在asp.net中查询字符串和自定义控件 [英] Query String and Custom Controls in asp.net

问题描述

我正在开设一个网站，允许用户将视频上传到我的网站。我想动态显示上传的视频，即每当用户上传视频时视频都应该可见。为此，我建立了一个自定义控制视频播放器。如果我直接提供mp4url，它工作正常。但是，如果我使用查询字符串传递mp4url，它就无法工作。



我有一个提交页面，允许用户使用文件上传控件上传视频，这些是上传到上传文件夹

I am working on a website which allows users to upload videos to my site. I want to display the uploaded videos dynamically i.e. the videos should be visible whenever an user uploads a video. To do this I have a custom control video player built. It works fine if I provide the "mp4url" directly. However, if I pass the mp4url using querystring, it is not working.

I have a submit page which allows users to upload videos using a fileupload control, and these are uploaded to "Uploads" folder

//Move through the "Uploads" folder and display the thumbnails of the videos after file has been uploaded
    private void LoadThumbnails()
    {
        foreach (string strfile in Directory.GetFiles(Server.MapPath("~/Uploads")))
        {
            ImageButton imageButton = new ImageButton();
            FileInfo fi = new FileInfo(strfile);
            imageButton.ImageUrl = "~/Uploads/" + fi.Name;
            imageButton.Height = Unit.Pixel(100);
            imageButton.Style.Add("padding", "5px");
            imageButton.Width = Unit.Pixel(100);
            imageButton.Click += new ImageClickEventHandler(imageButton_Click);
            Panel1.Controls.Add(imageButton);
        }
    }

    //Redirect to the "Videos" page using Querystring
    protected void imageButton_Click(object sender, ImageClickEventArgs e)
    {
        Response.Redirect("Videos.aspx?VideoURL=" + ((ImageButton)sender).ImageUrl);
    }

有一个名为Videos的页面有一个视频播放器，它使用查询字符串接收Mp4Url

There is a page called "Videos" which has a video player, it receives "Mp4Url" using the querystring

<cc1:VideoPlayer ID="VideoPlayer1"  runat="server" Mp4Url='<%# Request.QueryString["VideoURL"]%>'  Width="400" Height="300" />

这是行不通的，知道哪些更改会纠正这个问题？（问题是视频播放器没有播放视频）



PS

This is not working, any idea of what changes will rectify this issue?(Issue is the video player is not playing the video)

P.S.

protected void Page_Load(object sender, EventArgs e)
      {
        VideoPlayer1.Mp4Url = Request.QueryString["VideoURL"];
      }

即使视频页面代码隐藏文件中的上述代码也无效。



如果我使用

Even the above code in the code behind file for the Videos page is not working.

If i use

<cc1:VideoPlayer ID="VideoPlayer1"  runat="server" Mp4Url="Uploads/movie.mp4"  Width="400" Height="300" />

工作正常。但是，这需要手动分配mp4url。

it's working fine. However, that requires manual allocation of the mp4url.

推荐答案

这对我来说看起来没有用，试图从查询字符串中分配url。



您使用以下行重定向到Videos.aspx：

This does not look valid to me, trying to assign the url from the query string.

You redirect to "Videos.aspx" using this line:

Response.Redirect("Videos.aspx?VideoURL=" + ((ImageButton)sender).ImageUrl);

在 Page_Load （或根据您的需要使用合适的页面方法）Videos.aspx，您可以查看查询字符串并将其分配给自定义控件吗？

In the Page_Load (or the suitable page method as per your need) of "Videos.aspx", you can check the query string and assign it to the custom control?

protected void Page_Load(object sender, EventArgs e)
{
   var url = Request.QueryString["VideoURL"];
   
   if (!string.IsNullOrEmpty(url))
   {
       VideoPlayer1.Mp4Url = url;
   }
}

<％＃..％>格式应该用于数据绑定，这不是数据绑定的合适案例。例如，您可以在网格视图中使用它将属性的值绑定到网格视图列。

The <%# .. %> format should be used for "data-binding" and this is not a suitable case for data binding. For example, you could use this in a grid view to bind the value of a property to a grid view column.

我设法纠正了代码。导致问题的是〜/

I managed to correct the code. It was the "~/" which was causing the problem

imageButton.ImageUrl = "Uploads/" + fi.Name;

上述更改使其有效！

The above change made it work!

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