分页笔记
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using C2BUY.Community.Entity;
using System.Web.Routing;
namespace C2BUY.Community.Web.Core.UIHelper
{
public class PagerBuilder
{
private readonly HtmlHelper _html;
private readonly int _totalCount;
private readonly int _pageIndex;
private readonly int _pageSize;
private readonly int _limitMaxPages;
private readonly RouteValueDictionary _routeValues;
private readonly string _actionName;
private readonly string _controllerName;
private readonly string _routeName;
private readonly string _onSuccess;
private readonly string _updateTargetId;
public PagerBuilder(HtmlHelper html, int totalCount, int pageIndex, int pageSize, string actionName, string controllerName, string routeName, string updateTargetId, string onSuccess)
{
if (String.IsNullOrEmpty(actionName))
{
actionName = (string)html.ViewContext.RouteData.Values["action"];
}
if (String.IsNullOrEmpty(controllerName))
{
controllerName = (string)html.ViewContext.RouteData.Values["controller"];
}
_html = html;
_totalCount = totalCount;
_pageIndex = pageIndex;
_pageSize = pageSize;
_actionName = actionName;
_controllerName = controllerName;
_routeName = routeName;
_updateTargetId = updateTargetId;
_onSuccess = onSuccess;
}
public string RenderPager()
{
//当前页,前面和后面显示的页数
int showNum = 2;
//最前面和最后面显示的页数
int lastNum = 2;
string endHtml = "";
int pageIndex = _pageIndex;
int pageSize = _pageSize;
//总页数
int totalPage = (int)Math.Ceiling((double)((double)_totalCount / (double)_pageSize));
if (totalPage < 1) return "";
if (_limitMaxPages != 0)
{
if (totalPage > _limitMaxPages) totalPage = _limitMaxPages;
endHtml = string.Format(" 共{0}页", totalPage);
}
else
{
endHtml = string.Format(" {1}/{2} 共{0}条", _totalCount, pageIndex, totalPage);
}
if (pageIndex <= 0) pageIndex = 1;
if (pageIndex > totalPage) pageIndex = totalPage;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append("<div class=\"pager m_w\">");
int startNum = 0;
int endNum = 0;
startNum = pageSize * (pageIndex - 1) + 1;
if (totalPage == pageIndex)
{
endNum = _totalCount;
}
else
{
endNum = pageSize * pageIndex;
}
//前半部分
if (pageIndex > 1)
{
sb.Append(CreatePagerItem(pageIndex - 1, "上一页", _onSuccess));
}
if (pageIndex <= showNum + lastNum + 1)
{
for (int i = 1; i < pageIndex; i++)
{
sb.AppendFormat(CreatePagerItem(i, i.ToString(), _onSuccess));
}
}
else
{
for (int i = 1; i <= lastNum; i++)
{
sb.AppendFormat(CreatePagerItem(i, i.ToString(), _onSuccess));
}
sb.Append("…");
for (int i = pageIndex - showNum; i < pageIndex; i++)
{
sb.AppendFormat(CreatePagerItem(i, i.ToString(), _onSuccess));
}
}
//当前页
if (!(pageIndex == 1 && totalPage == 1)) sb.Append("<span>" + pageIndex.ToString() + "</span>");
//后半部分
for (int i = pageIndex + 1; i <= pageIndex + showNum && i <= totalPage; i++)
{
sb.Append(CreatePagerItem(i, i.ToString(), _onSuccess));
}
if (pageIndex + showNum + lastNum < totalPage)
{
sb.Append("…");
for (int i = totalPage - lastNum + 1; i <= totalPage; i++)
{
sb.Append(CreatePagerItem(i, i.ToString(), _onSuccess));
}
}
else
{
for (int i = pageIndex + showNum + 1; i <= totalPage; i++)
{
sb.Append(CreatePagerItem(i, i.ToString(), _onSuccess));
}
}
if (pageIndex < totalPage)
{
sb.Append(CreatePagerItem(pageIndex + 1, "下一页", _onSuccess));
}
sb.Append(endHtml);
sb.Append("</div>");
return sb.ToString();
}
private string CreatePagerItem(int pageIndex, string text, string OnSuccess)
{
string linkUrl = GenerateUrl(pageIndex);
if (string.IsNullOrEmpty(_updateTargetId))
{
return string.Format("<a href=\"{0}\">{1}</a>", linkUrl, text);
//return "<a href=\"" + GenerateUrl(pageIndex) + "\">" + text + "</a>";
}
if (string.IsNullOrEmpty(OnSuccess))
{
return string.Format("<a href=\"{0}\" page-ajax=\"true\" page-update=\"#{1}\">{2}</a>", linkUrl, _updateTargetId, text);
}
return string.Format("<a href=\"{0}\" page-ajax=\"true\" page-update=\"#{1}\" page-ajax-success=\"" + OnSuccess + "\">{2}</a>", linkUrl, _updateTargetId, text);
//return "<a page-ajax=\"true\" href=\"" + GenerateUrl(pageIndex) + "\" onclick=\"$('#" + _updateTargetId + "').load($(this).attr('href') #" + _updateTargetId + ");return false;\">" + text + "</a>";
}
private string CreatePagerItem(int pageIndex, string text)
{
return CreatePagerItem(pageIndex, text, null);
}
private string GenerateUrl(int pageIndex)
{
