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  1. using static System.Console;
  2. using System;
  3.  
  4. public class Program {
  5. 	public static void Main() {
  6. 		DateTime dt = DateTime.Now;
  7. 		DateTime? dtn = null;
  8. 		WriteLine(dt);
  9. 		WriteLine(dtn);
  10. 		dtn = dt;
  11. 		WriteLine(dtn);
  12. 		dt = dtn ?? default(DateTime); //daria erro de compilação se não fizesse esta verificação
  13. 		WriteLine(dtn);
  14. 		dt = dtn.GetValueOrDefault(); //também pode usar isto
  15. 		WriteLine(dtn);
  16. 		dt = dtn.GetValueOrDefault(); //também pode usar isto
  17. 		WriteLine(dtn);
  18. 		if (dtn != null) WriteLine("tem valor");
  19. 		if (dtn.HasValue) WriteLine("tem valor");
  20. 	}
  21. }
  22.  
  23. //https://pt.stackoverflow.com/q/125827/101
Success #stdin #stdout 0.04s 17944KB
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stdin
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Standard input is empty
stdout
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1/6/2020 12:23:03 PM

1/6/2020 12:23:03 PM
1/6/2020 12:23:03 PM
1/6/2020 12:23:03 PM
1/6/2020 12:23:03 PM
tem valor
tem valor
https://ideone.com/pcFMI1
language:
C# (gmcs 5.20.1)
created:
5 years ago
visibility:
public

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