Several methods of displaying a DataGrid control column number in ASP.NET
Author: Zheng Zuo
2004-9-10
There are many controls in APS.NET, which should be DataGrid is the most complete, but it does not provide ready-to-digital display logs, but we can indirectly get the serial number through some of the parameters it. Let's take a look at how to get and display the serial number calculation method as follows:
(1) in the background
DataGrid.currentPageIndex * DataGrid.pageSize E.Item.ItemIndex 1
(2) at the front desk
DataGrid1.currentpageIndex * DataGrid1.pageSize Container.ItemIndex 1
Description:
e represents an instance of the system.web.ui.webcontrols.dataGriditeMeventArgs parameter class;
DataGrid1 here means an example of the front desk;
DataGrid.currentPageIndex: Get or set the index of the current display page;
DataGrid.pageSize: Gets or sets the number of items to display on the single page of the DataGrid control.
Here I used four ways to display the serial number at the front desk, but it was expanded around the above calculation.
(1) Use the DataGrid's itemcreated settings, while the front desk can be a binding column or template column (including empty template);
(2) Use the DataGrid's itemDatabase value, while the front desk can be a binding column or template column (including empty template);
(3) Calculate the expression directly in the front desk;
(4) Calculation of the expression in the background class inheritance is called by the front page class.
Remarks: Setting the extra number of serial numbers when you get data in the database, you don't discuss it, I think this is the worst implementation method.
The following is to get the data of the Customers table of the Northwind database, as follows:
Below is the webformPaging.aspx file code,
<% @ Page language = "c #" codebehind = "WebFormPaging.aspx.cs" autoeventwireup = "false" inherits = "aspnetpaging.webform1"%>
3C
// DTD HTML 4.0 Transitional // En ">
Webform1 </ Title></p>
<p><meta content = "Microsoft Visual Studio .NET 7.1" Name = "Generator"></p>
<p><meta content = "c #" Name = "code_language"></p>
<p><meta content = "javascript" name = "vs_defaultclientscript"></p>
<p><meta content = "http://schemas.microsoft.com/intellisense/ie5" Name = "vs_targetschema"> </ head></p>
<p><body></p>
<p><form id = "form1" method = "post" runat = "server"></p>
<p><Table ID = "Table1" cellspacing = "1" cellpadding = "1" width = "400" align = "center" border = "1"></p>
<p><Tr></p>
<p><TD> <asp: DataGrid ID = "DataGrid1" runat = "server" autogeneratecolumns = "false" width = "100%" allowpaging = "true"></p>
<p><Columns></p>
<p><asp: boundcolumn headertext = "Sequence Number 1"> </ asp: boundcolumn></p>
<p><asp: templatecolumn headertext = "Sequence No. 2"> </ asp: templateColumn></p>
<p><ask: templatecolumn headertext = "Serial No. 3"></p>
<p><Itemtemplate></p>
<p><asp: label id = "itemindex" runat = "server"> </ asp: label></p>
<p></ Itemtemplate></p>
<p></ asp: templateColumn></p>
<p><asp: templatecolumn headertext = "Serial No. 4"></p>
<p><Itemtemplate></p>
<p><% # (DataGrid1.CurrentPageIndex * DataGrid1.pageSize Container.ItemIndex 1)%></p>
<p></ Itemtemplate></p>
<p></ asp: templateColumn></p>
<p><ask: templatecolumn headertext = "serial number 5"></p>
<p><Itemtemplate></p>
<p><% # GetRecordIndex (Container.Index)%></p>
<p></ Itemtemplate></p>
<p></ asp: templateColumn></p>
<p><asp: boundcolumn datafield = "Customerid" Headertext = "Customerid"> </ asp: boundcolumn></p>
<p></ Columns></p>
<p><Pagersty Mode = "NumericPages"> </ PagersTyle></p>
<p></ asp: datagrid> </ td></p>
<p></ TR></p>
<p><Tr></p>
<p><TD> </ td></p>
<p></ TR></p>
<p><Tr></p>
<p><TD> </ td></p>
<p></ Tr> </ table></p>
<p></ form></p>
<p></ body></p>
<p></ Html></p>
<p>The background WebFormPaging.aspx.cs code is as follows:</p>
<p>Using system;</p>
<p>Using system.collections;</p>
