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本文由中国C#技术学习中心整理 如果你对本文有不明之处请到技术论坛讨论!
datalist控件没有内置的分页功能,所以对于分页需自己写程序去实现;本示例还包括了DataList的所有基本操作,如添加,删除,修改,选择等;具体代码如下:
前台代码：Default.aspx----------------------------------------
<%@ Page language="c#" Codebehind="Default.aspx.cs" AutoEventWireup="false" Inherits="Example.DataListTest" %>
<!DOCTYPE HTML PUBLIC "- >
<HTML> <HEAD>
<title>DataListTest</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/
intellisense/ie5" name="vs_targetSchema"> <style type="text/css">TD
{
FONT-SIZE: 12px;
COLOR: #000000;
FONT-FAMILY: "宋体"
}
</style> </HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<table cellSpacing="0" cellPadding="0" width="100%" border="0">
<tr>
<td><a href="DlNested.aspx">DataList嵌套实例</a></td>
</tr>
<tr>
<td>
<table cellSpacing="0" borderColorDark="white" cellPadding="0" width="100%" align="center"
border="1">
<tr>
<td>
<asp:datalist id="DataList1" runat="server" Width="90%" Height="280px" RepeatColumns="2" RepeatDirection="Horizontal"
RepeatLayout="Flow">
<headertemplate>
<table id="Table6" cellspacing="0" bordercolordark="white" cellpadding="0" width="100%"
border="1">
<tr>
<td width="80%"><font face="宋体">TypeName</font></td>
<td width="50"><font face="宋体">选择</font></td>
<td width="50"><font face="宋体">确定</font></td>
<td width="50"><font face="宋体">删除</font></td>
</tr>
</table>
</headertemplate>
<selecteditemtemplate>
<font face="宋体">
<table id="Table3" cellspacing="0" cellpadding="0" width="100%" border="1" bordercolordark="white">
<tr>
<td><font face="宋体">TypeID</font></td>
<td><font face="宋体" color="#ff3366"><font face="宋体">TypeName</font></font></td>
</tr>
<tr>
<td style="HEIGHT: 21px"><font face="宋体">
<asp:Label id=lblTypeID runat="server" Text='<%# DataBinder.Eval( Container.DataItem, "I_TypeID" ) %>'>
</asp:Label></font></td>
<td style="HEIGHT: 21px"><font face="宋体" color="#ff3366">
<asp:Label id=lblTypeName runat="server" Text='<%# DataBinder.Eval( Container.DataItem, "C_TypeName" ) %>'>
</asp:Label></font></td>
</tr>
<tr>
<td colspan="2">
<asp:Button id="btnBack" runat="server" CommandName="cancel" Text="返回"></asp:Button></td>
</tr>
</table>
</font>
</selecteditemtemplate>
<footertemplate>
<table id="Table8" cellspacing="0" bordercolordark="white" cellpadding="0" width="100%"
border="1">
<tr>
<td><font face="宋体">TypeID</font></td>
<td>
<asp:TextBox id="txtTypeIDInsert" runat="server"></asp:TextBox></td>
<td><font face="宋体">TypeName</font></td>
<td>
<asp:TextBox id="txtTypeNameInsert" runat="server"></asp:TextBox></td>
<td align="center">
<asp:Button id="btnInsert" runat="server" Text="新增" CommandName="Insert"></asp:Button></td>
</tr>
</table>
</footertemplate>
<itemtemplate>
<table cellspacing="0" cellpadding="0" width="100%" border="1" bordercolordark="white">
<tr>
<td width="80%"><font face="宋体" color="red">
<%# DataBinder.Eval( Container.DataItem,"C_TypeName" )%>
</font>
</td>
<td width="50">
<asp:Button id="btnSelect" runat="server" CommandName="select" Text="选择"></asp:Button></td>
<td width="50">
<asp:Button id="btnModify" runat="server" CommandName="edit" Text="编辑" EnableViewState="true"></asp:Button></td>
<td width="50"><font face="宋体">
<asp:Button id=btnDelete runat="server" CommandName="delete" Text="删除" CommandArgument='<%# DataBinder.Eval( Container.DataItem, "I_TypeID" ) %>'>
</asp:Button></font></td>
</tr>
</table>
</itemtemplate>
<edititemtemplate>
<table id="Table2" cellspacing="0" cellpadding="0" width="100%" border="1">
<tr>
<td style="WIDTH: 75px;
HEIGHT: 23px"><font face="宋体"><font face="宋体">TypeName</font></font></td>
