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Databind ListView not Updating after Postback

Hi All,

This is probably really simple, but I just cannot see what I am doing wrong - or not doing!

I have a list of files (FileInfo array databound to a ListView) and it displays fine, all it does is list the file names and links them. - Simple.

The problem is that when I upload a new file and the page performs it's post-back, the ListView does not update. But if I go to the page with the ListView by browsing to it again, the list has updated.

I have seen this issue before, but I was able to 'fix' it by forcing a Response.Redirect to itself. - I don't like this at all!

I also tried to perform a Databind immediately after uploading (see the code below) but the issue still exists - no update after postback.

Any help on this would be appreciated.

Cheers,
James


protected void btnUpload_Click(object sender, EventArgs e)
{
  if (fileUpload.HasFile)
  {
    fileUpload.SaveAs(dirServerPath + @"\" + fileUpload.FileName);
    fileList.DataBind();
  }
}

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0
JR-Patterson
Asked:
JR-Patterson
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3 Solutions
 
burakiewiczCommented:
do you have any update panels on the page?
0
 
JR-PattersonAuthor Commented:
Nope. It's all pretty standard stuff.
0
 
burakiewiczCommented:
when does the new file get added to the array of FileInfo?
0
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JR-PattersonAuthor Commented:
Well the directory should be looked up every time the page loads, so the array should update. Here is pretty much what is going on in the page load.

Cheers
if (!dir.Exists)
{
  Directory.CreateDirectory(Server.MapPath(docsDir + "/" + currentCompanyID.ToString()));
}
else
{
  files = dir.GetFiles();
  fileList.DataSource = files;
  fileList.DataBind();
}

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burakiewiczCommented:
i dont think the way its setup it picks up the new file try this.  
protected void btnUpload_Click(object sender, EventArgs e)
{
  if (fileUpload.HasFile)
  {
    fileUpload.SaveAs(dirServerPath + @"\" + fileUpload.FileName);
    files = dir.GetFiles();
    fileList.DataBind();
  }
}

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0
 
JR-PattersonAuthor Commented:
Still no luck I'm afraid. Same result. :(
0
 
JR-PattersonAuthor Commented:
This works though!

Should it really be like this? I guess it could just be made into an 'update' method so I don't have to write it over and over... seems silly though.

Thanks a lot for your help.
protected void btnUpload_Click(object sender, EventArgs e)
{
  if (fileUpload.HasFile)
  {
    fileUpload.SaveAs(dirServerPath + @"\" + fileUpload.FileName);
 
    files = dir.GetFiles();
    fileList.DataSource = files;
    fileList.DataBind();
  }
}

Open in new window

0
 
burakiewiczCommented:
ok just as a test try something like this ull need to put in the code where it gets the dir

protected void btnUpload_Click(object sender, EventArgs e)
{
  if (fileUpload.HasFile)
  {
 
    fileUpload.SaveAs(dirServerPath + @"\" + fileUpload.FileName);
    
if (!dir.Exists)
{
  Directory.CreateDirectory(Server.MapPath(docsDir + "/" + currentCompanyID.ToString()));
}
else
{
  files = dir.GetFiles();
  fileList.DataSource = files;
  fileList.DataBind();
}
 
  }
}

Open in new window

0
 
burakiewiczCommented:
it has to be that way.  Because this event
protected void btnUpload_Click(object sender, EventArgs e)
is fired after the page load. so that is why it was never showing up  You should put it in an update method so you only have to code it in 1 place
0
 
JR-PattersonAuthor Commented:
Makes sense. I will keep this in mind.

Thanks a lot for your help - greatly appreciated.
0
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