C # programming Study #2

• ReadOnly (C # Reference)
  • The ReadOnly keyword is a modifier that can be used on a field. When a field declaration includes a readonly modifier, the field assignment introduced by the Declaration can only occur as part of the declaration or in a constructor of the same class

  • Class Age    {        readonly int _year;        Age (Int.)        {            _year = year;        }        void Changeyear ()        {            //_year = 1967;//Compile error if uncommented.        }    }

  • The ReadOnly keyword differs from the const keyword.
  • const field can only is initialized at the declaration of the field. " > const   field can only be initialized in the declaration of that field.
  • readonly field can be initialized either at the declaration or in a constructor." The readonly   field can be initialized in a declaration or constructor. readonly fields can has different values depending on the constructor used. " Therefore, depending on the constructor used, the readonly field may have different values. const field is a Compile-time constant, the readonly field can be used to runtime constants as in the following example: "> Additionally, const field is a compile-time constant , and the readonly field can be used to run a constant number of times

C # programming Study #2