/// <summary>
/// 创建分页导航
/// </summary>
/// <param name="currentPage">当前页</param>
/// <param name="totalPageCount">总页数</param>
/// <param name="apo">ajax分页参数</param>
/// <param name="ajaxHelper">ajax帮助类</param>
/// <param name="rvd">路由参数</param>
/// <returns>分页导航HTML内容</returns>
private static MvcHtmlString CreateBootstrapPagerNav(int currentPage, int totalPageCount, AjaxPagerStyleOptions apso, AjaxPagerOptions apo, AjaxHelper ajaxHelper, RouteValueDictionary rvd, Func <int, AjaxOptions> aoFunc)
{
UrlHelper urlHelper = new UrlHelper(ajaxHelper.ViewContext.RequestContext);
string voidStr = "javascript:void(0)";
if (apso == null)
{
apso = new AjaxPagerStyleOptions()
{
PaginationStyle = BootstrapPaginationStyleEnum.Middle,
NavShowCount = 10
};
}
#region 外层
TagBuilder nav = new TagBuilder("nav");
TagBuilder ul = new TagBuilder("ul");
ul.AddCssClass("pagination");
if (apso.PaginationStyle == BootstrapPaginationStyleEnum.Small)
{
ul.AddCssClass("pagination-sm");
}
else if (apso.PaginationStyle == BootstrapPaginationStyleEnum.Large)
{
ul.AddCssClass("pagination-lg");
}
#endregion
#region 首页
TagBuilder first = new TagBuilder("li");
TagBuilder firstLink = new TagBuilder("a");
firstLink.SetInnerText(HttpUtility.HtmlDecode("«"));
firstLink.MergeAttribute("href", voidStr);
if (totalPageCount == 1 || currentPage == 1)//只有一页数据或者当前就是第一页的话，那么禁用返回第一页的按钮
{
first.AddCssClass("disabled");
}
else
{
if (aoFunc != null)
{
firstLink.MergeAttributes(aoFunc(1).ToUnobtrusiveHtmlAttributes());
}
else
{
apo.Url = urlHelper.Action(apo.ActionName, apo.ControllerName, rvd);
firstLink.MergeAttributes(apo.ToUnobtrusiveHtmlAttributes());
}
}
first.InnerHtml = firstLink.ToString();
#endregion
#region 末页
TagBuilder last = new TagBuilder("li");
TagBuilder lastLink = new TagBuilder("a");
lastLink.SetInnerText(HttpUtility.HtmlDecode("»"));
lastLink.MergeAttribute("href", voidStr);
if (totalPageCount == 1 || currentPage == totalPageCount)//只有一页数据或者当前已经是最后一页的话，那么禁用最后一页的按钮
{
last.AddCssClass("disabled");
}
else
{
if (aoFunc != null)
{
lastLink.MergeAttributes(aoFunc(totalPageCount).ToUnobtrusiveHtmlAttributes());
}
else
{
rvd[apo.SearchPageFieldName] = totalPageCount;
apo.Url = urlHelper.Action(apo.ActionName, apo.ControllerName, rvd);
lastLink.MergeAttributes(apo.ToUnobtrusiveHtmlAttributes());
}
}
last.InnerHtml = lastLink.ToString();
#endregion
#region 中间页码
//假设一共有22页
//分页导航条一次最多显示多少页
int navMaxCount = apso.NavShowCount <= 2 ? 10 : apso.NavShowCount;
if (totalPageCount < navMaxCount)
{
navMaxCount = totalPageCount;
}
//中间值 （用于生成每个区段的中间值，区段中间值用于计算点击页码后生成的开始页码和结束页码）
//中间参考值为5
int midFlag = (int)Math.Ceiling(navMaxCount * 1.0 / 2);
//计算区段 比如每次10页的话 那么应该是3个区段 1-10 11-20 21-30
int blockCount = totalPageCount / navMaxCount;
if (totalPageCount % navMaxCount != 0)//无法被整除，区块增加1个
{
blockCount++;
}
List <BlockParam> blockParams = new List <BlockParam>();
for (int i = 1; i <= blockCount; i++)
{
/**
* 第一个区段中间位置参考值 (1-1)*10+5 5
* 第二个区段中间位置参考值 (2-1)*10+5 15
* 以此类推
*/
int middleValue = (i - 1) * navMaxCount + midFlag;
/**
* 第一个区段开始位置参考值 10*(1-1)+1 1
* 第二个区段开始位置参考值 10*(2-1)+1 11
* 以此类推
*/
int startValue = navMaxCount * (i - 1) + 1;
/**
* 第一个区段结束位置参考值 10
* 第二个区段结束位置参考值 20
* 以此类推
*/
int endValue = navMaxCount * i;
blockParams.Add(new BlockParam()
{
EndNum = endValue,
