ASP.NET C# File Access

Question

Architecture of my "ImageDemo" application

Technology : ASP.NET Language : C#

Previous architecture: The asp.net pages are stored in the webserver. A folder named ImageRepository is exist in the webserver. I do store the images (browsed, selected, and stored by users) in the ImageRepository. I could access all the attributes and content of the images stored in ImageRepository. I used to display images using Image control of ASP.NET.

New architecture: Instead of storing the images in a folder of the webserver, I do setup a dedicated Files Server with the following credentials(say)

user name : my_name

password : wXy12Apl

I could login to the system, access the folder where I stored the images, read the all attributes of the files. Then I added the file name to a dropdown list,so it will look ;like this

enter image description here

So on the onselectedindexchanged event I tried to display the images using Image control of ASP.NET. But I could not. What will be the problem? I could access all the attributes of the files, but I could not read the content of image.

For eg; When I select first image, the contol looks like enter image description here

When I select second image, the contol looks like enter image description here

Post some relevant code please.

user447356
– user447356

2011-06-06 08:27:25 +00:00
Commented Jun 6, 2011 at 8:27 — user447356
– user447356, Commented Jun 6, 2011 at 8:27

MAW74656 · Accepted Answer · 2011-06-06 18:58:05Z

1

You may not have permission to the file. You can do like @Smudge202 suggests and apply the correct permissions, or you can run part of your code in a different context. See this code for impersonating a user: http://www.codeproject.com/KB/cs/zetaimpersonator.aspx

answered Jun 6, 2011 at 18:58

MAW74656

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Smudge202 · Accepted Answer · 2011-06-06 08:24:15Z

The browser / end-user does not have access to the file server. There are a couple quick solutions you can implement:

1) Add permission for end users to read from the new file share - if your site is internal (on a LAN only) then this is possibly the best solution. If the site is exposed to the internet this may not prove to be the most secure solution.

2) Create a simple web service (WCF or ASMX). Ensure the service can read from the new share, and have the service return the content as a webresponse.

Here is an (almost complete) example of the latter, an old piece of code responding from the old style asp.net handler (ashx) which implements IHttpHandler - I'd recommend using WCF personally:

Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
    _Context = context
    _Context.Response.Clear()
    _Context.Response.ContentType = "image/jpg"
    If ImageParameter IsNot Nothing Then

        Dim imageData As Byte() = Nothing
        If String.IsNullOrEmpty(ImageParameter.CompressedFileStorageLocation) Then
            Return
        End If

        Dim imagePath As String = String.Format("{0}{1}", CS_IMAGE_REPOSITORY_BASE_PATH, ImageParameter.CompressedFileStorageLocation)
        Try
            If IO.File.Exists(imagePath) Then
                Using s As FileStream = New FileStream(imagePath, FileMode.Open)
                    ReDim imageData(s.Length)
                    Dim bytesRead As Integer = s.Read(imageData, 0, s.Length)
                    s.Close()
                End Using
            End If
        Catch ex As Exception
            Debug.Print(ex.Message)
        End Try

        _Context.Response.OutputStream.Write(imageData, 0, imageData.Length)
    End If

End Sub

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