Implementing read-only properties with { get; }

Question

Why doesn\'t this run:

  class Program
  {
    static void Main(string[] args)
    {
      Apple a = new Apple(\"green\");
    }
  }

  class Apple
  {

             


        

Answer 1

Either add a private setter to your property:

public string Colour{ get; private set;}

Or add a readonly backing-field:

private string _colour;
public string Colour{ get return this._colour; }

public Apple(string colour)
{
  this._colour = colour;
}