对于数据分页，我们已经见的太多了，几乎每个列表页面都要用到分页，这已经成了一种定理了，在进行大数据展示时，如果不去分页，而直接把数据加载到内存，这简直是不可以去相向的，呵呵，在很多ORM工具中都对分页有了更好的支持，如LINQ里有大家熟悉的take和skip，而在MongoDB里也有这种概念，它使用limit和skip实现，这在大多数的Mongo客户端上都集成了这个功能，即帮助我们组合命令参数，并带我们把分页取数据的指令发到Mongo服务器去，实现分页技术！
添加了分页后的IMongoRepository接口
/// <summary>
/// MongoDB集成的查询方法，大数据情况下，有分页时使用这个方法
/// </summary>
/// <typeparam name="U">匿名对象，用来为条件赋值</typeparam>
/// <param name="template">条件对象</param>
/// <param name="limit"></param>
/// <param name="skip"></param>
/// <returns></returns>
PagedResult<TEntity> GetModel<U>(U template, int pageIndex, int pageSize);
/// <summary>
/// MongoDB集成的查询方法，大数据情况下，有分页和排序时使用这个方法
/// </summary>
/// <typeparam name="U">匿名对象，用来为条件赋值</typeparam>
/// <typeparam name="O">匿名对象，用来为排序赋值，NoRM.OrderBy枚举</typeparam>
/// <param name="template">条件对象</param>
/// <param name="orderby">排序对象</param>
/// <param name="limit"></param>
/// <param name="skip"></param>
/// <returns></returns>
PagedResult<TEntity> GetModel<U, O>(U template, O orderby, int pageIndex, int pageSize);
看我是如何去实现它的，事实上是调用了Mongo客户端封装的Find<T, U, O>(this IMongoCollection<T> collection, U template, O orderby, int limit, int skip);方法
实现的，我们来看一下代码
public PagedResult<TEntity> GetModel<U, O>(U template, O orderby, int pageIndex, int pageSize)
{
var skip = (pageIndex - ) * pageSize;
var limit = pageSize;
var recordCount = _table.Count();
return new PagedResult<TEntity>(
recordCount,
(int)(recordCount + pageSize - ) / pageSize,
pageSize,
pageIndex,
_table.Find(template, orderby, limit, skip).ToList());
}
代码主要实现的是分页和排序功能，其中template是查询条件，可以传入一个匿名对象，而orderby参数表示一个排序的匿名对象，把排序字段写到对象里即可，升序为1，降
序为-1，也可以使用它定义好的枚举来赋值，下面我们为上面方法做一个重载，来针对不需要排序的需求
public PagedResult<TEntity> GetModel<U>(U template, int pageIndex, int pageSize)
{
return GetModel(template, new { }, pageIndex, pageSize);
}
有了底层的方法，再来看它的返回值，如果是分页返回对象，那么一定要返回一个PagedResult泛型对象，这个对象主要向外部公开一个参数，如当前页的数据集，当前页号
每面显示记录数，总页数和总的记录数及URL条件集合等。
/// <summary>
/// 分页结果对象，UI显示它，BLL为它赋值
/// 陈晴阳开发，张占岭修改，添加了AddParameters属性，用来存储URL参数
/// </summary>
/// <typeparam name="T"></typeparam>
public class PagedResult<T> : IEnumerable<T>, ICollection<T>
{
#region Public Fields
/// <summary>
/// 获取一个当前类型的空值。
/// </summary>
public static readonly PagedResult<T> Empty = new PagedResult<T>(, , , , null);
#endregion #region Ctor
/// <summary>
/// 初始化一个新的<c>PagedResult{T}</c>类型的实例。
/// </summary>
public PagedResult()
{
Data = new List<T>();
AddParameters = new NameValueCollection();
PageSize = ;
}
/// <summary>
/// 初始化一个新的<c>PagedResult{T}</c>类型的实例。
/// </summary>
/// <param name="totalRecords">总记录数。</param>
/// <param name="totalPages">页数。</param>
/// <param name="pageSize">页面大小。</param>
/// <param name="pageNumber">页码。</param>
/// <param name="data">当前页面的数据。</param>
public PagedResult(long totalRecords, int totalPages, int pageSize, int pageNumber, List<T> data)
{
this.TotalPages = totalPages;
this.TotalRecords = totalRecords;
this.PageSize = pageSize;
this.PageIndex = pageNumber;
this.Data = data;
}
#endregion #region Public Properties
/// <summary>
/// 获取或设置总记录数。
/// </summary>
public long TotalRecords { get; set; }
/// <summary>
/// 获取或设置页数。
/// </summary>
public int TotalPages { get; set; }
/// <summary>
/// 获取或设置页面大小。
/// </summary>