<p>Using system.componentmodel;</p>
<p>Using system.data;</p>
<p>Using system.drawing;</p>
<p>Using system.Web;</p>
<p>Using system.Web.SessionState;</p>
<p>Using system.Web.ui;</p>
<p>Using system.Web.ui.webcontrols;</p>
<p>Using system.Web.ui.htmlcontrols;</p>
<p>Namespace aspnetpaging</p>
<p>{</p>
<p>Public class Webform1: System.Web.ui.page</p>
<p>{</p>
<p>Private int recordcount = 0;</p>
<p>Protected system.web.ui.webcontrols.dataGrid DataGrid1;</p>
<p>Private Void Page_Load (Object Sender, System.EventArgs E)</p>
<p>{</p>
<p>IF (! page.ispostback)</p>
<p>{</p>
<p>DataGriddatabind ();</p>
<p>}</p>
<p>}</p>
<p>// Binding data</p>
<p>Private void DataGridDataBind ()</p>
<p>{</p>
<p>DataSet DS = DataAccess.getCustomersdata ();</p>
<p>THIS.DATAGRID1.DATASOURCE = DS;</p>
<p>THIS.DATAGRID1.DATABIND ();</p>
<p>}</p>
<p>#Region web form designer generated code</p>
<p>Override protected void oninit (Eventargs E)</p>
<p>{</p>
<p>InitializationComponent ();</p>
<p>Base.onit (E);</p>
<p>}</p>
<p>/// <summary></p>
<p>/// Designer supports the required method - do not use the code editor to modify</p>
<p>/// This method is content.</p>
<p>/// </ summary></p>
<p>Private vidinitiRizeComponent ()</p>
<p>{</p>
<p>This.DataGrid1.Itemcreated = new system.web.ui.webcontrols.dataGriditeMeventHandler (this.DataGrid1_itemcreated);</p>
<p>This.DataGrid1.pageIndexchanged = new system.web.ui.WebControls.DataGridPageChangeDeventhandler (this.DataGrid1_pageIndexchanged);</p>
<p>This.DataGrid1.itemdatabase.DataGriditeMeventHndler (THISDATAGRID1_ITEMDATABOUND);</p>
<p>This.Load = New System.EventHandler (this.page_load);</p>
<p>}</p>
<p>#ndregion</p>
<p>// turn the page</p>
<p>Private void DataGrid1_pageIndexchanged (Object Source, System.Web.ui.WebControls.DataGridPageChangeDeventargs E)</p>
<p>{</p>
<p>DataGrid1.currentPageIndex = E.NewpageIndex;</p>
<p>DataGriddatabind ();</p>
<p>}</p>
<p>// Get the current item</p>
<p>protected int getRecordIndIndex (int itemindex) {</p>
<p>Return (DataGrid1.currentPageIndex * DataGrid1.pageSize ItemIndex 1);</p>
<p>}</p>
<p>Private void DataGrid1_itemcreated (Object Sender, System.Web.ui.WebControls.DataGriditeMeventArgs E)</p>
<p>{</p>
<p>DataGrid DG = (DATAGRID) Sender;</p>
<p>IF (E.Item.ItemType == ListItemType.Item || E.Item.ItemType == ListItemType.alternatingItem)</p>
<p>{</p>
<p>E.Item.cells [0] .Text = (Dg.CurrentPageIndex * DG.PageSize E.Item.ItemIndex 1) .tostring ();</p>
<p>E.Item.cells [1] .Text = (Dg.CurrentPageIndex * DG.PageSize E.Item.itemindex 1) .tostring ();</p>
<p>}</p>
<p>}</p>
<p>Private void DataGrid1_itemdatabase (Object Sender, System.Web.ui.WebControls.DataGriditeMeventArgs E)</p>
<p>{</p>
<p>DataGrid DG = (DATAGRID) Sender;</p>
<p>IF (E.Item.ItemType == ListItemType.Item || E.Item.ItemType == ListItemType.alternatingItem)</p>
<p>{</p>
<p>(Label) E.Item.FindControl ("itemindex")). Text = (Dg.CurrentPageIndex * DG.PageSize E.Item.itemindex 1) .tostring ();</p>
<p>}</p>
<p>}</p>
<p>}</p>
<p>}</p>
<p>The data layer code is as follows:</p>
<p>Using system;</p>
<p>Using system.data;</p>
<p>Using system.data.sqlclient;</p>
<p>Using system.configuration;</p>
<p>Namespace aspnetpaging</p>
<p>{</p>
<p>Public Class DataAccess</p>
<p>{</p>
<p>Private static string connString = configurationSettings.appsettings ["connString"];</p>
<p>Private dataAccess ()</p>
<p>{</p>
<p>}</p>
<p>Public Static Dataset getCustomersData ()</p>
<p>{</p>
<p>SqlConnection conn = new sqlconnection (connString);</p>
<p>SQLCommand Comm = New Sqlcommand ("getcustomers", conn;</p>
<p>Comm.commandtype = commandtype.storedProcedure;</p>
<p>SqlDataAdapter DataAdapter = New SqlDataAdapter (Comm);</p>
<p>DataSet DS = New DataSet ();</p>
<p>DataAdapter.Fill (DS);</p>
<p>Return DS;</p>
<p>}</p>
<p>}</p>
<p>}</p></div><div class="text-center mt-3 text-grey">
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