我用Datalist 做留言板,下面是我留言板 分页的简单代码
运行 后 Datalist 根本就没数据显示出来,这是为什么呢?
求大家指点,不胜感激
public void DataListBind() //将数据绑定到Datalist控件
{
string connectString = @"Data Source=.;Initial Catalog=MyWeb;User ID=sa;Password=123456";
SqlConnection con = new SqlConnection(connectString);
string sql = "select * from Message";
SqlDataAdapter sda = new SqlDataAdapter(sql, con);
DataSet ds = new DataSet();
sda.Fill(ds,"no");
PagedDataSource pds = new PagedDataSource();
pds.DataSource = ds.Tables["no"].DefaultView;
pds.AllowPaging=true;
pds.PageSize = 10;
this.DataList1.DataSource = pds;
this.DataList1.DataBind();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
DataListBind();
} }
运行 后 Datalist 根本就没数据显示出来,这是为什么呢?
求大家指点,不胜感激
public void DataListBind() //将数据绑定到Datalist控件
{
string connectString = @"Data Source=.;Initial Catalog=MyWeb;User ID=sa;Password=123456";
SqlConnection con = new SqlConnection(connectString);
string sql = "select * from Message";
SqlDataAdapter sda = new SqlDataAdapter(sql, con);
DataSet ds = new DataSet();
sda.Fill(ds,"no");
PagedDataSource pds = new PagedDataSource();
pds.DataSource = ds.Tables["no"].DefaultView;
pds.AllowPaging=true;
pds.PageSize = 10;
this.DataList1.DataSource = pds;
this.DataList1.DataBind();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
DataListBind();
} }
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this.DataList1.DataBind();
<% @ Import Namespace="System.Data" %>
<% @ Import Namespace="System.Data.OleDb" %>
<Script Language="C#" Runat="Server">OleDbConnection MyConn;
int PageSize,RecordCount,PageCount,CurrentPage;
public void Page_Load(Object src,EventArgs e)
{
//设定PageSize
PageSize = 10; //连接语句
string MyConnString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source="+Server.MapPath(".")+"//App_Data\\1.mdb;";
MyConn = new OleDbConnection(MyConnString);
MyConn.Open(); //第一次请求执行
if(!Page.IsPostBack)
{
ListBind();
CurrentPage = 0;
ViewState["PageIndex"] = 0; //计算总共有多少记录
RecordCount = CalculateRecord();
lblRecordCount.Text = RecordCount.ToString(); //计算总共有多少页
PageCount = RecordCount/PageSize;
if(RecordCount%PageSize!=0)PageCount++;
lblPageCount.Text = PageCount.ToString();
ViewState["PageCount"] = PageCount;
}
}
//计算总共有多少条记录
public int CalculateRecord()
{
int intCount;
string strCount = "select count(*) as co from hotel";
OleDbCommand MyComm = new OleDbCommand(strCount,MyConn);
OleDbDataReader dr = MyComm.ExecuteReader();
if(dr.Read())
{
intCount = Int32.Parse(dr["co"].ToString());
}
else
{
intCount = 0;
}
dr.Close();
return intCount;
}ICollection CreateSource()
{ int StartIndex; //设定导入的起终地址
StartIndex = CurrentPage*PageSize;
string strSel = "select * from hotel";
DataSet ds = new DataSet(); OleDbDataAdapter MyAdapter = new OleDbDataAdapter(strSel,MyConn);
MyAdapter.Fill(ds,StartIndex,PageSize,"Score"); return ds.Tables["Score"].DefaultView;
}
public void ListBind()
{
score.DataSource = CreateSource();
score.DataBind(); lbnNextPage.Enabled = true;
lbnPrevPage.Enabled = true;
shouye.Enabled= true;
moye.Enabled= true;
if(CurrentPage==(PageCount-1))
{
lbnNextPage.Enabled = false;
moye.Enabled= false;
}
if(CurrentPage==0)
{
lbnPrevPage.Enabled = false;
shouye.Enabled =false;
}
lblCurrentPage.Text = (CurrentPage+1).ToString();}public void Page_OnClick(Object sender,CommandEventArgs e)
{
CurrentPage = (int)ViewState["PageIndex"];
PageCount = (int)ViewState["PageCount"]; string cmd = e.CommandName;
