浅谈MVC3自定义分页
分页这个东西刚开始自己来写的时候感觉很复杂，在网络上分页大部分都是比较成熟分页空间，对于新手的我查看其代码有时真的看的不太明白，最近自己在用到MVC3做分页查看数据，有些总结
1、分页基本参数：pageSize、pageIndex、Total
其中Total，这个也就是要查询数据的总个数，到时用来生成分页控件
2、Controll 部分
public ActionResult Paging(int? pageIndex, int pageSize = 5)
{
int total = 0;
pageIndex = pageIndex == null ? 0 : pageIndex;
//获取数据
MercuryDbExEntities db = new MercuryDbExEntities();
total = db.Users.Count();
var result = db.Users.OrderBy(p => p.Id).Skip(pageIndex.Value * pageSize).Take(pageSize);
ViewBag.Pagination = new Pagination(pageIndex, pageSize, total);
return View(result);
}
3、
public class Pagination
{
public int? PageIndex { get; private set; }//当前页号减一的值
public int PageSize { get; private set; } //每页显示的内容数量
public int TotalPages { get; private set; }//总页数
public int Start { get; private set; }//当前页面，显示的第一个页号（比如在中间的页面，页号显示是9号到16号，9就是Start）
public int End { get; private set; }//当前页面，显示的最后一个页号
public Pagination(int? pageIndex, int pageSize, int totalcount)
{
PageIndex = (pageIndex ?? 0);
PageSize = pageSize; ;
TotalPages = (int)Math.Ceiling(totalcount / (double)PageSize);
int size;//判定每个页面显示多少个页号
if (TotalPages > 6)//这里规定每个页面显示6个页号
{
size = 6;
//定义每个页面的页号从几开始
if (pageIndex > 2 && pageIndex < TotalPages - (size - 2))
{
Start = (pageIndex ?? 0) - 1;
}
else if (pageIndex >= TotalPages - (size - 2))
{
Start = TotalPages - size + 1;
}
else
{
Start = 1;
}
}
else
{
size = TotalPages;
Start = 1;
}
End = Start + size - 1;
}
// 为“上一页”“下一页”导航备用
public bool HasPreviousPage
{
get { return (PageIndex > 0); }
}
public bool HasNextPage
{
get { return (PageIndex + 1 < TotalPages); }
}
}
4、View部分
--内容展示部分
@model IEnumerable<Mvc3_Test.DataBase.Users>
@using Mvc3_Test.Htmlhelpers
@{
ViewBag.Title = "Paging";
}
<h2>内容展示</h2>
@foreach (var item in Model)
{
<p>
@item.Id <b>|</b>@item.LoginName
</p>
}
<hr />
@Html.Partial("_Pagination", (Mvc3_Test.Htmlhelpers.Pagination)ViewBag.Pagination)
--分页标签展示部分
@model Mvc3_Test.Htmlhelpers.Pagination
@using Mvc3_Test.Htmlhelpers
<div class="clearfix pagination">
<div class="pagination-inner">
@if (Model.Start > 1)
{
//如果当前页面超过第二页则显示第一页“1...”的链接
string url = Html.UrlSet(Request, "pageIndex", 0);
<a title="第一页1..." href="@url">1...</a>
}
@for (int i = Model.Start; i <= Model.End; i++)
{
string url = Html.UrlSet(Request, "pageIndex", i - 1);
if (i == Model.PageIndex + 1)
{
//在当前页面的几个页号中寻找当前页号
<a title="当前第 @i.ToString() 页" class="current" href="@url">@i.ToString()</a>
}
else
{
<a title="前往第 @i.ToString() 页@i.ToString()" href="@url">@i.ToString()</a>
}
}
@if (Model.End < Model.TotalPages && Model.PageIndex - Model.Start < 2)
{
//最后一页
string totalPages = (@Model.TotalPages).ToString();
string url = Html.UrlSet(Request, "pageIndex", Model.TotalPages - 1);
<a title="最后一页@totalPages" href="@url">@totalPages</a>
}
</div>
</div>
【说明：其中大家看到，在对于A标签的href中代码进行了@url处理，因为有时项目中用来展示数据的地方会有很多，所以为了使得“分页标签展示页面”得以重用性，又增加了一个类：HtmlHelpers】
5、HtmlHelpers类
public static class HtmlHelpers
{
public static string UrlSet(this HtmlHelper helper, HttpRequestBase request, string queryName, object queryValue)
{
if (queryName != null && queryValue != null)
{
string path = request.Path;
NameValueCollection query = new NameValueCollection(request.QueryString);
query.Set(queryName, queryValue.ToString());
return CreateUrl(path, query);
}
return request.RawUrl;
}
/// <summary>
///
/// </summary>
/// <param name="helper"></param>
/// <param name="request"></param>
/// <param name="queryName"></param>
/// <param name="queryValue"></param>
/// <returns></returns>
public static string UrlAdd(this HtmlHelper helper, HttpRequestBase request, string queryName, object queryValue)
{
if (queryName != null && queryValue != null)
{
string path = request.Path;
NameValueCollection query = new NameValueCollection(request.QueryString);
query.Add(queryName, queryValue.ToString());
return CreateUrl(path, query);
}
return request.RawUrl;
}
public static string UrlRemove(this HtmlHelper helper, HttpRequestBase request, string queryName)
{
if (queryName != null)
{
string path = request.Path;
NameValueCollection query = new NameValueCollection(request.QueryString);
query.Remove(queryName);
return CreateUrl(path, query);
}
return request.RawUrl;
}
public static string UrlRemove(this HtmlHelper helper, HttpRequestBase request, string queryName, object queryValue)
{
if (queryName != null && queryValue != null)
{
string path = request.Path;
NameValueCollection query = new NameValueCollection(request.QueryString);
string[] values = query.GetValues(queryName);
List<string> vs = values.ToList();
vs.Remove(queryValue.ToString());
query.Remove(queryName);
foreach (var item in vs)
{
query.Add(queryName, item);
}
return CreateUrl(path, query);
}
return request.RawUrl;
}
private static string CreateUrl(string path, NameValueCollection query)
{
string url = path;
if (query != null && query.Count != 0)
{
url += "?";
for (int i = 0; i < query.Count; i++)
{
string key = query.GetKey(i);
string[] values = query.GetValues(key);
for (int j = 0; j < values.Length; j++)
{
url += key + "=" + values[j] + "&";
}
}
url = url.TrimEnd('&');
}
return url;
}
}
