Remove User from a Site through CSOM

Question

I have a CSOM Script (Below) that I am using to delete a user from a SharePoint Group. But in some of the site the users are added directly to the site.

Can you please let me know, how I can remove a user who is not part of any Group?

I have to run this on each Sub Site in a site collection.

ClientContext clientContext = new ClientContext(siteUrl);
        Web web = clientContext.Web;   

        GroupCreationInformation groupCreationInfo = new GroupCreationInformation();
        groupCreationInfo.Title = "Custom Group";
        groupCreationInfo.Description="Custom group created using Client Object Model";

        User owner = web.EnsureUser(@"domainName\ownerName");
        User member = web.EnsureUser(@"domainName\userName");

        Group group = web.SiteGroups.Add(groupCreationInfo);
        group.Owner = owner;
        group.Users.RemoveUser(member);
        group.Update();       

        clientContext.ExecuteQuery();   

Answer 1

I had a similar issue where I had to just remove a specific user from the site (Web). Following code did it:

var roleAssignments = clientContext.Web.RoleAssignments;

ctx.Load(roleAssignments, r => r.Include(i => i.Member, i => i.RoleDefinitionBindings));
ctx.ExecuteQuery();

for(var i = 0; i < roleAssignments.Count; i++)
{
    var ra = roleAssignments[i];
    if(ra.Member is User && ((User)ra.Member).Title == "USER_TITLE_FOR_MY_SITUATION")
    {
        ra.RoleDefinitionBindings.RemoveAll();
        ra.DeleteObject();
    }
}

ctx.ExecuteQuery();

By extending this code, you can remove them from the site and add them to groups. Hope this helps! :)