About ASP. NET List generic paging instances

We used to build an ASP. NET website. We usually bind DataSet to a display control, and use various means to paging, such as PagedDataSource. However, if you retrieve data from the business layer, usually a List, you cannot use the previous method to pagination.

One way is to use ObjectDataSource to bind the GridView and ListView pages. However, if you encounter DataList or Repeater, you have to write the page by yourself. The following is the List generic paging Demo I wrote yesterday. The figure shows the truth:

Run the following code:

List generic paging generic class:

The code is as follows:

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Public class ListPager: List { Private int _ CurrentIndex; Private int _ PageSize; Private int _ TotalItem; Private int _ PageCount; Public int CurrentIndex     { Get {return _ CurrentIndex ;} Set {_ CurrentIndex = value ;}     } Public int PageSize     { Get {return _ PageSize ;} Set {_ PageSize = value ;}     } Public int TotalItem     { Get {return _ TotalItem ;} Set {_ TotalItem = value ;}     } Public int PageCount     { Get {return _ PageCount ;} Set {_ PageCount = value ;}     } Public ListPager (List list, int index, int pageSize)     { This. _ CurrentIndex = index; This. _ PageSize = pageSize; Int startIndex = (this. _ CurrentIndex-1) * PageSize; For (int I = startIndex; I <startIndex + this. _ PageSize & I <list. Count; I ++)         { This. Add (list [I]);         } This. _ TotalItem = list. Count; This. _ PageCount = (this. _ TotalItem/PageSize) + 1;     } }

Model for testing and simulated Bll:

The code is as follows:

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Public partial class NewsModel { Int _ Id; String _ Title; String _ Content; DateTime _ Posttime; Public int Id     { Get {return _ Id ;} Set {_ Id = value ;}     } Public string Title     { Get {return _ Title ;} Set {_ Title = value ;}     } Public string Content     { Get {return _ Content ;} Set {_ Content = value ;}     } Public DateTime Posttime     { Get {return _ Posttime ;} Set {_ Posttime = value ;}     } }

ASP. NET page code (part ):

The code is as follows:

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<H2> ASP. NET generic paging <Div> <H3> Repeater control paging Demo <Ul> <Asp: Repeater ID = "RptNews" runat = "server"> <ItemTemplate> <Li> <% # (Model. NewsModel) Container. DataItem). Id %>, <% # (Model. NewsModel) Container. DataItem). Title %>, <% # (Model. NewsModel) Container. DataItem). Content %>, <% # (Model. NewsModel) Container. DataItem). Posttime %> </li> </ItemTemplate> </Asp: Repeater> </Ul> <Div> <Asp: Label ID = "lblPageInfo" runat = "server" Text = "PageSize"> </asp: Label> <Asp: Button ID = "btnFirstPage" runat = "server" Text = "homepage" OnClick = "btnFirstPage_Click"/> <Asp: Button ID = "btnPrevious" runat = "server" Text = "previous page" OnClick = "btnprevius_click"/> <Asp: Label ID = "lblCurrentPage" runat = "server" Text = "Current"> </asp: Label>         / <Asp: Label ID = "lblTotalPage" runat = "server" Text = "Total"> </asp: Label> Page <Asp: Button ID = "btnNext" runat = "server" Text = "next page" OnClick = "btnNext_Click"/> <Asp: Button ID = "btnLastPage" runat = "server" Text = "Last Page" OnClick = "btnLastPage_Click"/> </Div> </Div>

ASP. NET background code:

The code is as follows:

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Using System; Using System. Collections. Generic; Using System. Web. UI; Using Common; Namespace Web { Public partial class _ Default: System. Web. UI. Page     { Private static ListPager lp = null; Private static int currentIndex = 1; Private static int pageSize = 5; Protected void Page_Load (object sender, EventArgs e)         { If (! Page. IsPostBack)             { BindRepeater (1, pageSize );             }         } Private void BindRepeater (int index, int pageSize)         { BLLDemo. NewsBll optNews = new BLLDemo. NewsBll (); List list = optNews. GetModels (); Lp = new ListPager (list, index, pageSize ); RptNews. DataSource = lp; RptNews. DataBind (); BindPagerControls ();         } Private void BindPagerControls ()         { // Determine whether the previous page and Next Page buttons are enabled. BtnPrevious. Enabled = currentIndex! = 1; BtnNext. Enabled = currentIndex! = Lp. PageCount; LblCurrentPage. Text = lp. CurrentIndex. ToString (); LblTotalPage. Text = lp. PageCount. ToString (); LblPageInfo. Text = String. Format ("{0} records in total, {1} records per page", lp. TotalItem, lp. PageSize );         } Protected void btnprevius_click (object sender, EventArgs e)         { -- CurrentIndex; BindRepeater (currentIndex, pageSize ); BindPagerControls ();         } Protected void btnNext_Click (object sender, EventArgs e)         { ++ CurrentIndex; BindRepeater (currentIndex, pageSize ); BindPagerControls ();         } Protected void btnFirstPage_Click (object sender, EventArgs e)         { CurrentIndex = 1; // Corrected to 1. It was written as 0 at the first sending, and 2B ~ BindRepeater (currentIndex, pageSize );         } Protected void btnLastPage_Click (object sender, EventArgs e)         { CurrentIndex = lp. PageCount; BindRepeater (currentIndex, pageSize );         }     } }