在ASP.NET中查询字符串和自定义控件

Question

I am working on a website which allows users to upload videos to my site. I want to display the uploaded videos dynamically ie 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);
    }

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" />

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

PS

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

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" />

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

Answer 1

Okay, I learnt that the ~/ is not always useful :) The reason this was not working was

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

I removed the ~/ from the above line and it started to work like a charm :)