If File Exists

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At the moment I'm using the following to change the file path of a pdf viewer depending on a dropdownlist selection

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default : System.Web.UI.Page
{

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        // Make sure you get a valid file path to a pdf in DropDownList1.SelectedValue
        ShowPdf1.FilePath = "attachments/" + DropDownList1.SelectedValue + ".pdf#toolbar=0&navpanes=0&zoom=50";

    }
   
}

I was wondering if it would be possible to do something like the following:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default : System.Web.UI.Page
{

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
If "attachments/" + DropDownList1.SelectedValue + ".pdf" exists
then
        ShowPdf1.FilePath = "attachments/" + DropDownList1.SelectedValue + ".pdf#toolbar=0&navpanes=0&zoom=50";

else
ShowPdf1.FilePath = "attachments/NoFile.pdf#toolbar=0&navpanes=0&zoom=50";

    }
   
}

Posted 12-Aug-10 21:28pm

Comfyasabadger

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2 solutions

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E.F. Nijboer · Answer 1 · 2010-08-12T21:40:00

Solution 1

I think you mean MapPath. That's how you can go from virtual address to file address.

http://msdn.microsoft.com/en-us/library/ms178116.aspx[^]

Good luck!

Posted 12-Aug-10 21:40pm

E.F. Nijboer

Comfyasabadger · Answer 2 · 2010-08-12T23:59:00

Thankyou it put me on the right path to a Solution.

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;

public partial class Default : System.Web.UI.Page
{

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        string filePath = Request.PhysicalApplicationPath + "attachments/" + DropDownList1.SelectedValue + ".pdf";

        FileInfo imageFile = new FileInfo(filePath);
        bool fileExists = imageFile.Exists;

        if (fileExists == false)
            ShowPdf1.FilePath = "attachments/Nofile.pdf#toolbar=0&navpanes=0&zoom=100";
        else
            ShowPdf1.FilePath = "attachments/" + DropDownList1.SelectedValue + ".pdf#toolbar=0&navpanes=0&zoom=50";
    }
}