<td style="HEIGHT: 23px"><font face="宋体" color="#ff3366">
<asp:TextBox id=txtTypeName runat="server" Text='<%# DataBinder.Eval( Container.DataItem, "C_TypeName" ) %>'>
</asp:TextBox></font></td>
</tr>
<tr>
<td style="WIDTH: 75px"><font face="宋体">
<asp:Button id=btnUpdate runat="server" CommandName="update" Text="更新" CommandArgument='<%# DataBinder.Eval( Container.DataItem, "I_TypeID" ) %>'>
</asp:Button></font></td>
<td><font face="宋体" color="#ff3366">
<asp:Button id="btnCancle" runat="server" CommandName="cancel" Text="取消"></asp:Button></font></td>
</tr>
</table>
</edititemtemplate>
</asp:datalist></td>
</tr>
</table>
</td>
</tr>
<tr>
<td>
<TABLE cellSpacing="0" borderColorDark="white" cellPadding="0" width="100%" border="1">
<TR align="center">
<TD noWrap width="10%">共
<asp:label id="lblRecNum" runat="server"></asp:label>条记录</TD>
<TD noWrap width="30%">第
<asp:label id="lblCurPageNO" runat="server"></asp:label>页/共
<asp:label id="lblPageNum" runat="server"></asp:label>页</TD>
<TD noWrap width="5%">
<asp:button id="btnFirst" runat="server" Text="首页"></asp:button></TD>
<TD noWrap width="5%">
<asp:button id="btnPreview" runat="server" Text="上页"></asp:button></TD>
<TD noWrap width="5%">
<asp:button id="btnNext" runat="server" Text="下页"></asp:button></TD>
<TD noWrap width="5%">
<asp:button id="btnLast" runat="server" Text="末页"></asp:button></TD>
<TD noWrap width="20%">每页
<asp:dropdownlist id="ddlPageRowNum" runat="server" AutoPostBack="True"></asp:dropdownlist>行</TD>
<TD noWrap width="20%">转到
<asp:dropdownlist id="ddlJumpToPageNum" runat="server" AutoPostBack="True"></asp:dropdownlist>页</TD>
</TR>
</TABLE>
</td>
</tr>
</table>
</form>
</body></HTML>
后台代码：Default.aspx.cs----------------------------------------
/*----------------------------------------------------------------using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
namespace Example
{
public class DataListTest : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataList DataList1;
protected System.Web.UI.WebControls.Label lblRecNum;
protected System.Web.UI.WebControls.Label lblCurPageNO;
protected System.Web.UI.WebControls.Label lblPageNum;
protected System.Web.UI.WebControls.Button btnFirst;
protected System.Web.UI.WebControls.Button btnPreview;
protected System.Web.UI.WebControls.Button btnNext;
protected System.Web.UI.WebControls.Button btnLast;
protected System.Web.UI.WebControls.DropDownList ddlPageRowNum;
protected System.Web.UI.WebControls.DropDownList ddlJumpToPageNum;
protected
string connString;
protected
int pageNum = -1;
protected
int recNum = -1;
protected
int pageRecNum = -1;
protected
int curPageNO = -1;
private void Page_Load( object sender, System.EventArgs e )
{
connString = @"Provider=Microsoft.Jet.OleDb.4.0;
Data Source=" + Request.PhysicalApplicationPath + "DataList.mdb";
if (!Page.IsPostBack)
{
OleDbConnection conn = new OleDbConnection( );
conn.ConnectionString = connString;
conn.Open( );
OleDbCommand cmd = new OleDbCommand( "select count( * ) from ArticleType",conn );
recNum = Convert.ToInt32( cmd.ExecuteScalar( ) );
conn.Close( );
ddlPageRowNum.Items.Clear( );
for(
int i=1;
i<=recNum;
i++)
{
ddlPageRowNum.Items.Add( i.ToString( ) );
}
if (recNum < 5)
{
ddlPageRowNum.SelectedIndex = recNum - 1;
}
else
{
ddlPageRowNum.SelectedIndex = 4;
}
pageRecNum = Convert.ToInt32( ddlPageRowNum.SelectedValue );
if (Convert.ToInt32( recNum % pageRecNum ) == 0)
{
pageNum = Convert.ToInt32( recNum/pageRecNum );
}
else
{
pageNum = Convert.ToInt32( recNum/pageRecNum ) + 1;
}
ddlJumpToPageNum.Items.Clear( );
for(
int i=1;
i<=pageNum;
i++)
