lyfz_repos/铂金版源码/LYFZ.ComponentLibrary/PagerEx.cs

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

namespace LYFZ.ComponentLibrary
{
    public partial class PagerEx : UserControl
    {  
        /// 声明委托
        /// </summary>
        /// <param name="e"></param>
        public delegate void EventPagingHandler(EventArgs e);
        /// <summary>
        /// 构造函数
        /// </summary>
        public PagerEx()
        {
            InitializeComponent();
           
        }
        public event EventPagingHandler EventPaging;

        #region 公开属性
        private int _pageSize;
        /// <summary>
        /// 每页显示记录数(默认10)
        /// </summary>
        public int PageSize
        {
            get
            {
                return _pageSize;
            }
            set
            {
                if (value > 0)
                {
                    _pageSize = value;
                }
                else
                {
                    _pageSize = 50;
                }
                this.comboPageSize.Text = _pageSize.ToString();
            }
        }
        private int _currentPage = 1;
        /// <summary>
        /// 当前页
        /// </summary>
        public int CurrentPage
        {
            get
            {
                return _currentPage;
            }
            set
            {
                if (value > 0)
                {
                    _currentPage = value;
                }
                else
                {
                    _currentPage = 1;
                }

            }
        }
        private int _totalCount = 0;
        /// <summary>
        /// 总记录数
        /// </summary>
        public int TotalCount
        {
            get
            {
                return _totalCount;
            }
            set
            {
                if (value >= 0)
                {
                    _totalCount = value;
                }
                else
                {
                    _totalCount = 0;
                }
                this.lblTotalCount.Text = this._totalCount.ToString();
                CalculatePageCount();
            }
        }

        private int _pageCount = 0;
        /// <summary>
        /// 页数
        /// </summary>
        public int PageCount
        {
            get
            {
                return _pageCount;
            }
            set
            {
                if (value >= 0)
                {
                    _pageCount = value;
                }
                else
                {
                    _pageCount = 0;
                }
                this.lblPageCount.Text = _pageCount + "";
            }
        }
        #endregion

        #region 算法与绑定
        /// <summary>
        /// 计算页数
        /// </summary>
        private void CalculatePageCount()
        {
            //总条数大于0
            if (this.TotalCount > 0)
            {
                this.PageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(this.TotalCount) / Convert.ToDouble(this.PageSize)));
                if (this.CurrentPage > this.PageCount)
                {
                    this.CurrentPage = this.PageCount;
                }
                this.txtBoxCurPage.Text = this.CurrentPage + "";
                this.lblTotalCount.Text = this.TotalCount + "";
                this.lblPageCount.Text = this.PageCount + "";
                if (this.CurrentPage == 1)
                {
                    this.btnFirst.Enabled = false;
                    this.btnPrev.Enabled = false;
                    this.lbtnGO.Enabled = true;
                }
                else
                {
                    this.btnFirst.Enabled = true;
                    this.btnPrev.Enabled = true;
                }
                if (this.CurrentPage == this.PageCount)
                {
                    this.btnNext.Enabled = false;
                    this.btnLast.Enabled = false;
                    this.lbtnGO.Enabled = true;
                }
                else
                {
                    this.btnLast.Enabled = true;
                    this.btnNext.Enabled = true;
                }
                //总数等于0
                if (this.TotalCount == 0)
                {
                    this.btnFirst.Enabled = false;
                    this.btnPrev.Enabled = false;
                    this.btnNext.Enabled = false;
                    this.btnLast.Enabled = false;
                    this.lbtnGO.Enabled = false;
                    this.txtBoxCurPage.Text = "";
                }
                if (this.CurrentPage < this.PageCount)
                {
                    this.btnNext.Enabled = true;
                }
                else { this.btnNext.Enabled = false; }

            }//总条数为空
            else
            {
                this.PageCount = 0;
                this.btnFirst.Enabled = false;
                this.btnPrev.Enabled = false;
                this.btnNext.Enabled = false;
                this.btnLast.Enabled = false;
                this.lbtnGO.Enabled = false;
                this.txtBoxCurPage.Text = "";
            }
        }
 

        /// <summary>
        /// 数据绑定
        /// </summary>
        public void Bind()
        {
            if (this.EventPaging != null)
            {
                this.EventPaging(new EventArgs());
            }
            if (this.CurrentPage > this.PageCount)
            {
                this.CurrentPage = this.PageCount;
            }
            this.txtBoxCurPage.Text = this.CurrentPage + "";
            this.lblTotalCount.Text = this.TotalCount + "";
            this.lblPageCount.Text = this.PageCount + "";
            if (this.CurrentPage == 1)
            {
                this.btnFirst.Enabled = false;
                this.btnPrev.Enabled = false;
            }
            else
            {
                this.btnFirst.Enabled = true;
                this.btnPrev.Enabled = true;
            }
            if (this.CurrentPage == this.PageCount)
            {
                this.btnNext.Enabled = false;
                this.btnLast.Enabled = false;
                this.lbtnGO.Enabled = true;
            }
            else
            {
                this.btnLast.Enabled = true;
                this.btnNext.Enabled = true; 
            }  
            //总数等于0
            if (this.TotalCount == 0)
            {
                this.btnFirst.Enabled = false;
                this.btnPrev.Enabled = false;
                this.btnNext.Enabled = false;
                this.btnLast.Enabled = false;
                this.lbtnGO.Enabled = false;
                this.txtBoxCurPage.Text = "";
            }
            if (this.CurrentPage < this.PageCount)
            {
                this.btnNext.Enabled = true;
            }
            else { this.btnNext.Enabled = false; }
        }
        #endregion

        #region 按钮事件
        private void btnFirst_Click(object sender, EventArgs e)
        {
            this.CurrentPage = 1;
            this.Bind();
        }

        private void btnPrev_Click(object sender, EventArgs e)
        {
            this.CurrentPage -= 1;
            this.Bind();
        }

        private void btnNext_Click(object sender, EventArgs e)
        {
            this.CurrentPage += 1;
            this.Bind();
        }

        private void btnLast_Click(object sender, EventArgs e)
        {
            this.CurrentPage = this.PageCount;
            this.Bind();
        }

        private void lbtnGO_Click(object sender, EventArgs e)
        {
            try
            {
                Convert.ToInt32(txtBoxCurPage.Text);
                if (Convert.ToInt32(txtBoxCurPage.Text) > PageCount || Convert.ToInt32(txtBoxCurPage.Text) == PageCount)
                {

                    this.txtBoxCurPage.Text = this.PageCount.ToString();
                    this.CurrentPage = PageCount;
                    this.Bind();
                }
                else
                {
                    this.CurrentPage = Convert.ToInt32(txtBoxCurPage.Text);
                    this.Bind();

                }
            }
            catch
            {
                MessageBoxCustom.Show("请输入数字");
            }
        }
        private void txtBoxCurPage_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!Char.IsNumber(e.KeyChar) && !Char.IsControl(e.KeyChar))
            {
                MessageBoxCustom.Show("请输入数字");
                e.Handled = true;
            }
        }
        #endregion
    }
}