanged;
        public event EventHandler OnOutExcel;

        #endregion
        #region 分页及相关事件功能实现

        private void SetFormCtrEnabled()
        {
            btnFirst.Enabled = true;
            btnPrev.Enabled = true;
            btnNext.Enabled = true;
            btnLast.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;
            }
            //if (pageCount<PageIndex)
            //{
            //    PageIndex = 1;
            //    DrawControl(true);
            //}
            return pageCount;
        }
        /// <summary>
        /// 外部调用
        /// </summary>
        public void DrawControl(int count)
        {
            recordCount = count;
            DrawControl(false);
        }
        /// <summary>
        /// 页面控件呈现
        /// </summary>
        private void DrawControl(bool callEvent)
        {
            if (callEvent && OnPageChanged != null)
            {
                OnPageChanged(this, null);//当前分页数字改变时，触发委托事件
            }

            btnGo.Text = JumpText;
            txtPageCount.Text = PageCount.ToString();
            txtPageIndex.Text = PageIndex.ToString();
            txtPageCount.Size = new Size(txtPageCount.Text.Length * 20, 20);
            txtPageIndex.Size = new Size(txtPageIndex.Text.Length * 20, 20);
            lblDataCount.Text = string.Format("共{0}条记录", RecordCount.ToString());
            lblSize.Text = string.Format("每页{0}条记录", PageSize.ToString());
            SetFormCtrEnabled();
            if (PageCount == 1 || PageCount == 0)//有且仅有一页
            {
                btnFirst.Enabled = false;
                btnPrev.Enabled = false;
                btnNext.Enabled = false;
                btnLast.Enabled = false;
                btnGo.Enabled = false;
            }
            else if (PageIndex == 1)//第一页
            {
                btnFirst.Enabled = false;
                btnPrev.Enabled = false;
            }
            else if (PageIndex == PageCount)//最后一页
            {
                btnNext.Enabled = false;
                btnLast.Enabled = false;
            }
        }

        #endregion
        #region 相关控件事件
        /// <summary>
        /// 第一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnFirst_Click(object sender, EventArgs e)
        {
            PageIndex = 1;
            DrawControl(true);
        }
        /// <summary>
        /// 上一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnPrev_Click(object sender, EventArgs e)
        {
            PageIndex = Math.Max(1, PageIndex - 1);
            DrawControl(true);
        }
        /// <summary>
        /// 下一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnNext_Click(object sender, EventArgs e)
        {
            PageIndex = Math.Min(PageCount, PageIndex + 1);
            DrawControl(true);
        }
        /// <summary>
        /// 最后一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnLast_Click(object sender, EventArgs e)
        {
            PageIndex = PageCount;
            DrawControl(true);
        }
        /// <summary>
        /// enter键功能
        /// </summary>
        private void txtPageNum_KeyPress(object sender, KeyPressEventArgs e)
        {
            btnGo_Click(null, null);
        }
        /// <summary>
        /// 跳转页数限制
        /// </summary>
        private void txtCurrentPage_TextChanged(object sender, EventArgs e)
        {
            int num = 0;
            if (int.TryParse(txtCurrentPage.Text.Trim(), out num) && num > 0)
            {
                if (num > PageCount)
                {
                    txtCurrentPage.Text = PageCount.ToString();
                }
            }
        }

        /// <summary>
        /// 跳转
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnGo_Click(object sender, EventArgs e)
        {
            int num = 1;
            if (int.TryParse(txtCurrentPage.Text.Trim(), out num) && num > 0)
            {
                PageIndex = num;
                DrawControl(true);
            }
        }

        #endregion
        /// <summary>
        /// 每页显示数据量变更时
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void txtPageSize_TextChanged(object sender, EventArgs e)
        {
            int num = 0;
            if (int.TryParse(txtPageSize.Text.Trim(), out num) && num > 0)
            {
                if (num > 10000)
                {
                    txtPageSize.Text = "10000";
                }
            }
        }
        /// <summary>
        /// 保存设置
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            if (txtPageSize.Text.Trim().Length>0)
            {
                PageSize = int.Parse(txtPageSize.Text.Trim());
                PageIndex = 1;
                DrawControl(true); 
            }
        }
        /// <summary>
        /// 导出Excle
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            if (OnOutExcel!=null)
            {
                OnOutExcel(null, null);
            }
        }

    }
}

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