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在带有模板的数据列表中,我有 3 个要存储的标签(名字、剪贴簿留言、发布时间)、用于存储个人资料图片的图像和一个用于在用户中存储图像的图像控件,将图像作为剪贴簿留言。现在我希望这个图像控件只有在用户发布图像时才可见,否则该行不可见。

代码是

        protected void postscrap_Click(object sender, EventArgs e)
       { 
         SqlConnection con = new SqlConnection();  
          con.ConnectionString=ConnectionStrings["Con"].ConnectionString;
             con.Open();

    DataTable dt2 = new DataTable();


     if (con.State == ConnectionState.Open)

    {

   SqlCommand cmd = new SqlCommand();

    cmd.CommandText = "Insert into Scraps(Emailscrapto,scrap,posttime) Values('" +    Session["UserName"].ToString() + "','" + TextBox2.Text.ToString() + "','" + DateTime.Now.ToString() + "')";

        cmd.Connection = con;

        cmd.CommandType = CommandType.Text;

        cmd.ExecuteNonQuery();

        Response.Redirect("UserHome.aspx");

        TextBox2.Text = "";

        SqlDataAdapter d1 = new SqlDataAdapter(" Select * from Login l  Inner  join    Scraps s  on l.Email = s.Email  Where l.Email = '" + Session["UserName"] + "'", con);

        d1.Fill(dt2);

        DataList1.DataSource = dt2;

        DataList1.DataBind();

        con.Close();
    }

    if (dt2.Rows.Count > 0)
    {
        TextBox2.Text = "";
    }
   protected void postimg_Click(object sender, EventArgs e)
      {
    string ToSaveImageName;
    string sImageFileExtension;

    if (FileUpload1.PostedFile != null)
    {
        //Image postedimage = e.FindControl("postedimage");
        //postedimage.Visible = true;
        string myMap = MapPath("~/").ToLower();
        Random r = new Random();
        int next = r.Next();
        string ImageName = FileUpload1.PostedFile.FileName;
        sImageFileExtension = ImageName.Substring(ImageName.LastIndexOf(".")).ToLower();
        SqlConnection con = new SqlConnection();
        con.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["Con"].ConnectionString;
        con.Open();

        DataTable dt2 = new DataTable();

        if (con.State == ConnectionState.Open)

        {
            SqlCommand cmd = new SqlCommand();
            if (sImageFileExtension == ".gif" || sImageFileExtension == ".png" || sImageFileExtension == ".jpg" || sImageFileExtension == ".jpeg" || sImageFileExtension == ".bmp")
            {
                string ImageSaveURL = myMap + "Postedimages/"+next+sImageFileExtension;
               FileUpload1.PostedFile.SaveAs(ImageSaveURL);
                cmd.CommandText = "Insert into Scraps(Emailscrapto,scrap,posttime) Values('" + Session["UserName"].ToString() + "','" + next + sImageFileExtension + "','" + DateTime.Now.ToString() + "')";
                cmd.Connection = con;
                cmd.CommandType = CommandType.Text;
                cmd.ExecuteNonQuery();
                Response.Redirect("UserHome.aspx");
            }
        }
    }
}
 protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
   if (e.Item.ItemType == ListItemType.Item ||
     e.Item.ItemType == ListItemType.AlternatingItem)
    {  if (FileUpload1.HasFile != null)
        {
            Image postedimage = (Image)e.Item.FindControl("postedimage");
            postedimage.Visible = true;
        }
    }
}

