Please refer to the Introduction to PnP Core Component and OfficeDevPnP.Core for more details. I have created a console application and added SharePointPnPCoreOnline 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 = "Vk3p8L16E6";
  19. string domain = "AD2012";
  20. string leafURL = "pnpdemosite";
  21. string webFullURL = "http://c7395723754/pnpdemosite";
  23. OfficeDevPnP.Core.AuthenticationManager authMgr = new OfficeDevPnP.Core.AuthenticationManager();
  25. try
  26. {
  27. // Get the client context
  28. using (var ctx = authMgr.GetNetworkCredentialAuthenticatedContext(siteUrl, userName, password, domain))
  29. {
  30. // Check if a child web site exists with the specified leaf URL
  31. if (ctx.Web.WebExists(leafURL))
  32. {
  33. Console.WriteLine(leafURL + " - site exists");
  34. }
  36. // Check if a web site exists at the specified full URL
  37. if (ctx.WebExistsFullUrl(webFullURL))
  38. {
  39. Console.WriteLine(webFullURL + " - site exists");
  40. }
  41. }
  42. }
  44. catch (Exception ex)
  45. {
  46. Console.WriteLine("Error Message: " + ex.Message);
  47. }
  48. }
  49. }
  50. }