Eric的分页条小控件

利用QueryString实现分页参数传递的分页条控件, 纯UI层使用, 不影响分层, 简单实用!

主要属性: RecordCount

设计时图示:  

源代码:

using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

[assembly: TagPrefix("EFPlatform.WebControls", "efp")]
namespace EFPlatform.WebControls
{
    [ToolboxData("<{0}:PagerBar runat="server"></{0}:PagerBar>")]
    public class PagerBar : Control, INamingContainer
    {
        #region Properties

        #region Data(数据)
        #region CurrentPage
        [Category("Data")]
        [DefaultValue(1)]
        public int CurrentPage
        {
            get
            {
                if(ViewState["CurrentPage"] == null)
                {
                    try
                    {
                        ViewState["CurrentPage"] = int.Parse(HttpContext.Current.Request.QueryString[PageParamName]);
                    }
                    catch
                    {
                        ViewState["CurrentPage"] = 1;
                    }
                }

                return (int)ViewState["CurrentPage"];
            }

            set
            {
                ViewState["CurrentPage"] = value;
            }
        }
        #endregion

        #region PageSize
        [Category("Data")]
        [DefaultValue(10)]
        public int PageSize
        {
            get
            {
                int pageSize = (ViewState["PageSize"] == null) ? 10 : (int)ViewState["PageSize"];
                return (pageSize > 0) ? pageSize : 0;
            }

            set
            {
                ViewState["PageSize"] = value;
            }
        }
        #endregion

        #region RecordCount
        [Category("Data")]
        [DefaultValue(0)]
        public int RecordCount
        {
            get
            {
                return (ViewState["RecordCount"] == null) ? 0 : (int)ViewState["RecordCount"];
            }

            set
            {
                ViewState["RecordCount"] = value;
            }
        }
        #endregion

        #region PageCount
        [Browsable(false)]
        public int PageCount
        {
            get
            {
                return (int)Math.Ceiling((double)RecordCount / PageSize);
            }
        }
        #endregion
        #endregion

        #region Navigation(导航)
        #region PageParamName
        [Category("Navigation")]
        [DefaultValue("CurrentPage")]
        public string PageParamName
        {
            get
            {
                return (ViewState["PageParamName"] == null) ? "CurrentPage" : (string)ViewState["PageParamName"];
            }

            set
            {
                ViewState["PageParamName"] = value;
            }
        }
        #endregion

        #region FirstPageText
        [Category("Navigation")]
        [DefaultValue("首页")]
        public string FirstPageText
        {
            get
            {
                return (ViewState["FirstPageText"] == null) ? "首页" : (string)ViewState["FirstPageText"];
            }

            set
            {
                ViewState["FirstPageText"] = value;
            }
        }
        #endregion

        #region PrePageText
        [Category("Navigation")]
        [DefaultValue("上一页")]
        public string PrePageText
        {
            get
            {
                return (ViewState["PrePageText"] == null) ? "上一页" : (string)ViewState["PrePageText"];
            }

            set
            {
                ViewState["PrePageText"] = value;
            }
        }
        #endregion

        #region NextPageText
        [Category("Navigation")]
        [DefaultValue("下一页")]
        public string NextPageText
        {
            get
            {
                return (ViewState["NextPageText"] == null) ? "下一页" : (string)ViewState["NextPageText"];
            }

            set
            {
                ViewState["NextPageText"] = value;
            }
        }
        #endregion

        #region LastPageText
        [Category("Navigation")]
        [DefaultValue("末页")]
        public string LastPageText
        {
            get
            {
                return (ViewState["LastPageText"] == null) ? "末页" : (string)ViewState["LastPageText"];
            }

            set
            {
                ViewState["LastPageText"] = value;
            }
        }
        #endregion
        #endregion

        #region Layout(布局)
        #region Width
        [Category("Layout")]
        public Unit Width
        {
            get
            {
                return (ViewState["Width"] == null) ? Unit.Percentage(100) : (Unit)ViewState["Width"];
            }

            set
            {
                ViewState["Width"] = value;
            }
        }
        #endregion

        #region Height
        [Category("Layout")]
        public Unit Height
        {
            get
            {
                return (ViewState["Height"] == null) ? Unit.Pixel(20) : (Unit)ViewState["Height"];
            }

            set
            {
                ViewState["Height"] = value;
            }
        }
        #endregion

        #region CellPadding
        [Category("Layout")]
        [DefaultValue(0)]
        public int CellPadding
        {
            get
            {
                return (ViewState["CellPadding"] == null) ? 0 : (int)ViewState["CellPadding"];
            }

            set
            {
                ViewState["CellPadding"] = value;
            }
        }
        #endregion

        #region CellSpacing
        [Category("Layout")]
        [DefaultValue(0)]
        public int CellSpacing
        {
            get
            {
                return (ViewState["CellSpacing"] == null) ? 0 : (int)ViewState["CellSpacing"];
            }

            set
            {
                ViewState["CellSpacing"] = value;
            }
        }
        #endregion
        #endregion

