c# - Saving a file in OneDrive in a .NET application -

i'm doing .net application in c# in addition other features, user can log in onedrive account , save file account. downloaded code windows desktop (.net) guided setup teaches register application , authentication user , part running proposed. however, need know how put part save file in account, root folder of onedrive (the user log account , enter file want save in account , saved in root folder). i've seen examples in github, web applications.

update

using microsoft.identity.client;  public partial class app : application {     private static string clientid = "your_client_id_here";      public static publicclientapplication publicclientapp = new publicclientapplication(clientid);  }  public partial class mainwindow : window {     string _graphapiendpoint = "https://graph.microsoft.com/v1.0/me";      string[] _scopes = new string[] { "user.read" };      public mainwindow()     {         initializecomponent();     }      private async void callgraphbutton_click(object sender, routedeventargs e)     {         authenticationresult authresult = null;          try         {             if (authresult == null)             {                 authresult = await app.publicclientapp.acquiretokensilentasync(_scopes, app.publicclientapp.users.firstordefault());             }         }         catch (msaluirequiredexception ex)         {             // msaluirequiredexception happened on acquiretokensilentasync. indicates need call acquiretokenasync acquire token             system.diagnostics.debug.writeline($"msaluirequiredexception: {ex.message}");              try             {                 authresult = await app.publicclientapp.acquiretokenasync(_scopes);             }             catch (msalexception msalex)             {                 resulttext.text = $"error acquiring token:{system.environment.newline}{msalex}";             }         }         catch (exception ex)         {             resulttext.text = $"error acquiring token silently:{system.environment.newline}{ex}";             return;         }          if (authresult != null)         {             resulttext.text = await gethttpcontentwithtoken(_graphapiendpoint, authresult.accesstoken);             displaybasictokeninfo(authresult);             this.signoutbutton.visibility = visibility.visible;         }     } }  public async task<string> gethttpcontentwithtoken(string url, string token) {     var httpclient = new system.net.http.httpclient();     system.net.http.httpresponsemessage response;     try     {         var request = new system.net.http.httprequestmessage(system.net.http.httpmethod.get, url);         //add token in authorization header         request.headers.authorization = new system.net.http.headers.authenticationheadervalue("bearer", token);         response = await httpclient.sendasync(request);         var content = await response.content.readasstringasync();         return content;     }     catch (exception ex)     {         return ex.tostring();     } } 

reference: windows desktop (.net) guided setup