Get server-relative URL from SP.Web

Question

I'm trying to retrieve a relative url from a SP.Web I get my sp.web from a SP.list with

SPWeb test = listNL.ParentWeb;

When I try to get the url I got an exception:

test.ServerRelativeUrl' threw an exception of type 'Microsoft.SharePoint.Client.PropertyOrFieldNotInitializedException

test.ServerRelativeUrl;

Do you know a solution to retrieve the relative url from the list?

Answer 1

This error occurs since ServerRelativeUrl property of Web object has not been loaded.

You have to explicitly specify to load ServerRelativeUrl property:

var list = ctx.Web.Lists.GetByTitle(listTitle);
ctx.Load(list,l => l.ParentWeb.ServerRelativeUrl);
ctx.ExecuteQuery(); 
var webUrl = list.ParentWeb.ServerRelativeUrl;

or use List ParentWebUrl property:

var list = ctx.Web.Lists.GetByTitle(listTitle);
ctx.Load(list);
ctx.ExecuteQuery();  
var webUrl = list.ParentWebUrl;

to retrieve Web ServerRelativeUrl property.

How to retrieve List server-relative Url via CSOM

var list = ctx.Web.Lists.GetByTitle(listTitle);
ctx.Load(list,l => l.RootFolder.ServerRelativeUrl);
ctx.ExecuteQuery(); 
var listUrl = list.RootFolder.ServerRelativeUrl;