datalist显示信息的小问题..急!!!!!!!!..急!!!!...解决后立马结贴....帮帮忙.............在线等。。。。。。
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class ProductionInfo : System.Web.UI.Page
{
int CurrentPage;//当前页数
int PageSize=4; //每页条数
int PageCount=9; //总页数
int RecordCount=9;//总条数
SqlDataBase my_DataBase = new SqlDataBase();
DataSet ds = new DataSet();
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
CurrentPage = 0;//当前页习惯设为0
ViewState["PageIndex"] = 0;//页索引也设为0
//计算总共有多少记录
RecordCount = CalculateRecord();
//计算总共有多少页
if (RecordCount%PageSize == 0)
{
PageCount = RecordCount / PageSize;
}
else
{
PageCount = RecordCount / PageSize + 1;
}
this.TotalLbl.Text = PageCount.ToString();//显示总页数
ViewState["PageCount"] = PageCount;//会话session 对整个 application 有效 ，而视图状态 viewstate相当于某个页面的 session
this.DataListBind();//不可以放在初始化条件之前就绑定，那样的话，如果仅有一页的数据，“下一页”页仍然显示
bind();
}
PageSize = 4;//每页9条记录
}
public string SubStr(string sString, int nLeng)
{
string sNewStr="";
if (sString.Length <= nLeng)
{
return sString;
}
else
{
sNewStr= sString.Substring(0, nLeng);
sNewStr = sNewStr + "......";
}
return sNewStr;
}
private void bind()//这个方法将数据库中产品内容读出来.显示在HyperLink上面.只显示100个字符..但是这样只能显示一条.因为我第页显示的是四条记录.我想这个显示的和datalist绑定的同步..
{
my_DataBase.SqlConnection_Open();
SqlDataAdapter dar = new SqlDataAdapter("select a.fileContext,b.Production_Name,b.Production_id,b.type,b.Production_purpose from [File] as a,Production as b where b.Production_id=a.ID", my_DataBase.conn);
dar.Fill(ds);
HyperLink lb = (HyperLink)ProList.Items[0].FindControl("HyperLink2");
string str = "";
str = ds.Tables[0].Rows[0][4].ToString();
lb.Text = str;
lb.Text = SubStr(lb.Text, 100);
my_DataBase.connection_close();
}
private int CalculateRecord()
{
try
{
int recordCount;
my_DataBase.SqlConnection_Open();
string sql = "select count(*) as count from Production";
SqlCommand cmd = new SqlCommand(sql,my_DataBase.conn);
SqlDataReader sdr = cmd.ExecuteReader();
if (sdr.Read())
{
recordCount = Int32.Parse(sdr["count"].ToString());
}
else
{
recordCount = 0;
}
sdr.Close();
my_DataBase.connection_close();
return recordCount;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
public void DataListBind()
{
try
{
int StartIndex = CurrentPage * PageSize;//设定导入的起终地址
string sql = "select a.fileContext,b.Production_Name,b.Production_id,b.type,b.Production_purpose from [File] as a,Production as b where b.Production_id=a.ID ";
my_DataBase.SqlConnection_Open();
SqlDataAdapter sda = new SqlDataAdapter(sql,my_DataBase.conn);
sda.Fill(ds, StartIndex, PageSize, "Production");//这是sda.Fill方法的第一次重载，里面的变量分别是数据集DataSet ,开始记录数StartRecord，最大的记录数MaxRecord，数据表名TableName
string str = "";
this.ProList.DataSource = ds.Tables["Production"].DefaultView;
this.ProList.DataBind();
this.PreviousLB.Enabled = true;
this.NextLB.Enabled = true;
if (CurrentPage == (PageCount - 1)) this.NextLB.Enabled = false;//当为最后一页时，下一页链接按钮不可用
if (CurrentPage == 0) this.PreviousLB.Enabled = false;//当为第一页时，上一页按钮不可用
this.CurrentLbl.Text = (CurrentPage + 1).ToString();//当前页数
my_DataBase.connection_close();
}
catch (Exception ex)
{
Response.Write("<script>alert('The System It's Error!')</script>");
}
}
public void LinkButton_Click(Object sender, CommandEventArgs e)//自己编写的按钮点击事件
{
CurrentPage = (int)ViewState["PageIndex"];//获得当前页索引
PageCount = (int)ViewState["PageCount"];//获得总页数
string cmd = e.CommandName;
//判断cmd，以判定翻页方向
try
{
switch (cmd)
{
case "prev"://上一页
if (CurrentPage > 0) CurrentPage--;
break;
case "next":
if (CurrentPage < (PageCount - 1)) CurrentPage++;//下一页
break;
case "first"://第一页
CurrentPage = 0;
break;
case "end"://最后一页
CurrentPage = PageCount - 1;
break;
case "jump"://跳转到第几页
if (this.TextBox1.Text.Trim() == "" || Int32.Parse(this.TextBox1.Text.Trim()) > PageCount)//如果输入数字为空或超出范围则返回
{
return;
}
else
{
CurrentPage = Int32.Parse(this.TextBox1.Text.ToString()) - 1;
break;
}
}
ViewState["PageIndex"] = CurrentPage;//获得当前页
this.DataListBind();//重新将DataList绑定到数据库
}
catch (Exception)
{
Response.Write("<script language=javascript>alert('提示：数据格式错误！')</script>");
}
}
}
bind()//这个方法将数据库中产品内容读出来.显示在HyperLink上面.只显示100个字符..但是这样只能显示一条.因为我第页显示的是四条记录.我想这个显示的和datalist绑定的同步..
哪位大哥帮小弟写一下.刚入门.别见笑..解决后立马结帐.谢谢了...
[解决办法]
public static string FixLenB(string strContent,int sLen) { //超过规定长度加上“…” byte[] s1 = System.Text.Encoding.Default.GetBytes(strContent); int tLen=sLen+2; //规定长度加上“…”的总长度 //若转换为字节的字符串的长度小于指定的长度加上“...”的总长度则执行 if(s1.Length<=tLen) { return strContent; } else { strContent=System.Text.Encoding.Default.GetString(s1,0,sLen)+"…";; return strContent; } }
[解决办法]
目的就是要datalist里的hayperlin显示a.fileContext.因为a.fileContext内容很多.我只显示100个字符.后面为"......"
==>
放在datalist中就可以
<itemtemplate>
<a href="..."><%=FixLenB(Eval("字段").ToString(),100)%></a>