MiddleNum = middleValue,
StartNum = startValue
});
}
int startPage = 0; //开始页码
int endPage = 0; //结束页码
if (currentPage == 1) //当前页是第一页
{
//如果当前页是第一页，那么生成的分页导航开始页码就是1，结束页码是总页数或分页导航单次最大页数
startPage = 1;
//endPage = totalPageCount < navMaxCount ? totalPageCount : navMaxCount;
endPage = navMaxCount;
}
else if (currentPage == totalPageCount)//最后一页
{
//结束页码就是当前页码，开始页码是当前页码-导航最大页码+1
endPage = currentPage;
startPage = currentPage - navMaxCount + 1;
}
else
{
#region 中间某一页
//中间的某一页
int blockIndex = currentPage / navMaxCount;//获取区段索引
var currentBlock = blockParams[blockIndex];
startPage = currentBlock.StartNum;
endPage = currentBlock.EndNum;
int currentBlockMidVal = currentBlock.MiddleNum;
if (currentPage <= currentBlockMidVal)
{
#region 小于等于中间值
int offset = Math.Abs(currentPage - currentBlockMidVal);
int newEnd = endPage - offset;
if (newEnd > totalPageCount)
{
endPage = totalPageCount;
startPage = totalPageCount - navMaxCount + 1;
}
//特殊情况：比如导航要显示10页，点了第2页，并且总页数是大于等于导航页数的，当计算出来的结束页码小于应该显示的页数时，
//结束页应该是导航页码的最大值，而不是根据偏移量算出来的值
else if (newEnd < navMaxCount && totalPageCount >= navMaxCount)
{
endPage = navMaxCount;
startPage = 1;
}
else
{
startPage -= offset;
endPage -= offset;
}
#endregion
}
else
{
#region 大于中间值
int offset = Math.Abs(currentPage - currentBlockMidVal);
int newEnd = endPage + offset;
if (newEnd > totalPageCount)
{
endPage = totalPageCount;
startPage = totalPageCount - navMaxCount + 1;
}
else
{
startPage += offset;
endPage += offset;
}
#endregion
}
#endregion
}
#region 生成
//修正页码
if (startPage <= 0)
{
startPage = 1;
}
if (endPage > totalPageCount)
{
endPage = totalPageCount;
}
string contentStr = string.Empty;
for (int i = startPage; i <= endPage; i++)
{
TagBuilder numLI = new TagBuilder("li");
TagBuilder numLink = new TagBuilder("a");
numLink.MergeAttribute("href", voidStr);
if (i == currentPage)//当前页添加 css
{
numLI.AddCssClass("active");
}
if (totalPageCount != 1)//如果总页数超过1，那么才对 页链接创建非注入式脚本，否则不添加
{
if (aoFunc != null)
{
numLink.MergeAttributes(aoFunc(i).ToUnobtrusiveHtmlAttributes());
}
else
{
rvd[apo.SearchPageFieldName] = i;
apo.Url = urlHelper.Action(apo.ActionName, apo.ControllerName, rvd);
numLink.MergeAttributes(apo.ToUnobtrusiveHtmlAttributes());
}
}
numLink.SetInnerText(i.ToString());
numLI.InnerHtml = numLink.ToString();
contentStr += numLI.ToString();
}
#endregion
#endregion
//合并
ul.InnerHtml += first.ToString() + contentStr + last.ToString();
nav.InnerHtml = ul.ToString();
return(MvcHtmlString.Create(nav.ToString()));
}
/// <summary>
/// <para>生成Ajax分页导航</para>
/// <para>用于SearchDataWithPagedDatas模型</para>
/// </summary>
/// <typeparam name="TSearchModel">包含查询条件字段的类型</typeparam>
/// <typeparam name="TPagedModel">分页数据对应的类型</typeparam>
/// <param name="ajaxHelper"></param>
/// <param name="apo">Ajax分页选项</param>
/// <param name="apso">Ajax分页样式选项</param>
/// <returns></returns>
public static MvcHtmlString AsiatekAjaxPagerBootstrap <TSearchModel, TPagedModel>(this AjaxHelper <SearchDataWithPagedDatas <TSearchModel, TPagedModel> > ajaxHelper, AjaxPagerOptions apo, AjaxPagerStyleOptions apso = null)
{
var searchDataWithPagedDatas = ajaxHelper.ViewData.Model;
apo.SearchPageFieldName = "SearchPage";
#region 配置路由参数值
//反射查询参数对象，将系统类型的属性值添加到路由参数值中，属性名是路由参数的key
//之所以这样做，是因为对于分页查询所需要的参数肯定都是简单类型
//比如视图采用模型StudentSetting，StudentSetting包含下拉列表Grades年级，以及对应的值GradeID