var routeValues = GetCurrentRouteValues(_html.ViewContext); // _routeValues??new RouteValueDictionary();
routeValues["pi"] = pageIndex;
UrlHelper urlHelper = new UrlHelper(_html.ViewContext.RequestContext);
if (!string.IsNullOrEmpty(_routeName))
return urlHelper.RouteUrl(_routeName, routeValues);
return urlHelper.RouteUrl(routeValues);
}
private RouteValueDictionary GetCurrentRouteValues(ViewContext viewContext)
{
var routeValues = _routeValues ?? new RouteValueDictionary();
var rq = viewContext.HttpContext.Request.QueryString;
if (rq != null && rq.Count > 0)
{
var invalidParams = new[] { "x-requested-with", "xmlhttprequest", "pi" };
foreach (string key in rq.Keys)
{
// 添加url参数到路由中
if (!string.IsNullOrEmpty(key) && Array.IndexOf(invalidParams, key.ToLower()) < 0)
{
routeValues[key] = rq[key];
}
}
}
// action
routeValues["action"] = _actionName;
// controller
routeValues["controller"] = _controllerName;
return routeValues;
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using C2BUY.Community.Entity;
namespace C2BUY.Community.Web.Core.UIHelper
{
public static class PagerHelper
{
/// <summary>
/// 生成URL分页效果
/// </summary>
/// <param name="html"></param>
/// <param name="pagedList">PagedList实体对象</param>
/// <returns></returns>
public static MvcHtmlString Pager(this HtmlHelper html, IPagedList pagedList)
{
PagerBuilder pager = new PagerBuilder(html, pagedList.TotalCount, pagedList.PageIndex, pagedList.PageSize, null, null, null, null, null);
return MvcHtmlString.Create(pager.RenderPager());
}
/// <summary>
/// 生成URL分页效果(重新指定Action和Controller)
/// </summary>
/// <param name="html"></param>
/// <param name="pagedList">PagedList实体对象</param>
/// <param name="actionName">Action名称</param>
/// <param name="controllerName">Controller名称</param>
/// <returns></returns>
public static MvcHtmlString Pager(this HtmlHelper html, IPagedList pagedList, string actionName, string controllerName)
{
PagerBuilder pager = new PagerBuilder(html, pagedList.TotalCount, pagedList.PageIndex, pagedList.PageSize, actionName, controllerName, null, null, null);
return MvcHtmlString.Create(pager.RenderPager());
}
/// <summary>
/// 生成Ajax分页效果(重新指定Action和Controller)
/// </summary>
/// <param name="html"></param>
/// <param name="pagedList">PagedList实体对象</param>
/// <param name="actionName">Action名称</param>
/// <param name="controllerName">Controller名称</param>
/// <param name="updateTargetId">需要更新部分的ID</param>
/// <param name="onSuccess">更新完成后执行的回调函数</param>
/// <returns></returns>
public static MvcHtmlString AjaxPager(this HtmlHelper html, IPagedList pagedList, string actionName, string controllerName, string updateTargetId, string onSuccess)
{
PagerBuilder pager = new PagerBuilder(html, pagedList.TotalCount, pagedList.PageIndex, pagedList.PageSize, actionName, controllerName, null, updateTargetId, onSuccess);
return MvcHtmlString.Create(pager.RenderPager());
}
/// <summary>
/// 生成Ajax分页效果(重新指定Action和Controller)
/// </summary>
/// <param name="html"></param>
/// <param name="pagedList">PagedList实体对象</param>
/// <param name="actionName">Action名称</param>
/// <param name="controllerName">Controller名称</param>
/// <param name="updateTargetId">需要更新部分的ID</param>
/// <returns></returns>
public static MvcHtmlString AjaxPager(this HtmlHelper html, IPagedList pagedList, string actionName, string controllerName, string updateTargetId)
{
return AjaxPager(html, pagedList, actionName, controllerName, updateTargetId, null);
}
/// <summary>
/// 生成Ajax分页效果
/// </summary>
/// <param name="html"></param>
/// <param name="pagedList">PagedList实体对象</param>
/// <param name="updateTargetId">需要更新部分的ID</param>
/// <param name="onSuccess">更新完成后执行的回调函数</param>
/// <returns></returns>
public static MvcHtmlString AjaxPager(this HtmlHelper html, IPagedList pagedList, string updateTargetId, string onSuccess)
{
PagerBuilder pager = new PagerBuilder(html, pagedList.TotalCount, pagedList.PageIndex, pagedList.PageSize, null, null, null, updateTargetId, onSuccess);
return MvcHtmlString.Create(pager.RenderPager());
}
/// <summary>
/// 生成Ajax分页效果
/// </summary>
/// <param name="html"></param>
/// <param name="pagedList">PagedList实体对象</param>
/// <param name="updateTargetId">需要更新部分的ID</param>
/// <returns></returns>
public static MvcHtmlString AjaxPager(this HtmlHelper html, IPagedList pagedList, string updateTargetId)
{
return AjaxPager(html, pagedList, updateTargetId, null);
}
}
}
