OpenBinaryStream does not exist SharePoint file download using CSOM C#

Question

download a file from the SharePoint 2010 on-premise and from SharePoint online site. The code is working fine SharePoint online file and getting the error Method "OpenBinaryStream" does not exist for the SharePoint 2010 on-premise site:

        var web = clientContext.Web;
        clientContext.Load(web, website => website.ServerRelativeUrl);
        clientContext.ExecuteQuery();
        var regex = new Regex(SiteUrl, RegexOptions.IgnoreCase);
        var siteRelavtiveURL = regex.Replace(path, string.Empty);
        var serverRelativeURL = web.ServerRelativeUrl + siteRelavtiveURL;

        var file = web.GetFileByServerRelativeUrl(serverRelativeURL);
        clientContext.Load(file);
        clientContext.ExecuteQuery();
        var stream = file.OpenBinaryStream();
        clientContext.ExecuteQuery();

        using (var memoryStream = new MemoryStream())
        {
            stream.Value.CopyTo(memoryStream);
            return memoryStream.ToArray();
        }

Answer 1

Try to use FileInformation class to get the file stream:

            var web = clientContext.Web;
            clientContext.Load(web, website => website.ServerRelativeUrl);
            clientContext.ExecuteQuery();
            var regex = new Regex(SiteUrl, RegexOptions.IgnoreCase);
            var siteRelavtiveURL = regex.Replace(path, string.Empty);
            var serverRelativeURL = web.ServerRelativeUrl + siteRelavtiveURL;

            var file = web.GetFileByServerRelativeUrl(serverRelativeURL);
            clientContext.Load(file);
            clientContext.ExecuteQuery();
            FileInformation fileInfo = Microsoft.SharePoint.Client.File.OpenBinaryDirect(clientContext, serverRelativeURL);

            using (var memoryStream = new MemoryStream())
            {
                fileInfo.Stream.CopyTo(memoryStream);
                return memoryStream.ToArray();
            }

Method “OpenBinaryStream” does not exist reading a file from SharePoint 2010

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