ASP. NET MVC4 HtmlHelper extension class, implement paging function, mvc4htmlhelper

ASP. NET MVC4 HtmlHelper extension class, implement paging function, mvc4htmlhelper

1. Extended HtmlHelper class method ShowPageNavigate

Public static HtmlString ShowPageNavigate (this HtmlHelper htmlHelper, int currentPage, int pageSize, int totalCount) {var redirectTo = htmlHelper. viewContext. requestContext. httpContext. request. url. absolutePath; pageSize = 0? 3: pageSize; var totalPages = Math. max (totalCount + pageSize-1)/pageSize, 1); // the total number of pages var output = new StringBuilder (); if (totalPages> 1) {output. appendFormat ("<a class = 'pagelink 'href =' {0 }? PageIndex = 1 & pageSize = {1} '> homepage </a> ", redirectTo, pageSize); if (currentPage> 1) {// process the output of the previous page connection. appendFormat ("<a class = 'pagelink 'href =' {0 }? PageIndex = {1} & pageSize = {2} '> previous page </a> ", redirectTo, currentPage-1, pageSize);} output. append (""); int currint = 5; for (int I = 0; I <= 10; I ++) {// a total of 10 page numbers can be displayed, first 5, next 5 if (currentPage + I-currint)> = 1 & (currentPage + I-currint) <= totalPages) {if (currint = I) {// process output on the current page. appendFormat ("<a class = 'ccp' href = '{0 }? PageIndex = {1} & pageSize = {2} '>{3} </a> ", redirectTo, currentPage, pageSize, currentPage );} else {// General page processing output. appendFormat ("<a class = 'pagelink 'href =' {0 }? PageIndex = {1} & pageSize = {2} '> {3} </a> ", redirectTo, currentPage + I-currint, pageSize, currentPage + I-currint) ;}} output. append ("");} if (currentPage <totalPages) {// process the next page Link output. appendFormat ("<a class = 'pagelink 'href =' {0 }? PageIndex = {1} & pageSize = {2} '> next page </a> ", redirectTo, currentPage + 1, pageSize);} output. append (""); if (currentPage! = TotalPages) {output. AppendFormat ("<a class = 'pagelink 'href =' {0 }? PageIndex = {1} & pageSize = {2} '> last page </a> ", redirectTo, totalPages, pageSize);} output. append ("");} output. appendFormat ("<label> page {0}/total page {1} </label>", currentPage, totalPages ); // return new HtmlString (output. toString ());}

2. Add public classes PagerInfo and PageQuery

public class PagerInfo{  public int RecordCount { get; set; }  public int CurrentPageIndex { get; set; }  public int PageSize { get; set; }}public class PagerQuery<TPager, TEntityList>{  public PagerQuery(TPager pager, TEntityList entityList)  {    this.Pager = pager;    this.EntityList = entityList;  }  public TPager Pager { get; set; }  public TEntityList EntityList { get; set; }}

3. Add the Action in the Controller.

Public ActionResult Index (int? PageSize, int? PageIndex) {int pageIndex1 = pageIndex ?? 1; int pageSize1 = pageSize ?? 5; int count = 0; // obtain data from the database and return the total number of records var temp = newsSer. loadPageEntities (c => true, c => c. id, false, pageSize1, pageIndex1, out count); PagerInfo pager = new PagerInfo (); pager. currentPageIndex = pageIndex1; pager. pageSize = pageSize1; pager. recordCount = count; PagerQuery <PagerInfo, IQueryable <news> query = new PagerQuery <PagerInfo, IQueryable <news> (pager, temp); return View (query );}

4. Some code in the View

<Tbody> @ foreach (var item in Model. entityList) {<tr> <td class = "checkBox"> <input name = "ids []" type = "checkbox" value = ""/> </td> <td> @ item. author </td> <td> @ item. title </td> <td> @ item. ctime </td> <td> @ Html. actionLink ("Edit", "Edit", new {id = item. id}) | @ Html. actionLink ("Delete", "Delete", new {id = item. id }) </td> </tr >}@ * page * @ <tr class = ""> <td colspan = "5" align = "center" class = "paginator"> <span> @ Html. showPageNavigate (Model. pager. currentPageIndex, Model. pager. pageSize, Model. pager. recordCount) </span> </td> </tr> </tbody>

5. Add some styles

.paginator{  font: 12px Arial, Helvetica, sans-serif;  padding: 10px 20px 10px 0;  margin: 0px auto;} .paginator a{  border: solid 1px #ccc;  color: #0063dc;  cursor: pointer;  text-decoration: none;} .paginator a:visited{  padding: 1px 6px;  border: solid 1px #ddd;  background: #fff;  text-decoration: none;} .paginator .cpb{  border: 1px solid #F50;  font-weight: 700;  color: #F50;  background-color: #ffeee5;} .paginator a:hover{  border: solid 1px #F50;  color: #f60;  text-decoration: none;} .paginator a, .paginator a:visited, .paginator .cpb, .paginator a:hover{  float: left;  height: 16px;  line-height: 16px;  min-width: 10px;  _width: 10px;  margin-right: 5px;  text-align: center;  white-space: nowrap;  font-size: 12px;  font-family: Arial,SimSun;  padding: 0 3px;} .paginator label{  display:block;    float:left;  }

6. Summary

In this case, quick paging is implemented in MVC. In fact, many open-source projects have related HtmlHepler extension functions, and there are also some paging extensions, for example, the famous open-source store project nopCommerce has an HtmlExtensions. in the cs extension class, there is paging extension, which is quite professional. If you are interested, you can study it.

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