Download older version of a file from SharePoint Document Library using CSOM and 404 error

Question

Hi,
I am trying to download previous versions including Major and Minor versions of documents from SharePoint Online using CSOM. I get 404 error when I try to download the file. I found several posts on various discussion forums where people are getting same
error but none of those have any solution/answer. Below is one of the threads and sample code I have tried that results in 404 error. If I use the link in browser directly, I am able to download the file. Also I am able to download the current version of file
using CSOM without any problem, it is only the older versions that give me 404 in CSOM.
http://qandasys.info/how-to-download-the-historical-file-version-content-using-csom/
public int GetStreamFromFile(string docid, string lib, string fileurl, ClientContext clientContext, int iuserid, string Version, bool isCurrrent)
if(!isCurrent)
List LibraryName = clientContext.Web.Lists.GetByTitle(lib);
clientContext.Load(LibraryName);
clientContext.ExecuteQuery();
CamlQuery camlQuery = new CamlQuery();
camlQuery.ViewXml = "" + fileurl +
Microsoft.SharePoint.Client.ListItemCollection collListItem = LibraryName.GetItems(camlQuery);
clientContext.Load(collListItem, items => items.Include(item => item.Id, item => item["FileLeafRef"], item => item["LinkFilename"],
item => item["FileRef"], item => item["File_x0020_Size"], item => item["DocIcon"], item => item.File.Versions));
//clientContext.Load(collListItem);
clientContext.ExecuteQuery();
foreach (Microsoft.SharePoint.Client.ListItem oListItem in collListItem)
//string fileurl1 = (string)oListItem["FileRef"];
//string filename = (string)oListItem["LinkFilename"];
foreach (FileVersion version in oListItem.File.Versions)
if (Version == version.VersionLabel)
//Added excutequery to get object one more time as per blog
//http://social.technet.microsoft.com/Forums/de-DE/sharepointdevelopmentprevious/thread/88a05256-8694-4e40-863d-6c77512e079b
clientContext.ExecuteQuery();
FileInformation fileInformation = ClientOM.File.OpenBinaryDirect(clientContext,version.Url);
bytesarr = ReadFully(fileInformation.Stream);
Darwaish

Answer 1

Hi,
According to your description,
I know you want to get older version of a file from SharePoint Document Library using Client Object Model.
The following code snippet for your reference:
public void GetVersions()
ClientContext clientContext = new ClientContext(“http://SPSite”);
Web site = clientContext.Web;
clientContext.Load(site);
clientContext.ExecuteQuery();
File file = site.GetFileByServerRelativeUrl(“/Shared Documents/mydocument.doc”);
clientContext.Load(file);
clientContext.ExecuteQuery();
ListItem currentItem = file.ListItemAllFields;
clientContext.Load(currentItem);
clientContext.ExecuteQuery();
FileVersionCollection versions = file.Versions;
clientContext.Load(versions);
clientContext.ExecuteQuery();
if (versions != null)
foreach(FileVersion _version in versions)
Console.WriteLine(“Version : {0}”,_version.VersionLabel);
More information:
http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.client.file.versions.aspx
Best Regards,
Dennis Guo