Question

我们正在尝试从数据库创建视频播放列表。我们希望从数据库中获取视频的路径，并希望将其传递给li标签

但是

我们不知道如何使用或不使用代码隐藏技术
我们只想添加带表中路径参数的动态列表

Response.Write函数显示列表但位于页面顶部，我们希望在特定div中显示这些列表。

我们的代码隐藏代码

   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Web;
   using System.Web.UI;
   using System.Web.UI.WebControls;
   using System.Data.SqlClient;
   using System.Data;
   using System.Configuration;
   namespace videoplayer
   {
       public partial class VideoPage : System.Web.UI.Page
       {
           SqlConnection con=new     SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
            //protected void Page_Load(object sender, EventArgs e)
            //{

            //}

            public void getdata()
            {
                String html=string.Empty;
                string a = string.Empty;
                string b = string.Empty;
                con.Open();
                SqlCommand cmd = new SqlCommand("Select Filename from VideoFile", con);
                SqlDataReader dr = cmd.ExecuteReader();

                while (dr.Read())
                {
                    html += "<li data-address='local9' class='playlistNonSelected' data-type='local' data-mp4Path='../media/video/1/main/02.mp4' data-ogvPath='../media/video/1/main/02.ogv' data-webmPath='../media/video/1/main/02.webm' data-imagePath='../media/video/1/main/02.jpg' data-description='<span class='infoTitle'>Nulla mauris justo</span><br><br>Aenean egestas. Donec vel sapien ultrices lorem laoreet viverra. Curabitur molestie gravida nisi. Vivamus elementum scelerisque lectus. Etiam interdum, nisi vel adipiscing gravida, leo tortor placerat ipsum, a eleifend velit tortor id ligula. Etiam quis leo a velit mollis vestibulum. Morbi consequat, odio eget feugiat mollis, enim erat dignissim ipsum, eget vehicula sapien metus non massa. Aliquam aliquet sagittis ligula. Sed adipiscing sodales ipsum. Mauris orci ligula, commodo vitae, commodo in, tempor eu, urna. Etiam justo ipsum, gravida vitae, tristique sed, porttitor ac, ipsum. Maecenas elit lectus, elementum id, fermentum eget, accumsan ac, quam. Duis lacinia urna ac nisi. Cras bibendum. In hac habitasse platea dictumst. Morbi iaculis volutpat dui. Pellentesque non leo.;<a href='' target='_blank'>Link</a>'<div class='playlistThumb'><img class='thumb' src='../media/video/1/preview/02.jpg' width='120' height='68' alt=''/></div><div class='playlistInfo'><p><span class='playlistTitle'>Video title goes here</span><br><span class='playlistContent'>Commodo vitae, commodo in, tempor eu, urna. Etiam justo ipsum maecenas nec tellus.</span></p></div></li>";
                    Response.write(html);
            }
           con.Close();
         }
      }
   }

这是我的aspx代码

<div class="playlistData">
  <ul id='playlist1' data-address="playlist1">
    <script language="c#" runat="server" id="123">
       public void Page_Load(object sender, EventArgs e)
         {
           getdata();
          }
    </script>
  <ul>

Answer 1

试试这个：c＃

using System;
using System.Configuration;
using System.Data.SqlClient;
using System.Text;
using System.Web.UI.WebControls;

namespace videoplayer
{
    public partial class VideoPage : System.Web.UI.Page
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);

        protected void Page_Load(object sender, EventArgs e)
        {
            getdata();
        }

        private void getdata()
        {
            StringBuilder htmlBuilder = new StringBuilder();
            string a = string.Empty;
            string b = string.Empty;
            con.Open();
            SqlCommand cmd = new SqlCommand("SELECT Filename FROM VideoFile", con);
            SqlDataReader dr = cmd.ExecuteReader();

            while (dr.Read())
            {
                htmlBuilder.AppendLine("<li data-address='local9' class='playlistNonSelected' data-type='local' data-mp4Path='../media/video/1/main/02.mp4' data-ogvPath='../media/video/1/main/02.ogv' data-webmPath='../media/video/1/main/02.webm' data-imagePath='../media/video/1/main/02.jpg' data-description='<span class='infoTitle'>Nulla mauris justo</span><br><br>Aenean egestas. Donec vel sapien ultrices lorem laoreet viverra. Curabitur molestie gravida nisi. Vivamus elementum scelerisque lectus. Etiam interdum, nisi vel adipiscing gravida, leo tortor placerat ipsum, a eleifend velit tortor id ligula. Etiam quis leo a velit mollis vestibulum. Morbi consequat, odio eget feugiat mollis, enim erat dignissim ipsum, eget vehicula sapien metus non massa. Aliquam aliquet sagittis ligula. Sed adipiscing sodales ipsum. Mauris orci ligula, commodo vitae, commodo in, tempor eu, urna. Etiam justo ipsum, gravida vitae, tristique sed, porttitor ac, ipsum. Maecenas elit lectus, elementum id, fermentum eget, accumsan ac, quam. Duis lacinia urna ac nisi. Cras bibendum. In hac habitasse platea dictumst. Morbi iaculis volutpat dui. Pellentesque non leo.;<a href='' target='_blank'>Link</a>'<div class='playlistThumb'><img class='thumb' src='../media/video/1/preview/02.jpg' width='120' height='68' alt=''/></div><div class='playlistInfo'><p><span class='playlistTitle'>Video title goes here</span><br><span class='playlistContent'>Commodo vitae, commodo in, tempor eu, urna. Etiam justo ipsum maecenas nec tellus.</span></p></div></li>");
            }

            con.Close();

            Literal lit = new Literal();
            lit.Text = htmlBuilder.ToString();
            PlaceHolder1.Controls.Add(lit);
        }
    }
}

aspx文件：添加PlaceHolder

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="VideoPage.aspx.cs" Inherits="videoplayer.VideoPage" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div class="playlistData">
            <ul id='playlist1' data-address="playlist1">
                <asp:PlaceHolder ID="PlaceHolder1" runat="server"><asp:PlaceHolder>
            </ul>
        </div>
    </form>
</body>
</html>

Answer 2

利用Web窗体数据绑定。下面，我们将数据库中的数据提取到DataTable（这只是某些数据的内存中表示），然后我们将该DataTable绑定到Repeater。 Repeater是一个控件，它定义了一个模板，它将模板呈现为绑定到它的集合中每个项目的HTML。

此外，您需要将SqlConnection包裹在using statement中，以确保其得到妥善处理。

public partial class VideoPage : System.Web.UI.Page
{
    public void getdata()
    {
        DataTable dt = new DataTable();
        using(SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString))
        {
            SqlCommand cmd = new SqlCommand("Select Filename from VideoFile", con);
            con.Open();                
            dt.Load(cmd.ExecuteReader());
        }
        VideoRepeater.DataSource = dt;
        VideoRepeater.DataBind();
    }
}

ASPX

<ul>
    <asp:Repeater id="VideoRepeater" runat="server">
        <ItemTemplate>
            <!-- You could do more HTML here -->
            <li><%# Eval("Filename") %></li>
        </ItemTemplate>
    </asp:Repeater>
</ul>

这种技术优于@krlzlx所显示的优势在于，所有HTML都将位于ASPX页面中，而不是作为C＃代码中的字符串嵌入。因此处理引号更容易，Visual Studio可以告诉您是否有任何语法错误。它还可以使您的逻辑保持整洁，并且您可以更轻松地将HTML分成多行并缩进等等。

从aspx中的数据库参数动态添加<li>，无需代码

2 个答案: