LRecordCount.Text = RecCount.ToString();
//判断跳页文本框失效
if(RecCount <= 20)
gotoPage.Enabled = false;
TDataBind();//调用数据绑定函数TDataBind()进行数据绑定运算
}
}
//计算余页
public int OverPage()
{
int pages = 0;
if(RecCount%PageSize != 0)
pages = 1;
else
pages = 0;
return pages;
}
//计算余页，防止SQL语句执行时溢出查询范围
public int ModPage()
{
int pages = 0;
if(RecCount%PageSize == 0 && RecCount != 0)
pages = 1;
else
pages = 0;
return pages;
}
/*
*计算总记录的静态函数
*本人在这里使用静态函数的理由是：如果引用的是静态数据或静态函数，连接器会优化生成代码，去掉动态重定位项（对
海量数据表分页效果更明显）。
*希望大家给予意见、如有不正确的地方望指正。
*/
public static int Calc()
{
int RecordCount = 0;
SqlCommand MyCmd = new SqlCommand("select count(*) as co from redheadedfile",MyCon());
SqlDataReader dr = MyCmd.ExecuteReader();
if(dr.Read())
RecordCount = Int32.Parse(dr["co"].ToString());
MyCmd.Connection.Close();
return RecordCount;
}
//数据库连接语句（从Web.Config中获取）
public static SqlConnection MyCon()
{
SqlConnection MyConnection = new SqlConnection(ConfigurationSettings.AppSettings["DSN"]);
MyConnection.Open();
return MyConnection;
}
//对四个按钮（首页、上一页、下一页、尾页）返回的CommandName值进行操作
private void Page_OnClick(object sender, CommandEventArgs e)
{
CurrentPage = (int)ViewState["PageIndex"];//从ViewState中读取页码值保存到CurrentPage变量中进行参数运
算
Pages = (int)ViewState["PageCounts"];//从ViewState中读取总页参数运算
string cmd = e.CommandName;
switch(cmd)//筛选CommandName
{
case "next":
CurrentPage ;
break;
case "prev":
CurrentPage--;
break;
case "last":
CurrentPage = Pages;
break;
default:
CurrentPage = 0;
break;
}
ViewState["PageIndex"] = CurrentPage;//将运算后的CurrentPage变量再次保存至ViewState
TDataBind();//调用数据绑定函数TDataBind()
}
private void TDataBind()
{
CurrentPage = (int)ViewState["PageIndex"];//从ViewState中读取页码值保存到CurrentPage变量中进行按钮失
效运算
Pages = (int)ViewState["PageCounts"];//从ViewState中读取总页参数进行按钮失效运算
//判断四个按钮（首页、上一页、下一页、尾页）状态
if (CurrentPage 1 > 1)
{
Fistpage.Enabled = true;
Prevpage.Enabled = true;
}
else
{
Fistpage.Enabled = false;
Prevpage.Enabled = false;
}
if (CurrentPage == Pages)
{
Nextpage.Enabled = false;
Lastpage.Enabled = false;
}
else
{
Nextpage.Enabled = true;
Lastpage.Enabled = true;
}
//数据绑定到DataList控件
DataSet ds = new DataSet();
//核心SQL语句，进行查询运算（决定了分页的效率:)）
SqlDataAdapter MyAdapter = new SqlDataAdapter("Select Top " PageSize " * from redheadedfile where id
not in(select top " PageSize*CurrentPage " id from redheadedfile order by id asc) order by id asc",MyCon());
MyAdapter.Fill(ds,"news");
datalist1.DataSource = ds.Tables["news"].DefaultView;
datalist1.DataBind();
//显示Label控件LCurrentPaget和文本框控件gotoPage状态
LCurrentPage.Text = (CurrentPage 1).ToString();
gotoPage.Text = (CurrentPage 1).ToString();
//释放SqlDataAdapter
MyAdapter.Dispose();
}
#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Fistpage.Command = new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick);
this.Prevpage.Command = new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick);
this.Nextpage.Command = new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick);
this.Lastpage.Command = new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick);
this.gotoPage.TextChanged = new System.EventHandler(this.gotoPage_TextChanged);
this.Load = new System.EventHandler(this.Page_Load);
}
#endregion
//跳页代码
private void gotoPage_TextChanged(object sender, System.EventArgs e)
{
try
{
JumpPage = (int)ViewState["JumpPages"];//从ViewState中读取可用页数值保存到JumpPage变量中
//判断用户输入值是否超过可用页数范围值
if(Int32.Parse(gotoPage.Text) > JumpPage || Int32.Parse(gotoPage.Text) <= 0)
Response.Write("<script>alert('页码范围越界！');location.href='WebForm8.aspx'</script>");
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