public int PageSize { get; set; }
/// <summary>
/// 获取或设置页码。
/// </summary>
public int PageIndex { get; set; }
/// <summary>
/// 获取或设置当前页面的数据。
/// </summary>
public List<T> Data { get; set; }
/// <summary>
/// 分页参数
/// </summary>
public NameValueCollection AddParameters { get; set; }
#endregion #region Public Methods
/// <summary>
/// 确定指定的Object是否等于当前的Object。
/// </summary>
/// <param name="obj">要与当前对象进行比较的对象。</param>
/// <returns>如果指定的Object与当前Object相等，则返回true，否则返回false。</returns>
/// <remarks>有关此函数的更多信息，请参见：http://msdn.microsoft.com/zh-cn/library/system.object.equals。
/// </remarks>
public override bool Equals(object obj)
{
if (ReferenceEquals(this, obj))
return true;
if (obj == (object)null)
return false;
var other = obj as PagedResult<T>;
if (other == (object)null)
return false;
return this.TotalPages == other.TotalPages &&
this.TotalRecords == other.TotalRecords &&
this.PageIndex == other.PageIndex &&
this.PageSize == other.PageSize &&
this.Data == other.Data;
} /// <summary>
/// 用作特定类型的哈希函数。
/// </summary>
/// <returns>当前Object的哈希代码。</returns>
/// <remarks>有关此函数的更多信息，请参见：http://msdn.microsoft.com/zh-cn/library/system.object.gethashcode。
/// </remarks>
public override int GetHashCode()
{
return this.TotalPages.GetHashCode() ^
this.TotalRecords.GetHashCode() ^
this.PageIndex.GetHashCode() ^
this.PageSize.GetHashCode();
} /// <summary>
/// 确定两个对象是否相等。
/// </summary>
/// <param name="a">待确定的第一个对象。</param>
/// <param name="b">待确定的另一个对象。</param>
/// <returns>如果两者相等，则返回true，否则返回false。</returns>
public static bool operator ==(PagedResult<T> a, PagedResult<T> b)
{
if (ReferenceEquals(a, b))
return true;
if ((object)a == null || (object)b == null)
return false;
return a.Equals(b);
} /// <summary>
/// 确定两个对象是否不相等。
/// </summary>
/// <param name="a">待确定的第一个对象。</param>
/// <param name="b">待确定的另一个对象。</param>
/// <returns>如果两者不相等，则返回true，否则返回false。</returns>
public static bool operator !=(PagedResult<T> a, PagedResult<T> b)
{
return !(a == b);
}
#endregion #region IEnumerable<T> Members
/// <summary>
/// 返回一个循环访问集合的枚举数。
/// </summary>
/// <returns>一个可用于循环访问集合的 IEnumerator 对象。</returns>
public IEnumerator<T> GetEnumerator()
{
return Data.GetEnumerator();
} #endregion #region IEnumerable Members
/// <summary>
/// 返回一个循环访问集合的枚举数。 （继承自 IEnumerable。）
/// </summary>
/// <returns>一个可用于循环访问集合的 IEnumerator 对象。</returns>
IEnumerator IEnumerable.GetEnumerator()
{
return Data.GetEnumerator();
} #endregion #region ICollection<T> Members
/// <summary>
/// 将某项添加到 ICollection{T} 中。
/// </summary>
/// <param name="item">要添加到 ICollection{T} 的对象。</param>
public void Add(T item)
{
Data.Add(item);
} /// <summary>
/// 从 ICollection{T} 中移除所有项。
/// </summary>
public void Clear()
{
Data.Clear();
} /// <summary>
/// 确定 ICollection{T} 是否包含特定值。
/// </summary>
/// <param name="item">要在 ICollection{T} 中定位的对象。</param>
/// <returns>如果在 ICollection{T} 中找到 item，则为 true；否则为 false。</returns>
public bool Contains(T item)
{
return Data.Contains(item);
} /// <summary>
/// 从特定的 Array 索引开始，将 ICollection{T} 的元素复制到一个 Array 中。
/// </summary>
/// <param name="array">作为从 ICollection{T} 复制的元素的目标的一维 Array。 Array 必须具有从零开始的索引。</param>
/// <param name="arrayIndex">array 中从零开始的索引，从此索引处开始进行复制。</param>
public void CopyTo(T[] array, int arrayIndex)
