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  1. using System;
  2. using static System.Console;
  3.  
  4. public class Program {
  5. 	public static void Main() {
  6. 		WriteLine("123".Concatenate("456"));
  7. 		string.Concat(null, "xxx");
  8. 	}
  9. }
  10.  
  11. namespace System {
  12. 	public static class StringExt {
  13. 		public static string Concatenate(this string str1, string str2)	=>  string.Concat(str1, str2);
  14. 	}
  15. }
  16.  
  17. //https://pt.stackoverflow.com/q/189606/101
Success #stdin #stdout 0.02s 15908KB
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stdin
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Standard input is empty
stdout
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123456
https://ideone.com/dnNMdN
language:
C# (gmcs 5.20.1)
created:
3 years ago
visibility:
public

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