datalist中绑定ascx,查询后再绑定后图片显示问题

Question

是不是动态加载控件的问题啊？像这种机制，用动态加载控件有用吗？

Answer 1

代码如下 我建立了个用户控件,然后把他放在了datalist的项摸板中,再对datalist进行分页,代码如下:
用户控件book.ascx<table border="0" cellpadding="0" cellspacing="0" >
    <tr>
        <td rowspan = "6">
            <asp:Image ID="Image1" runat="server" Style="position: relative" Width="150px" Height="100px" /></td>
        <td >
            <asp:Label ID="Label1" runat="server" Style="position: relative" Text="科目名称：" Width="80px"></asp:Label></td>
        <td >
            <asp:Label ID="lblSubject" runat="server" Style="position: relative; top: 0px;"></asp:Label></td>
    </tr>
    <tr>
       
        <td >
            <asp:Label ID="Label2" runat="server" Style="position: relative" Text="课件标题：" Width="80px"></asp:Label></td>
        <td >
            <asp:Label ID="lblTitle" runat="server" Style="position: relative; top: 0px;"></asp:Label></td>
    </tr>
    <tr>
        
        <td >
            <asp:Label ID="Label3" runat="server" Style="position: relative" Text="任课教师：" Width="80px"></asp:Label></td>
        <td >
            <asp:Label ID="lblTeacher" runat="server" Style="position: relative; top: 1px;"></asp:Label></td>
    </tr>
    <tr>
        
        <td >
            <asp:Label ID="Label4" runat="server" Style="position: relative" Text="上传日期："></asp:Label></td>
        <td >
            <asp:Label ID="lblInput_time" runat="server" Style="position: relative; top: 0px;"></asp:Label></td>
    </tr>
    <tr>
        
        <td >
            <asp:Label ID="Label5" runat="server" Style="position: relative" Text="在线阅读：" Width="80px"></asp:Label></td>
        <td >
            <asp:HyperLink ID="hlinkDetails" runat="server" Style="position: relative; top: 0px;" Target="_blank">点击这里...</asp:HyperLink></td>
    </tr>
    <tr>
        
        <td colspan ="2">
        </td>
        
    </tr>
</table>book.ascx.cs
public partial class student_book : System.Web.UI.UserControl
{
    string courseTitle;
    public string CourseTitle
    {
        set
        {
            this.courseTitle = value.ToString();
        }
    }    string courseSubject;
    public string CourseSubject
    {
        set
        {
            this.courseSubject = value.ToString();
        }
    }    string uploader;
    public string Uploader
    {
        set
        {
            this.uploader = value.ToString();
        }
    }    protected void Page_Load(object sender, EventArgs e)
    {
       
        SqlConnection con = DB.CreateDB();
        con.Open();
        
        SqlCommand cmd = new SqlCommand("select * from courseWare where courseTitle='" + this.courseTitle + "'and courseSubject='"+ this.courseSubject+"'and uploader='"+ this.uploader+"'", con);
        SqlDataReader sdr = cmd.ExecuteReader();
        while (sdr.Read())
        {
            this.lblSubject.Text = sdr.GetString(2);
            this.lblTitle.Text = sdr.GetString(1);
            this.lblTeacher.Text = sdr.GetString(5);
            this.lblInput_time.Text = sdr.GetDateTime(6).ToShortDateString();
            this.Image1.ImageUrl = sdr.GetString(4);
        }
        sdr.Close();
        con.Close();        this.hlinkDetails.NavigateUrl = "LearnDetalis.aspx?Title=" + Server.UrlEncode(this.courseTitle) + "& Subject="+ Server.UrlEncode(this.courseSubject) + "&uploader="+ Server.UrlEncode(this.uploader);
        
    }
}datalist的分页代码是
protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            this.currentPage.Text = "1";
            this.DataBindToDataList();
        }
    }
    private void DataBindToDataList()
    {
        int curPage = Convert.ToInt32(this.currentPage.Text);
        SqlConnection con = DB.CreateDB();
        con.Open();
        
        SqlDataAdapter sda = new SqlDataAdapter();
        sda.SelectCommand = new SqlCommand("select * from courseWare order by input_time Desc,courseId Desc", con);
        DataSet ds = new DataSet();
        sda.Fill(ds, "course");
        //对PagedDataSource 对象的相关属性赋值 
        PagedDataSource pds = new PagedDataSource();
        pds.DataSource = ds.Tables["course"].DefaultView;
        pds.AllowPaging = true;
        pds.PageSize = 4;        pds.CurrentPageIndex = curPage - 1;
        this.lbtn_next.Visible = true;
        this.lbtn_prior.Visible = true;
        if (curPage == 1)
        {
            this.lbtn_prior.Visible = false;
        }
        if (curPage == pds.PageCount)
        {
            this.lbtn_next.Visible = false;
        }
        this.DataList1.DataSource = pds;
        this.DataList1.DataBind();        con.Close();
    }
    protected void lbtn_next_Click(object sender, EventArgs e)
    {
        this.currentPage.Text = Convert.ToString( Convert.ToInt32(this.currentPage.Text) + 1);
        this.DataBindToDataList();
    }
    protected void lbtn_prior_Click(object sender, EventArgs e)
    {
        this.currentPage.Text = Convert.ToString(Convert.ToInt32(this.currentPage.Text) - 1);
        this.DataBindToDataList();
    }这是分页传递的参数CourseTitle,CourseSubject,Uplaoder
<table border="1" cellpadding="0" cellspacing="0" >
            <tr>
                <td align="center">
                    <asp:DataList ID="DataList1" runat="server" RepeatColumns="2" Style="position: relative" ShowFooter="False" ShowHeader="False">
                        <ItemTemplate>
                            <uc1:book ID="Book1" runat="server" CourseTitle='<%# Eval("courseTitle","{0}") %>' CourseSubject='<%# Eval("courseSubject","{0}") %>' Uploader='<%# Eval("uploader","{0}") %>'/>
                        </ItemTemplate>
                        <AlternatingItemTemplate>
                            <uc1:book ID="Book2" runat="server" CourseTitle='<%# Eval("courseTitle","{0}") %>' CourseSubject='<%# Eval("courseSubject","{0}") %>' Uploader='<%# Eval("uploader","{0}") %>'/>
                        </AlternatingItemTemplate>
                    </asp:DataList>
                    <asp:Label ID="Label2" runat="server" Style="position: relative" Text="当前页："></asp:Label>
                    <asp:Label ID="currentPage" runat="server" Style="position: relative" ></asp:Label>
                    <asp:LinkButton ID="lbtn_next" runat="server" Style="position: relative" OnClick="lbtn_next_Click">下一页</asp:LinkButton>
                    <asp:LinkButton ID="lbtn_prior" runat="server" Style="position: relative" OnClick="lbtn_prior_Click">上一页</asp:LinkButton></td>
            </tr>
        </table>
现在的问题是第一次打开页面时,数据有.但是我点击下一页就没有数据传进来.
我是在datalist中调用用户控件.大家帮我看看什么问题,和我一样不明白的可以听知道的人讲讲学习下.谢谢大家