{
ddlJumpToPageNum.Items.Add( i.ToString( ) );
}
lblPageNum.Text = pageNum.ToString( );
ViewState["PageRowNum"] = pageRecNum;
ViewState["RecNum"] = recNum;
ViewState["PageNum"] = pageNum;
curPageNO = 1;
ViewState["CurPageNO"] = curPageNO;
}
pageRecNum = Convert.ToInt32( ViewState["PageRowNum"] );
recNum = Convert.ToInt32( ViewState["RecNum"] );
curPageNO = Convert.ToInt32( ViewState["CurPageNO"] );
pageNum = Convert.ToInt32( ViewState["PageNum"] );
if (pageRecNum==-1 || recNum==-1)
{
Response.Write( "发生错误!" );
Response.End( );
}
if (curPageNO <= 1)
{
curPageNO = 1;
btnFirst.Enabled = false;
btnPreview.Enabled = false;
}
lblRecNum.Text = recNum.ToString( );
lblCurPageNO.Text = curPageNO.ToString( );
if (!Page.IsPostBack)
{
BindData( );
}
}
#region Web 窗体设计器生成的代码
override
protected void OnInit( EventArgs e )
{
InitializeComponent( );
base.OnInit( e );
}
private void
InitializeComponent( )
{
this.DataList1.ItemCommand += new System.Web.UI.WebControls.DataListCommandEventHandler( this.DataList1_ItemCommand );
this.DataList1.CancelCommand += new System.Web.UI.WebControls.DataListCommandEventHandler( this.DataList1_CancelCommand );
this.DataList1.EditCommand += new System.Web.UI.WebControls.DataListCommandEventHandler( this.DataList1_EditCommand );
this.DataList1.UpdateCommand += new System.Web.UI.WebControls.DataListCommandEventHandler( this.DataList1_UpdateCommand );
this.DataList1.DeleteCommand += new System.Web.UI.WebControls.DataListCommandEventHandler( this.DataList1_DeleteCommand );
this.DataList1.ItemDataBound += new System.Web.UI.WebControls.DataListItemEventHandler( this.DataList1_ItemDataBound );
this.btnFirst.Click += new System.EventHandler( this.btnFirst_Click );
this.btnPreview.Click += new System.EventHandler( this.btnPreview_Click );
this.btnNext.Click += new System.EventHandler( this.btnNext_Click );
this.btnLast.Click += new System.EventHandler( this.btnLast_Click );
this.ddlPageRowNum.SelectedIndexChanged += new System.EventHandler( this.ddlPageRowNum_SelectedIndexChanged );
this.ddlJumpToPageNum.SelectedIndexChanged += new System.EventHandler( this.ddlJumpToPageNum_SelectedIndexChanged );
this.Load += new System.EventHandler( this.Page_Load );
}
#endregion
#region datelist
private void BindData( )
{
string commandText = "select * from ArticleType";
OleDbConnection conn = new OleDbConnection( );
conn.ConnectionString = connString;
conn.Open( );
OleDbDataAdapter da = new OleDbDataAdapter( commandText,conn );
DataSet ds = new DataSet( );
da.Fill( ds,( curPageNO-1 ) * pageRecNum,pageRecNum,"ArticleType" );
DataList1.DataSource = ds.Tables["ArticleType"];
DataList1.DataBind( );
ds.Clear( );
conn.Close( );
lblCurPageNO.Text = curPageNO.ToString( );
}
private void DataList1_EditCommand( object source, System.Web.UI.WebControls.DataListCommandEventArgs e )
{
DataList1.EditItemIndex = e.Item.ItemIndex;
BindData( );
}
private void DataList1_DeleteCommand( object source, System.Web.UI.WebControls.DataListCommandEventArgs e )
{
string typeID = e.CommandArgument.ToString( );
string commandText = "Delete From ArticleType Where I_TypeID=@TypeID";
OleDbConnection conn = new OleDbConnection( );
conn.ConnectionString = connString;
conn.Open( );
OleDbCommand cmd = new OleDbCommand( commandText,conn );
OleDbParameter[] param = new OleDbParameter[1];
param[0] = new OleDbParameter( "TypeID",typeID );
cmd.Parameters.Add( param[0] );
cmd.ExecuteNonQuery( );
cmd.Parameters.Clear( );
conn.Close( );
recNum --;
lblRecNum.Text = recNum.ToString( );
ddlPageRowNum.Items.Clear( );
for(
int i=1;
i<=recNum;
i++)
{
