Please refer to the Introduction to PnP Core Component and OfficeDevPnP.Core for more details. I have created a console application and added SharePointPnPCore2016 NuGet package for the SharePoint 2016 version.
Code Snippet
  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Threading.Tasks;
  6. using Microsoft.SharePoint.Client;
  7. using OfficeDevPnP.Core;
  9. namespace SP2016PnPCoreComponentDemo
  10. {
  11. class Program
  12. {
  13. static void Main(string[] args)
  14. {
  15. // Input Parameters
  16. string siteUrl = "http://c7395723754/";
  17. string userName = "administrator";
  18. string password = "Mf165Nz2WV";
  19. string domain = "AD2012";
  20. string groupName = "Group created using PnP";
  21. string userLoginName = @"ad2012\administrator";
  22. string roleDefinitionName = "Design";
  23. bool removeExistingPermLevel = false;
  24. OfficeDevPnP.Core.AuthenticationManager authMgr = new OfficeDevPnP.Core.AuthenticationManager();
  26. try
  27. {
  28. // Get the client context
  29. using (var ctx = authMgr.GetNetworkCredentialAuthenticatedContext(siteUrl, userName, password, domain))
  30. {
  31. // Add permission level to user
  32. ctx.Web.AddPermissionLevelToUser(userLoginName, roleDefinitionName, removeExistingPermLevel);
  33. ctx.Web.AddPermissionLevelToUser(userLoginName, RoleType.Contributor, removeExistingPermLevel);
  34. }
  35. }
  37. catch (Exception ex)
  38. {
  39. Console.WriteLine("Error Message: " + ex.Message);
  40. }
  41. }
  42. }
  43. }