Open SharePoint Online 365 document from other application without prompt credentials

Your user would need to log into M365. This can typically be accelerated (made automatic) by implement Azure AD Connect Seamless SSO (https://dori-uw-1.kuma-moon.com/en-us/azure/active-directory/hybrid/how-to-connect-sso) or on Windows, join the client machine to Azure AD and have the user log into Windows with AAD credentials.

The application itself needs to integrate with Azure AD, i.e. leveraging Azure AD SSO which may require development effort. It's hard to give you advice on how to do this without knowing more about the application. If the application comes from a 3rd party (i.e. you don't have the source code to implement this), you would need to go back to the vendor to request proper integration with Azure AD.

Hi All,

I have tried the below code,

ClientContext ctx = new ClientContext(siteCollectionUrl); SecureString secureString = new SecureString(); password.ToList().ForEach(secureString.AppendChar); ctx.Credentials = new SharePointOnlineCredentials(userName, secureString);
Site site = ctx.Site;
var file = ctx.Web.GetFileByServerRelativeUrl("/sites/Test/TestSPOnline/Shared Documents//1001/OPL01-00000762.pdf");
ctx.Load(file);
ctx.ExecuteQuery();

The document is loaded in the ClientContext object. I want to open the document in the browser without download.

Hi @Suresh S ,

You can get file and open in browser as the code snippet in attachment:

Reference:

How to Open PDF Files in Web Brower Using ASP.NET

HI Jerryzy,

Thank you for the update. Can you provide me your thoughts that I want to open the SharePoint documents in browser from other/independent applications without credentials prompt? I have only documents URL in independent application/ Programmatically I want to authenticate the URL and open the document without download or stream. Download and streams will take time for large files when multiple users access the same url.

Is there any in Built Web APIs provided by Microsoft to access the documents URL programmatically without download?

Please advise me. Is the below code appropriate for my need? I am directly getting the stream from HttpResponse without looping.

HttpWebRequest request;
request = (HttpWebRequest)WebRequest.Create(strFileUrl); // SharePoint document URL
request.Timeout = 600000000;
request.CookieContainer = new CookieContainer();
request.CookieContainer.Add(cookie); // Authentication using cookie
request.AllowWriteStreamBuffering = false;
byte[] read = null;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream str = response.GetResponseStream();
MemoryStream ms = new MemoryStream();
str .CopyTo(ms);
read = ms.ToArray();

Please provide your thoughts.