设计源码是这样的

    <asp:DataList ID="DataList1" runat="server" CellPadding="4" Font-Bold="True" Font-     Italic="False"
                Font-Names="Verdana" Font-Overline="False" Font-Size="Medium" Font-Strikeout="False"
                Font-Underline="False" ForeColor="#333333" OnSelectedIndexChanged="DataList1_SelectedIndexChanged"
                Height="1592px" RepeatLayout="Flow" DataSourceID="SqlDataSource1" OnItemCommand="DataList1_ItemCommand"
                OnEditCommand="DataList1_EditCommand" OnItemDataBound="DataList1_ItemDataBound">
                <AlternatingItemStyle BackColor="White" />
                <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                <FooterTemplate>
                    <asp:TextBox ID="txtcomment" runat="server" Height="29px" Width="188px"></asp:TextBox>
                    &nbsp;<br />
                    <br />
                    <asp:Button ID="Insert" runat="server" Text="Insert" OnClick="Insert_Click" />
                </FooterTemplate>
                <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                <ItemStyle BackColor="#FFFBD6" ForeColor="#333333" />
                <ItemTemplate>
                    <table class="style8">
                        <tr>
                            <td bgcolor="#FFFF99" class="style12">
                                <asp:Label ID="Label4" runat="server" Text='<%# Eval("FirstName") %>' Font-Bold="True"
                                    Font-Italic="True" ForeColor="Red"></asp:Label>
                            </td>
                            <td bgcolor="#FFFF99" class="style11">
                                <asp:Image ID="Image3" runat="server" Height="108px" ImageUrl='<%# "~/UserImage/" +Eval("profile_pic") %>'
                                    Width="98px" />
                            </td>
                        </tr>
                        <tr>
                            <td colspan="2" bgcolor="#CCFF99">
                                <asp:Label ID="Label5" runat="server" Text='<%# Eval("scrap") %>' ForeColor="#000066"></asp:Label>
                                &nbsp;
                            </td>
                        </tr>
                        <tr>
                            <td bgcolor="#CCFF99" colspan="2">
                                <asp:Image ID="postedimage" runat="server" Height="202px" ImageUrl='<%# "~/Postedimages/" +Eval("scrap") %>'
                                    Visible="False" Width="262px" />
                            </td>
                        </tr>
                        <tr>
                            <td class="style13" bgcolor="#FFC1B3">
                                <asp:LinkButton ID="Edit" runat="server" CommandName="Edit">Edit</asp:LinkButton>
                            </td>
                            <td bgcolor="#FFC1B3">
                                &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                            </td>
                        </tr>
                        <tr>
                            <td bgcolor="#CABAF8" class="style13" colspan="2">
                                &nbsp;
                            </td>
                        </tr>
                    </table>
                    &nbsp;&nbsp;
                </ItemTemplate>
                <EditItemTemplate>
                    <table class="style14">
                        <tr>
                            <td bgcolor="#E3ACC8">
                                <asp:LinkButton ID="cmnt2" runat="server" CommandName="Comment">Comment</asp:LinkButton>
                                &nbsp;&nbsp;
                                <asp:LinkButton ID="cancel" runat="server" CommandName="Cancel">Cancel</asp:LinkButton>
                            </td>
                        </tr>
                        <tr>
                            <td bgcolor="#CCFFFF">
                                <asp:TextBox ID="TextBox3" runat="server" BorderColor="#003300" BorderStyle="Inset"
                                    Height="30px" Width="486px"></asp:TextBox>
                            </td>
                        </tr>
                    </table>
                    &nbsp;&nbsp;&nbsp;&nbsp;
                    <br />
                </EditItemTemplate>
                <SelectedItemStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
                <SeparatorStyle BackColor="Yellow" Font-Bold="False" Font-Italic="False" Font-Overline="False"
                    Font-Size="Small" Font-Strikeout="False" Font-Underline="False" ForeColor="Maroon"
                    HorizontalAlign="Center" />
            </asp:DataList>

最初,我设置了postedimage.visible=false; 的值。但由于上述编码,出现了空白图像行。

4

1 回答 1

0

您可以根据数据中的值设置依赖项的可见性,但tr您需要将其转换为服务器控件。scrap如果没有图像集,我假设是一个空字符串。

<tr runat="server" visible='<%# Eval("scrap") != "" %>'>
    <td bgcolor="#CCFF99" colspan="2">
        <asp:Image ID="postedimage" runat="server" Height="202px" ImageUrl='<%# "~/Postedimages/" +Eval("scrap") %>'
            Visible="False" Width="262px" />
    </td>
</tr>
于 2012-08-25T11:48:35.890 回答