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Office365 SharePoint Online Add User To Role Using CSOM

Microsoft introduced a new functionality to interact with CSOM. It has SharePointOnlineCredentials, which will handle any authentication; you should need to do.

This class is included in version 15 of Microsoft.SharePoint.Client dll.

Method

Using this method, it is a simple way to connect to Sharepoint Online sites.

var onlineCredentials = new SharePointOnlineCredentials(Configuration.ServiceUserName, securePassword);

Configure your credentials in a separate configuration class.
  1. private class Configuration  
  2.         {  
  3.   public static string ServiceSiteUrl = "https:// https://gowthamr.sharepoint.com";  
  4.   public static string ServiceUserName = "[email protected]";  
  5.   public static string ServicePassword = "xxxxxxxxxx";  
  6.         }  
  7.           
  8.           
  9. //Create new Context with interating SharePoint Online sites,  
  10. static ClientContext GetonlineContext()  
  11.         {  
  12.             var securePassword = new SecureString();  
  13.             foreach (char c in Configuration.ServicePassword)  
  14.             {  
  15.                 securePassword.AppendChar(c);  
  16.             }  
  17.   
  18.             var onlineCredentials = new SharePointOnlineCredentials(Configuration.ServiceUserName, securePassword);  
  19.   
  20.             var context = new ClientContext(Configuration.ServiceSiteUrl);  
  21.             context.Credentials = onlineCredentials;  
  22.   
  23.             return context;  
  24.         }  
  25.   
  26. //Now we will see about Create A SharePoint List using CSOM method,  
  27. using System;  
  28. using System.Collections.Generic;  
  29. using System.Linq;  
  30. using System.Text;  
  31. using Microsoft.SharePoint.Client;  
  32.    
  33. namespace O365SPAddUsertoRole  
  34. {  
  35.     class Program  
  36.     {  
  37.       
  38.       
  39.      private class Configuration  
  40.         {  
  41.                 public static string ServiceSiteUrl = "https:// https://gowthamr.sharepoint.com";  
  42.                 public static string ServiceUserName = "[email protected]";  
  43.                 public static string ServicePassword = "xxxxxxxxxx";  
  44.         }  
  45.   
  46.                  static ClientContext GetonlineContext()  
  47.                           {  
  48.                                     var securePassword = new SecureString();  
  49.                                     foreach (char c in Configuration.ServicePassword)  
  50.                                     {  
  51.                                         securePassword.AppendChar(c);  
  52.                                     }  
  53.                                     var onlineCredentials = new SharePointOnlineCredentials(Configuration.ServiceUserName, securePassword);  
  54.                                     var context = new ClientContext(Configuration.ServiceSiteUrl);  
  55.                                     context.Credentials = onlineCredentials;  
  56.                                     return context;  
  57.                           }  
  58.   
  59.   
  60.         static void Main(string[] args)  
  61.         {  
  62.             var context=GetonlineContext();  
  63.             Web web = context.Web;   
  64.             Principal user = context.Web.SiteUsers.GetByLoginName(@"X");   
  65.             RoleDefinition readDef = context.Web.RoleDefinitions.GetByName("Read");   
  66.             RoleDefinitionBindingCollection roleDefCollection = new RoleDefinitionBindingCollection(context);   
  67.             roleDefCollection.Add(readDef);   
  68.             RoleAssignment newRoleAssignment = context.Web.RoleAssignments.Add(user, roleDefCollection);   
  69.             context.ExecuteQuery();     
  70.             
  71.         }  
  72.     }  
  73. }  
Run this code and check your SharePoint Site. New Site list is created successfully.
 
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