        #region Appearance(外观)
        #region TableCssClass
        [Category("Appearance")]
        public string TableCssClass
        {
            get
            {
                return (ViewState["TableCssClass"] == null) ? string.Empty : (string)ViewState["TableCssClass"];
            }

            set
            {
                ViewState["TableCssClass"] = value;
            }
        }
        #endregion

        #region TableCellCssClass
        [Category("Appearance")]
        public string TableCellCssClass
        {
            get
            {
                return (ViewState["TableCellCssClass"] == null) ? string.Empty : (string)ViewState["TableCellCssClass"];
            }

            set
            {
                ViewState["TableCellCssClass"] = value;
            }
        }
        #endregion

        #region PagerCssClass
        [Category("Appearance")]
        public string PagerCssClass
        {
            get
            {
                return (ViewState["PagerCssClass"] == null) ? string.Empty : (string)ViewState["PagerCssClass"];
            }

            set
            {
                ViewState["PagerCssClass"] = value;
            }
        }
        #endregion
        #endregion

        #endregion

        #region GetPagerUrl
        private string GetPagerUrl()
        {
            StringBuilder sbUrl = new StringBuilder(HttpContext.Current.Request.Path);
            sbUrl.Append('?');
            NameValueCollection query = HttpContext.Current.Request.QueryString;

            for(int i = 0; i < query.Count; i++)
            {
                if(query.GetKey(i) != PageParamName)
                {
                    sbUrl.Append(query.GetKey(i));
                    sbUrl.Append('=');
                    sbUrl.Append(HttpContext.Current.Server.UrlEncode(query.Get(i)));
                    sbUrl.Append('&');
                }
            }

            sbUrl.Append(PageParamName);
            sbUrl.Append('=');
            return sbUrl.ToString();
        }
        #endregion

        #region GetPagerLinks
        private string[] GetPagerLinks()
        {
            string[] links = new string[5];
            int prePage = 1;
            int nextPage = 1;

            if(RecordCount > 0)
            {
                string pagerUrl = this.GetPagerUrl();
                prePage = (CurrentPage > 1) ? (CurrentPage - 1) : 1;
                nextPage = (CurrentPage + 1 > PageCount) ? PageCount : CurrentPage + 1;
                links[0] = pagerUrl + "1";
                links[1] = pagerUrl + prePage.ToString();
                links[2] = pagerUrl + nextPage.ToString();
                links[3] = pagerUrl + PageCount.ToString();
                links[4] = pagerUrl;
                return links;
            }
            else
            {
                CurrentPage = 0;
            }

            return links;
        }
        #endregion

        #region GetPagerOptions
        private string GetPagerOptions()
        {
            StringBuilder sb = new StringBuilder();

            for(int i = 1; i <= this.PageCount; i++)
            {
                if(i == this.CurrentPage)
                {
                    sb.AppendFormat("<OPTION value="{0}" selected>{0}</OPTION>", i);
                }
                else
                {
                    sb.AppendFormat("<OPTION value="{0}">{0}</OPTION>", i);
                }
            }

            return sb.ToString();
        }
        #endregion

        #region GetHTML
        private string GetHTML()
        {
            string[] links = this.GetPagerLinks();
            StringBuilder sb = new StringBuilder();
            sb.AppendFormat("<TABLE width="{0}%" height="{1}" cellpadding="{2}" cellspacing="{3}" class="{4}"><TR>", this.Width.Value, this.Height.Value, this.CellPadding, this.CellSpacing, this.TableCssClass);
            sb.AppendFormat("<TD align="left" width="100" class="{0}">", this.TableCellCssClass);
            sb.AppendFormat("<SPAN>共&nbsp;{0}&nbsp;条数据</SPAN>", this.RecordCount);
            sb.AppendFormat("</TD><TD align="center" class="{0}">", this.TableCellCssClass);
            sb.AppendFormat("<A class="{0}" href="{1}">{2}</A>&nbsp;", this.PagerCssClass, links[0], this.FirstPageText);
            sb.AppendFormat("<A class="{0}" href="{1}">{2}</A>&nbsp;", this.PagerCssClass, links[1], this.PrePageText);
            sb.AppendFormat("<A class="{0}" href="{1}">{2}</A>&nbsp;", this.PagerCssClass, links[2], this.NextPageText);
            sb.AppendFormat("<A class="{0}" href="{1}">{2}</A>&nbsp;", this.PagerCssClass, links[3], this.LastPageText);
            sb.AppendFormat("&nbsp;转到<SELECT onchange="window.location.href='{0}'+this.options[this.selectedIndex].value;">{1}</SELECT>页", links[4], this.GetPagerOptions());
            sb.AppendFormat("</TD><TD align="right" class="{0}">第&nbsp;{1}&nbsp;/&nbsp;{2}&nbsp;页</TD>", this.TableCellCssClass, this.CurrentPage, this.PageCount);
            sb.AppendFormat("</TR></TABLE>");
            return sb.ToString();
        }
        #endregion

        #region override Render
        protected override void Render(HtmlTextWriter writer)
        {
            writer.Write(this.GetHTML());
            base.Render (writer);
        }
        #endregion
    }
}