How to find the subsite of a document in sharepoint online using CSOM C#.

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Given a document url of a sharepoint online document eg " https://demo.sharepoint.com/sites/Site1/SubSite1/subsiteDocumentLib/DEMO_Doc.docx"

I need to find the subsite url programmatically i.e "https://demo.sharepoint.com/sites/Site1/SubSite1/ "

I am given with Root site Url and its credentials for Context: https://demo.sharepoint.com/sites/Site1/

using (ClientContext cContext = new ClientContext("https://demo.sharepoint.com/sites/Site1/"))
       {
           cContext.Credentials = BuildCreds();


           Site s = cContext.Site;
           cContext.Load(s);
           cContext.ExecuteQuery();
           Web web = cContext.Site.OpenWeb("/sites/Site1/SubSite1/");  //i need to use in this method as  i need to load document from subsite
           cContext.ExecuteQuery();
       }

What I have tried:

I was trying to fetch url using position of "/ " but that fails when there are folders in document library.

Posted 7-Feb-20 8:52am

karekarmahadev

Updated 11-Mar-20 23:39pm

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karekarmahadev · Answer 1 · 2020-03-11T23:40:00

i have managed to get solution for this

public static void GetWebUrl()
 {

            string fileUrl ="https://demo.sharepoint.com/sites/Site1/SubSite1/subsiteDocumentLib/DEMO_Doc.docx";
            Uri fileUri = new Uri(fileUrl);

            ClientContext rootContext = new ClientContext(fileUri.Scheme + Uri.SchemeDelimiter + fileUri.Host);
            Uri webUrl = Web.WebUrlFromPageUrlDirect(rootContext, fileUri);

            ClientContext subContext = new ClientContext(webUrl.ToString());
           


}