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F. Iván
Asked: 2020-11-06 09:21:42 +0800 CST 2020-11-06 09:21:42 +0800 CST

What role does the '=>' operator have when declaring attributes of a class?

  • 772

I've been seeing it used in some places =>when declaring attributes on a class. For example:

public class Escritor: IProfesion
{
    public string Trabajo => "Copywriter";
    public string PalabraFavorita { get; set; }
}

How does it =>affect Trabajoya Escritor?

c#

1 Answers

  1. Best Answer

    That is Expression-bodied member or members with body expression (in Spanish).

    This is a feature available since C# 6. This converts the property to readonly. The compiler translates the expression:

    public int Numero => 4;

    A:

    public int Numero { get { return 4;} }

    The advantage of using body expressions is that they reduce code considerably. After that there is no difference between the 2 previous examples.

    It is also possible to use the expression =>from C# 7 onwards to assign the value:

    private int numero;
public int Numero {
  get => numero;
  set => numero = value;
}

    You can also use it in constructors:

    public class Persona
{
  public string Nombre {get; private set;}
  public Persona(string nombre) => this.Nombre = nombre;
}
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