How to determine if a file exists in a SharePoint SPFolder [closed]

Answer 1

You can, if you know the URL also use the SPFile.Exists property as follows:

using (SPSite site = new SPSite("http://server/site"))
using (SPWeb web = site.OpenWeb())
{
  SPFile file = web.GetFile("/site/doclib/folder/filename.ext");
  if (file.Exists)
  {
    ...
  }
}

One would on first thought assume SPWeb.GetFile throws an exception if the file does not exist. But as you see this is not the case - it will actually return a SPFile object.

Answer 2

But if you are using SP 2010 Client OM, it would actually throw an exception if the file doesn't exist:

using(var clientContext = new ClientContext(site))
{
     Web web = clientContext.Web;
     Microsoft.SharePoint.Client.File file = web.GetFileByServerRelativeUrl("/site/doclib/folder/filename.ext");
     bool bExists = false;
     try
     {
         clientContext.Load(file);
         clientContext.ExecuteQuery(); //Raises exception if the file doesn't exist
         bExists = file.Exists;  //may not be needed - here for good measure
     }
     catch{   }

     if (bExists )
     {
           .
           .
     }
}

Answer 3

Using a CAML query is the most efficient way (example here)

CAML can be a bit unwieldy, so also worth looking at the Linq to Sharepoint provider, which hides the details of CAML away from you.