//判断cmd,以判定翻页方向
switch(cmd)
{
case "next":
if(CurrentPage<(PageCount-1)) CurrentPage++;
break;
case "prev":
if(CurrentPage>0) CurrentPage--;
break;
case "shou":
CurrentPage=0 ;
break;
case "mo":
CurrentPage=PageCount-1;
break;
} ViewState["PageIndex"] = CurrentPage; ListBind();}
</script>
<html>
<head>
<title>datalist分页效果</title>
<link href="admin.css" type="text/css" />
</head>
<body>
<form id="Form1" runat="server">
<table style="width: 680px">
<tr>
<td style="width: 680px" align="center">
共有<asp:Label id="lblRecordCount" ForeColor="red" runat="server" />条记录
当前为<asp:Label id="lblCurrentPage" ForeColor="red" runat="server" />/<asp:Label id="lblPageCount" ForeColor="red" runat="server" />页
</td>
</tr>
<tr>
<td style="width: 680px; height: 218px" align="center"><asp:DataList id="score" runat="server"
HeaderStyle-BackColor="#aaaadd"
AlternatingItemStyle-BackColor="Gainsboro"
EditItemStyle-BackColor="yellow" BackColor="White" BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px" CellPadding="4" GridLines="Both"
>
<ItemTemplate>
<table><tr><td width="200px">
酒店名称:<%# DataBinder.Eval(Container.DataItem,"Name") %> </td><td width="120px">星级:<%# DataBinder.Eval(Container.DataItem,"satr") %> </td><td>城市:<%# DataBinder.Eval(Container.DataItem,"City") %> </td></tr></table>
</ItemTemplate>
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<EditItemStyle BackColor="Yellow" />
<SelectedItemStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<ItemStyle BackColor="White" ForeColor="#330099" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
<AlternatingItemStyle BackColor="Gainsboro" />
<HeaderTemplate>
黄山酒店一揽表
</HeaderTemplate>
<FooterTemplate>
</FooterTemplate>
</asp:DataList></td>
</tr>
<tr>
<td style="width: 680px" align="center">
<asp:LinkButton ID="shouye" runat="server" Text="首页" CommandName="shou" OnCommand="Page_OnClick"/>
<asp:LinkButton id="lbnPrevPage" Text="上一页" CommandName="prev" OnCommand="Page_OnClick" runat="server" />
<asp:LinkButton id="lbnNextPage" Text="下一页" CommandName="next" OnCommand="Page_OnClick" runat="server" />
<asp:LinkButton ID="moye" runat="server" Text="末页" CommandName="mo" OnCommand="Page_OnClick"/></td>
</tr>
</table>
</form>
</body>
</html>
<% @ Import Namespace="System.Data" %>
<% @ Import Namespace="System.Data.OleDb" %>
<Script Language="C#" Runat="Server">OleDbConnection MyConn;
int PageSize,RecordCount,PageCount,CurrentPage;
public void Page_Load(Object src,EventArgs e)
{
//设定PageSize
PageSize = 10; //连接语句
string MyConnString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source="+Server.MapPath(".")+"//App_Data\\1.mdb;";
MyConn = new OleDbConnection(MyConnString);
MyConn.Open(); //第一次请求执行
if(!Page.IsPostBack)
{
ListBind();
CurrentPage = 0;
ViewState["PageIndex"] = 0; //计算总共有多少记录
RecordCount = CalculateRecord();
lblRecordCount.Text = RecordCount.ToString(); //计算总共有多少页
PageCount = RecordCount/PageSize;
if(RecordCount%PageSize!=0)PageCount++;
lblPageCount.Text = PageCount.ToString();
ViewState["PageCount"] = PageCount;
}
}
//计算总共有多少条记录
public int CalculateRecord()
{
int intCount;
string strCount = "select count(*) as co from hotel";
OleDbCommand MyComm = new OleDbCommand(strCount,MyConn);
OleDbDataReader dr = MyComm.ExecuteReader();
if(dr.Read())
{
intCount = Int32.Parse(dr["co"].ToString());
}
else
{
intCount = 0;
}
dr.Close();