//对于我们的查询而言，需要的只是GradeID，而不是Grades下拉列表属性
Type type = searchDataWithPagedDatas.SearchModel.GetType();
//var props = type.GetProperties().Where(p => p.PropertyType.ToString().StartsWith("System.") && !p.PropertyType.IsGenericType);
//必须使用Nullable.GetUnderlyingType获取可空类型的基础类型，否者如int？类型的IsGenericType是true，因为本质是Nullable<T>类型
var props = type.GetProperties().Where(p =>
{
Type safeType = Nullable.GetUnderlyingType(p.PropertyType) ?? p.PropertyType;
return(safeType.ToString().StartsWith("System.") && !safeType.IsGenericType);
});
RouteValueDictionary rvd = new RouteValueDictionary();
foreach (PropertyInfo p in props)
{
rvd.Add(p.Name, p.GetValue(searchDataWithPagedDatas.SearchModel, null));
}
rvd.Add(apo.SearchPageFieldName, 1);
//查询操作所属区域名
rvd.Add("area", apo.AreaName);
#endregion
int pageIndex = searchDataWithPagedDatas.PagedDatas.CurrentPageIndex; //当前页索引
int pageCount = searchDataWithPagedDatas.PagedDatas.TotalPageCount; //总页数
return(CreateBootstrapPagerNav(pageIndex, pageCount, apso, apo, ajaxHelper, rvd, null));
}
/// <summary>
/// <para>生成Ajax分页导航</para>
/// </summary>
/// <typeparam name="T">包含分页数据与分页查询条件的类型</typeparam>
/// <param name="ajaxHelper"></param>
/// <param name="pageList">分页结果</param>
/// <param name="apo">Ajax分页选项</param>
/// <param name="apso">Ajax分页样式选项</param>
/// <returns></returns>
public static MvcHtmlString AsiatekAjaxPagerBootstrap <T>(this AjaxHelper <T> ajaxHelper, IAsiatekPagedList pageList, AjaxPagerOptions apo, AjaxPagerStyleOptions apso = null)
{
#region 配置路由参数值
//反射查询参数对象，将系统类型的属性值添加到路由参数值中，属性名是路由参数的key
//之所以这样做，是因为对于分页查询所需要的参数肯定都是简单类型
//比如视图采用模型StudentSetting，StudentSetting包含下拉列表Grades年级，以及对应的值GradeID
//对于我们的查询而言，需要的只是GradeID，而不是Grades下拉列表属性
var model = ajaxHelper.ViewData.Model;
Type type = model.GetType();
//必须使用Nullable.GetUnderlyingType获取可空类型的基础类型，否者如int？类型的IsGenericType是true，因为本质是Nullable<T>类型
var props = type.GetProperties().Where(p =>
{
Type safeType = Nullable.GetUnderlyingType(p.PropertyType) ?? p.PropertyType;
return(safeType.ToString().StartsWith("System.") && !safeType.IsGenericType);
});
RouteValueDictionary rvd = new RouteValueDictionary();
foreach (PropertyInfo p in props)
{
rvd.Add(p.Name, p.GetValue(model, null));
}
if (string.IsNullOrEmpty(apo.SearchPageFieldName))
{
apo.SearchPageFieldName = "SearchPage";
}
if (!rvd.ContainsKey(apo.SearchPageFieldName))
{
//允许自定义分页查询 当前页字段名
//相当于往请求参数中附加了SearchPage=1
rvd.Add(apo.SearchPageFieldName, 1);
}
else
{
rvd[apo.SearchPageFieldName] = 1;
}
//查询操作所属区域名
rvd.Add("area", apo.AreaName);
#endregion
return(CreateBootstrapPagerNav(pageList.CurrentPageIndex, pageList.TotalPageCount, apso, apo, ajaxHelper, rvd, null));
}
/// <summary>
/// 生成Ajax分页导航
/// </summary>
/// <param name="ajaxHelper"></param>
/// <param name="currentPage">当前页码</param>
/// <param name="totalPageCount">总页数</param>
/// <param name="ajaxOptionsFunc">返回AjaxOptions类型的方法</param>
/// <param name="apso">Ajax分页样式选项</param>
/// <returns></returns>
public static MvcHtmlString AsiatekAjaxPagerBootstrap(this AjaxHelper ajaxHelper, int currentPage, int totalPageCount, Func <int, AjaxOptions> ajaxOptionsFunc, AjaxPagerStyleOptions apso = null)
{
return(CreateBootstrapPagerNav(currentPage, totalPageCount, apso, null, ajaxHelper, null, ajaxOptionsFunc));
}