ddlPageRowNum.Items.Add( i.ToString( ) );
}
ddlPageRowNum.SelectedValue = ViewState["PageRowNum"].ToString( );
pageRecNum = Convert.ToInt32( ddlPageRowNum.SelectedValue );
if (Convert.ToInt32( recNum % pageRecNum ) == 0)
{
pageNum = Convert.ToInt32( recNum/pageRecNum );
}
else
{
pageNum = Convert.ToInt32( recNum/pageRecNum ) + 1;
}
ddlJumpToPageNum.Items.Clear( );
for(
int i=1;
i<=pageNum;
i++)
{
ddlJumpToPageNum.Items.Add( i.ToString( ) );
}
lblPageNum.Text = pageNum.ToString( );
lblCurPageNO.Text = pageNum.ToString( );
ViewState["PageRowNum"] = pageRecNum;
ViewState["RecNum"] = recNum;
ViewState["PageNum"] = pageNum;
curPageNO = Convert.ToInt32( ViewState["CurPageNO"] );
if (curPageNO>pageNum)
{
curPageNO = pageNum;
}
ddlJumpToPageNum.SelectedValue = "1";
ViewState["CurPageNO"] = curPageNO;
if (curPageNO == 1)
{
btnFirst.Enabled = false;
btnPreview.Enabled = false;
}
if (curPageNO == pageNum)
{
btnNext.Enabled = false;
btnLast.Enabled = false;
}
DataList1.EditItemIndex = -1;
DataList1.SelectedIndex = -1;
BindData( );
}
private void DataList1_ItemDataBound( object sender, System.Web.UI.WebControls.DataListItemEventArgs e )
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
Button btnDel = ( Button )e.Item.FindControl( "btnDelete" );
btnDel.Attributes.Add( "onclick","return confirm( '确定要删除[" + DataBinder.Eval( e.Item.DataItem,"C_TypeName" ) + "]吗？' )" );
e.Item.Attributes.Add( "onmouseover","
this.style.backgroundColor='#cccc00'" );
e.Item.Attributes.Add( "onmouseout","
this.style.backgroundColor='white'" );
}
}
private void DataList1_ItemCommand( object source, System.Web.UI.WebControls.DataListCommandEventArgs e )
{
if (e.CommandName == "select")
{
DataList1.SelectedIndex = e.Item.ItemIndex;
BindData( );
}
if (e.CommandName == "Insert")
{
string typeID = ( ( TextBox )e.Item.FindControl( "txtTypeIDInsert" ) ).Text.ToString( );
string typeName = ( ( TextBox )e.Item.FindControl( "txtTypeNameInsert" ) ).Text.ToString( );
string commandText = "Insert Into ArticleType( C_TypeName,I_TypeID )";
commandText = commandText + " Values( @TypeName,@TypeID )";
OleDbConnection conn = new OleDbConnection( );
conn.ConnectionString = connString;
conn.Open( );
OleDbCommand cmd = new OleDbCommand( commandText,conn );
OleDbParameter[] param = new OleDbParameter[2];
param[0] = new OleDbParameter( "TypeName",typeName );
param[1] = new OleDbParameter( "TypeID",typeID );
cmd.Parameters.Add( param[0] );
cmd.Parameters.Add( param[1] );
cmd.ExecuteNonQuery( );
cmd.Parameters.Clear( );
conn.Close( );
recNum ++;
lblRecNum.Text = recNum.ToString( );
ddlPageRowNum.Items.Clear( );
for(
int i=1;
i<=recNum;
i++)
{
ddlPageRowNum.Items.Add( i.ToString( ) );
}
ddlPageRowNum.SelectedValue = ViewState["PageRowNum"].ToString( );
pageRecNum = Convert.ToInt32( ddlPageRowNum.SelectedValue );
if (Convert.ToInt32( recNum % pageRecNum ) == 0)
{
pageNum = Convert.ToInt32( recNum/pageRecNum );
}
else
{
pageNum = Convert.ToInt32( recNum/pageRecNum ) + 1;
}
ddlJumpToPageNum.Items.Clear( );
for(
int i=1;
i<=pageNum;
i++)
{
ddlJumpToPageNum.Items.Add( i.ToString( ) );
}
lblPageNum.Text = pageNum.ToString( );
lblCurPageNO.Text = pageNum.ToString( );
ViewState["PageRowNum"] = pageRecNum;
ViewState["RecNum"] = recNum;
ViewState["PageNum"] = pageNum;
curPageNO = pageNum;
ddlJumpToPageNum.SelectedValue = "1";
ViewState["CurPageNO"] = curPageNO;
btnFirst.Enabled = true;
btnPreview.Enabled = true;
btnNext.Enabled = false;
btnLast.Enabled = false;
DataList1.EditItemIndex = -1;
DataList1.SelectedIndex = -1;
BindData( );
}
}
