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I need to generate anonymous links to certain files, using C#, in order to give view access to them (or force user to download them once clicked on the link)

I only have access to the file relative path.

My credentials are stored in a config file and are used when calling the function Crud.GetSharepoint()

Here is my code snippet :

// Crud.GetSharepoint returns a ClientContext object
using (var spCtx = Crud.GetSharepoint())
                {
                    foreach (string attachment in attachments)
                    {
                        if (spCtx.HasPendingRequest)
                            spCtx.ExecuteQuery();
                        Microsoft.SharePoint.Client.File file = spCtx.Web.GetFileByServerRelativeUrl(attachment);
                        spCtx.Load(file);
                        spCtx.ExecuteQuery();
                        // Custom made function that someone advised to use because he coded it
                        // Would prefer using Sharepoint functions directly
                        links.Add(Crud.GetAnonymousLink(spCtx, file, 2, true));
                    }
                }

This code works fine but I need to make some few improvements related on these points :

  • Url generation works great and my url ends with ?Download=1. Yet since the last update, not all files extensions get downloaded directly (everything that is viewable by your internet browser gets downloaded, otherwise you are redirected to a webpage where you can see the file)
  • When I use the Microsoft.SharePoint.Client.File object, load time get extended as files get bigger (is this normal behavior ?). I only need meta-infomation about the file, not it's content

Any suggestions to improve this ?

1
  1. The "Web.CreateAnonymousLink" is only available for SharePoint Online.
  2. You can try to fetch only the meta-data of the file, using CAML:
CamlQuery camlQuery = new CamlQuery();

camlQuery.ViewXml = "View Scope='RecursiveAll'><Query><Where><Eq><FieldRef Name='ServerUrl'></FieldRef><Value Type='Text'>/sites/contoso/Shared Documents/5a8b6e84409589b59936f0fcadf7f99e.jpg</Value></Eq></Where></Query><ViewFields><FieldRef Name='Title' /><FieldRef Name='File_x0020_Size' /><FieldRef Name='File_x0020_Type' /><FieldRef Name='FileDirRef' /><FieldRef Name='FileLeafRef' /><FieldRef Name='FileRef' /><FieldRef Name='ServerUrl' /></ViewFields></View>";

ListItemCollection listCol = docList.GetItems(camlQuery);

Reference: https://msdn.microsoft.com/en-us/library/microsoft.sharepoint.client.web.createanonymouslink.aspx#

  • 1. We are using sharepoint online 2. I will try your CAML query but i was wondering what is docList ? – rak007 May 23 '18 at 14:04
  • docList is List object – Anil Pal May 24 '18 at 5:00
  • @rak007 Great. That means you can use "Web.CreateAnonymousLink". For e.g. Web.CreateAnonymousLink(clientContext, "https://contoso.sharepoint.com/shared%20documents/1.png", false). You can get the base URL with spCtx.Url. You no longer have to access the object of the file, or the properties. – Purvin Desai May 24 '18 at 6:37

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