.net - Is it possible to extend arrays in C#? -

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I used to add methods like external classes such as IEnumerable 

  static class extension {public static string extension (array array array) {return "yes you can"); }} Class program {static zero main (string [] args) {int [,,,] multidimensional = new int [10,10,10,10]; Console.WriteLine (multiDimArray.Extend ()); }}

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