How to find object type from URL SharePoint online (o365)? - sharepoint

Question

I found out how to determine the object type from URL for SharePoint on prem:
https://blogs.msdn.microsoft.com/sanjaynarang/2009/04/06/find-sharepoint-object-type-from-url/
But I didn't find anything for SharePoint Online (CSOM).
Is it possible for SharePoint online?

Answer 1

For the most scenarios such as:
folder url, e.g. https://contoso.sharepoint.com//Documents/Forms/AllItems.aspx?RootFolder=%2FDocuments%2FArchive
list item url, e.g. https://contoso.sharepoint.com/Lists/ShoppingCart/DispForm.aspx?ID=9
list/library url, e.g. https://contoso.sharepoint.com/Lists/Announcements
page url, e.g. https://contoso.sharepoint.com/Lists/Announcements/Newsletter.aspx
the following example demonstrates how to determine client object type:
using System;
using System.Linq;
using System.Linq.Expressions;
using System.Net;
using System.Web;
using Microsoft.SharePoint.Client;
namespace O365Console
{
static class ClientObjectExtensions
{
public static ClientObject ResolveClientObjectFromUrl(string resourceUrl, ICredentials credentials)
{
ClientObject targetObject = null;
var resourceUri = new Uri(resourceUrl);
using (var rootCtx = new ClientContext(resourceUri.Scheme + Uri.SchemeDelimiter + resourceUri.Host))
{
rootCtx.Credentials = credentials;
var webUrl = Web.WebUrlFromPageUrlDirect(rootCtx, resourceUri);
using (var ctx = new ClientContext(webUrl.ToString()))
{
ctx.Credentials = credentials;
var queryBag = System.Web.HttpUtility.ParseQueryString(resourceUri.Query);
if (queryBag["Id"] != null)
{
var listUrl = string.Join(string.Empty,
resourceUri.Segments.Take(resourceUri.Segments.Length - 1));
var list = ctx.Web.GetList(listUrl);
targetObject = TryRetrieve(() => list.GetItemById(Convert.ToInt32(queryBag["Id"])));
}
else if (queryBag["RootFolder"] != null)
{
var folderUrl = HttpUtility.UrlDecode(queryBag["RootFolder"]);
targetObject = TryRetrieve(() => ctx.Web.GetFolderByServerRelativeUrl(folderUrl));
}
else if (queryBag.Count > 0)
{
throw new Exception("Unsupported query string parameter found");
}
else
{
targetObject = TryRetrieve(() => ctx.Web.GetFileByServerRelativeUrl(resourceUri.AbsolutePath));
if (targetObject == null)
{
targetObject = TryRetrieve(() => ctx.Web.GetList(resourceUri.AbsolutePath),list => list.RootFolder);
if (targetObject == null || ((List)targetObject).RootFolder.ServerRelativeUrl != resourceUri.AbsolutePath)
targetObject = TryRetrieve(() => ctx.Web.GetFolderByServerRelativeUrl(resourceUri.AbsolutePath));
}
}
}
}
return targetObject;
}
private static T TryRetrieve<T>(Func<T> loadMethod, params Expression<Func<T,object>>[] retrievals) where T : ClientObject
{
try
{
var targetObject = loadMethod();
targetObject.Context.Load(targetObject, retrievals);
targetObject.Context.ExecuteQuery();
return targetObject;
}
catch
{
}
return default(T);
}
}
}
Usage
var credentials = GetCredentials(userName, password);
var clientObj = ClientObjectExtensions.ResolveClientObjectFromUrl("https://contoso.sharepoint.com/Lists/Announcements", credentials);
Console.WriteLine(clientObj.GetType().Name);
where
static ICredentials GetCredentials(string userName,string password)
{
var securePassword = new SecureString();
foreach (var c in password)
{
securePassword.AppendChar(c);
}
return new SharePointOnlineCredentials(userName, securePassword);
}