return intCount;
}ICollection CreateSource()
{ int StartIndex; //设定导入的起终地址
StartIndex = CurrentPage*PageSize;
string strSel = "select * from hotel";
DataSet ds = new DataSet(); OleDbDataAdapter MyAdapter = new OleDbDataAdapter(strSel,MyConn);
MyAdapter.Fill(ds,StartIndex,PageSize,"Score"); return ds.Tables["Score"].DefaultView;
}
public void ListBind()
{
score.DataSource = CreateSource();
score.DataBind(); lbnNextPage.Enabled = true;
lbnPrevPage.Enabled = true;
shouye.Enabled= true;
moye.Enabled= true;
if(CurrentPage==(PageCount-1))
{
lbnNextPage.Enabled = false;
moye.Enabled= false;
}
if(CurrentPage==0)
{
lbnPrevPage.Enabled = false;
shouye.Enabled =false;
}
lblCurrentPage.Text = (CurrentPage+1).ToString();}public void Page_OnClick(Object sender,CommandEventArgs e)
{
CurrentPage = (int)ViewState["PageIndex"];
PageCount = (int)ViewState["PageCount"]; string cmd = e.CommandName;
//判断cmd,以判定翻页方向
switch(cmd)
{
case "next":
if(CurrentPage<(PageCount-1)) CurrentPage++;
break;
case "prev":
if(CurrentPage>0) CurrentPage--;
break;
case "shou":
CurrentPage=0 ;
break;
case "mo":
CurrentPage=PageCount-1;
break;
} ViewState["PageIndex"] = CurrentPage; ListBind();}
</script>
<html>
<head>
<title>datalist分页效果</title>
<link href="admin.css" type="text/css" />
</head>
<body>
<form id="Form1" runat="server">
<table style="width: 680px">
<tr>
<td style="width: 680px" align="center">
共有<asp:Label id="lblRecordCount" ForeColor="red" runat="server" />条记录
当前为<asp:Label id="lblCurrentPage" ForeColor="red" runat="server" />/<asp:Label id="lblPageCount" ForeColor="red" runat="server" />页
</td>
</tr>
<tr>
<td style="width: 680px; height: 218px" align="center"><asp:DataList id="score" runat="server"
HeaderStyle-BackColor="#aaaadd"
AlternatingItemStyle-BackColor="Gainsboro"
EditItemStyle-BackColor="yellow" BackColor="White" BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px" CellPadding="4" GridLines="Both"
>
<ItemTemplate>
<table><tr><td width="200px">
酒店名称:<%# DataBinder.Eval(Container.DataItem,"Name") %> </td><td width="120px">星级:<%# DataBinder.Eval(Container.DataItem,"satr") %> </td><td>城市:<%# DataBinder.Eval(Container.DataItem,"City") %> </td></tr></table>
</ItemTemplate>
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<EditItemStyle BackColor="Yellow" />
<SelectedItemStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<ItemStyle BackColor="White" ForeColor="#330099" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
<AlternatingItemStyle BackColor="Gainsboro" />
<HeaderTemplate>
黄山酒店一揽表
</HeaderTemplate>
<FooterTemplate>
</FooterTemplate>
</asp:DataList></td>
</tr>
<tr>
<td style="width: 680px" align="center">
<asp:LinkButton ID="shouye" runat="server" Text="首页" CommandName="shou" OnCommand="Page_OnClick"/>
<asp:LinkButton id="lbnPrevPage" Text="上一页" CommandName="prev" OnCommand="Page_OnClick" runat="server" />
<asp:LinkButton id="lbnNextPage" Text="下一页" CommandName="next" OnCommand="Page_OnClick" runat="server" />
<asp:LinkButton ID="moye" runat="server" Text="末页" CommandName="mo" OnCommand="Page_OnClick"/></td>
</tr>
</table>
</form>
</body>
</html>
用PageDataSource绑定数据源也行
http://www.webdiyer.com/Controls/AspNetPager/Downloads
这个帖子解决了我的问题
http://topic.csdn.net/u/20090318/12/f09965c7-dcbc-4bb3-a0a3-3a8c267e49e0.html
这个帖子解决了我的问题
http://topic.csdn.net/u/20090318/12/f09965c7-dcbc-4bb3-a0a3-3a8c267e49e0.html