private void DataList1_CancelCommand( object source, System.Web.UI.WebControls.DataListCommandEventArgs e )
{
DataList1.SelectedIndex = -1;
DataList1.EditItemIndex = -1;
BindData( );
}
private void DataList1_UpdateCommand( object source, System.Web.UI.WebControls.DataListCommandEventArgs e )
{
string typeID = e.CommandArgument.ToString( );
string typeName = ( ( TextBox )e.Item.FindControl( "txtTypeName" ) ).Text.ToString( );
string commandText = "Update ArticleType Set C_TypeName=@TypeName";
commandText = commandText + " Where I_TypeID=@TypeID";
OleDbConnection conn = new OleDbConnection( );
conn.ConnectionString = connString;
conn.Open( );
OleDbCommand cmd = new OleDbCommand( commandText,conn );
OleDbParameter[] param = new OleDbParameter[2];
param[0] = new OleDbParameter( "TypeName",typeName );
param[1] = new OleDbParameter( "TypeID",typeID );
cmd.Parameters.Add( param[0] );
cmd.Parameters.Add( param[1] );
cmd.ExecuteNonQuery( );
cmd.Parameters.Clear( );
conn.Close( );
DataList1.EditItemIndex = -1;
BindData( );
}
#endregion
private void ddlPageRowNum_SelectedIndexChanged( object sender, System.EventArgs e )
{
#region pageRowNum,pageNum
pageRecNum = Convert.ToInt32( ddlPageRowNum.SelectedValue );
if (Convert.ToInt32( recNum % pageRecNum ) == 0)
{
pageNum = Convert.ToInt32( recNum/pageRecNum );
}
else
{
pageNum = Convert.ToInt32( recNum/pageRecNum ) + 1;
}
ddlJumpToPageNum.Items.Clear( );
for(
int i=1;
i<=pageNum;
i++)
{
ddlJumpToPageNum.Items.Add( i.ToString( ) );
}
lblPageNum.Text = pageNum.ToString( );
ViewState["PageRowNum"] = pageRecNum;
ViewState["PageNum"] = pageNum;
if (curPageNO > pageNum)
{
curPageNO = 1;
ViewState["CurPageNO"] = curPageNO.ToString( );
}
btnFirst.Enabled = true;
btnPreview.Enabled = true;
btnNext.Enabled = true;
btnLast.Enabled = true;
if (curPageNO == 1)
{
btnFirst.Enabled = false;
btnPreview.Enabled = false;
}
if (curPageNO == pageNum)
{
btnNext.Enabled = false;
btnLast.Enabled = false;
}
BindData( );
#endregion
}
#region 移动页面
private void MoveFirst( )
{
curPageNO = 1;
ViewState["CurPageNO"] = curPageNO.ToString( );
BindData( );
btnFirst.Enabled = false;
btnPreview.Enabled = false;
btnNext.Enabled = true;
btnLast.Enabled = true;
}
private void MovePrevious( )
{
curPageNO = curPageNO - 1;
ViewState["CurPageNO"] = curPageNO.ToString( );
BindData( );
if (curPageNO == 1)
{
btnFirst.Enabled = false;
btnPreview.Enabled = false;
}
btnNext.Enabled = true;
btnLast.Enabled = true;
}
private void MoveNext( )
{
curPageNO = curPageNO + 1;
ViewState["CurPageNO"] = curPageNO.ToString( );
BindData( );
btnFirst.Enabled = true;
btnPreview.Enabled = true;
if (curPageNO == pageNum)
{
btnNext.Enabled = false;
btnLast.Enabled = false;
}
}
private void MoveLast( )
{
curPageNO = pageNum;
ViewState["CurPageNO"] = curPageNO.ToString( );
BindData( );
btnFirst.Enabled = true;
btnPreview.Enabled = true;
btnNext.Enabled = false;
btnLast.Enabled = false;
}
#endregion
private void btnFirst_Click( object sender, System.EventArgs e )
{
MoveFirst( );
}
private void btnPreview_Click( object sender, System.EventArgs e )
{
MovePrevious( );
}
private void btnNext_Click( object sender, System.EventArgs e )
{
MoveNext( );
}
private void btnLast_Click( object sender, System.EventArgs e )
{
MoveLast( );
}
private void ddlJumpToPageNum_SelectedIndexChanged( object sender, System.EventArgs e )
{
curPageNO = Convert.ToInt32( ddlJumpToPageNum.SelectedValue );
BindData( );
}
}
}
'--------------------分页功能重点用到OleDbDataAdapter的Fill( DataSet,
int,
int,
string )方法,该方法的作用是从指定的ds中读取第N行后的M行;
本文由中国C#技术学习中心整理 如果你对本文有不明之处请到技术论坛讨论!
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