{
Data.CopyTo(array, arrayIndex);
} /// <summary>
/// 获取 ICollection{T} 中包含的元素数。
/// </summary>
public int Count
{
get { return Data.Count; }
} /// <summary>
/// 获取一个值，该值指示 ICollection{T} 是否为只读。
/// </summary>
public bool IsReadOnly
{
get { return false; }
} /// <summary>
/// 从 ICollection{T} 中移除特定对象的第一个匹配项。
/// </summary>
/// <param name="item">要从 ICollection{T} 中移除的对象。</param>
/// <returns>如果已从 ICollection{T} 中成功移除 item，则为 true；否则为 false。 如果在原始 ICollection{T} 中没有找到 item，该方法也会返回 false。 </returns>
public bool Remove(T item)
{
return Data.Remove(item);
} #endregion
}
有了底层方法和返回的对象，下面就是前台显示了，我们可以扩展一个PagerHelper，重新为它起个名字叫PagedResultHelper吧，把它的相关PagedList类型对象修改成PagedResult对象即可，代码如下
/// <summary>
/// 关于PagedResult对象的分页展示
/// 作者：张占岭，花名：仓储大叔
/// </summary>
public static class PagedResultHelper
{ #region Ajax分页
/// <summary>
/// AJAX分页
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="html"></param>
/// <param name="pagedList"></param>
/// <param name="UpdateTargetId"></param>
/// <returns></returns>
public static MvcHtmlString AjaxPagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList, string UpdateTargetId, bool isDisplayCompletePage)
{
var ui = new UIHelper(html.ViewContext.RequestContext.HttpContext.Request.Url.ToString(), UpdateTargetId, pagedList.AddParameters);
if (!isDisplayCompletePage)
return MvcHtmlString.Create(ui.GetPage(pagedList.PageIndex, pagedList.PageSize, (int)pagedList.TotalRecords, false));
else
return MvcHtmlString.Create(ui.GetPage(pagedList.PageIndex, pagedList.PageSize, (int)pagedList.TotalRecords));
} public static MvcHtmlString AjaxPager<T>(this HtmlHelper html, PagedResult<T> pagedList, string UpdateTargetId)
{
return AjaxPagerResult<T>(html, pagedList, UpdateTargetId, true);
}
/// <summary>
/// AJAX分页
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="html"></param>
/// <param name="pagedList"></param>
/// <param name="UpdateTargetId"></param>
/// <param name="ActionName"></param>
/// <param name="ControllerName"></param>
/// <returns></returns>
public static MvcHtmlString AjaxPagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList, string UpdateTargetId, string ActionName, string ControllerName, bool isDisplayCompletePage, bool isTop)
{
var mvcUrl = new UrlHelper(html.ViewContext.RequestContext).Action(ActionName, ControllerName); //占岭修改
var localUrl = string.Format(@"{0}://{1}", html.ViewContext.RequestContext.HttpContext.Request.Url.Scheme, html.ViewContext.RequestContext.HttpContext.Request.Url.Authority);
var url = string.Format("{0}{1}{2}", localUrl, mvcUrl, html.ViewContext.RequestContext.HttpContext.Request.Url.Query);
var ui = new UIHelper(url, UpdateTargetId, pagedList.AddParameters);
return MvcHtmlString.Create(ui.GetPage(pagedList.PageIndex, pagedList.PageSize, (int)pagedList.TotalRecords, isDisplayCompletePage, false, isTop));
}
public static MvcHtmlString AjaxPagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList, string UpdateTargetId, string ActionName, string ControllerName, bool isDisplayCompletePage)
{
return AjaxPagerResult<T>(html, pagedList, UpdateTargetId, ActionName, ControllerName, true, false);
}
/// <summary>
/// ajax方式，MVC路由支持的分页
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="html"></param>
/// <param name="pagedList"></param>
/// <param name="UpdateTargetId"></param>
/// <param name="ActionName"></param>
/// <param name="ControllerName"></param>
/// <returns></returns>
public static MvcHtmlString AjaxPagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList, string UpdateTargetId, string ActionName, string ControllerName)
{
var mvcUrl = new UrlHelper(html.ViewContext.RequestContext).Action(ActionName, ControllerName); //占岭修改
var localUrl = string.Format(@"{0}://{1}", html.ViewContext.RequestContext.HttpContext.Request.Url.Scheme, html.ViewContext.RequestContext.HttpContext.Request.Url.Authority);
var url = string.Format("{0}{1}{2}", localUrl, mvcUrl, html.ViewContext.RequestContext.HttpContext.Request.Url.Query);
var ui = new UIHelper(url, UpdateTargetId, pagedList.AddParameters); return MvcHtmlString.Create(ui.GetPage(pagedList.PageIndex
, pagedList.PageSize
, (int)pagedList.TotalRecords
,
, new UrlHelper(html.ViewContext.RequestContext)
, html.ViewContext.RouteData.Values["action"].ToString()
, html.ViewContext.RouteData.Values["controller"].ToString(), true, false, null)); } #endregion #region Html分页
/// <summary>
/// Html分页,不使用MVC路由
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="html"></param>
/// <param name="pagedList"></param>
/// <returns></returns>
public static MvcHtmlString PagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList)
{
return PagerResult<T>(html, pagedList, false);
}
public static MvcHtmlString PagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList, string className)
{
return PagerResult<T>(html, pagedList, false, className);
}
public static MvcHtmlString PagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList, bool router, string className)
{
return PagerResult<T>(html, pagedList, router, true, className);
}
/// <summary>
/// Html分页，router为true表示走MVC路由
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="html"></param>
/// <param name="pagedList"></param>
/// <param name="router">路由</param>
/// <param name="className">ＣＳＳ类名</param>
/// <returns></returns>
public static MvcHtmlString PagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList, bool router, bool isCompleteDisplay, string className)
{
if (pagedList == null)
return null;
UIHelper ui = new UIHelper(html.ViewContext.RequestContext.HttpContext.Request.Url.ToString(), pagedList.AddParameters);
if (router)
return MvcHtmlString.Create(ui.GetPage(pagedList.PageIndex
, pagedList.PageSize
, (int)pagedList.TotalRecords
,
, new UrlHelper(html.ViewContext.RequestContext)
, html.ViewContext.RouteData.Values["action"].ToString()
, html.ViewContext.RouteData.Values["controller"].ToString(), isCompleteDisplay, false, className));
return MvcHtmlString.Create(ui.GetPage(pagedList.PageIndex, pagedList.PageSize, (int)pagedList.TotalRecords, isCompleteDisplay, className));
}
public static MvcHtmlString PagerResult<T>(this HtmlHelper html, PagedResult<T> pagedList, bool router)
{
return PagerResult<T>(html, pagedList, router, null);
}
#endregion }
这样，我们前台调用分页时，还是一句话就搞定了，呵呵！
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事实上，对于PagedResult我们也可以用在其它ORM工具上，因为一定的数据库和NoSql都开放了limit及skip等功能，大家可以放眼去看，放心去想，呵呵！