#1,121 – Modifying Elements in a Collection Using foreach

Although the iteration variable in a foreach loop is read-only, you can still use the iteration variable to modify the elements of a collection, as long as they are reference-typed.  (Value-typed elements are immutable).  You’re not changing the iteration variable, but rather changing the object that it refers to.

            List<Dog> myDogs = new List<Dog>
                {
                    new Dog {Name = "Kirby", Age = 15},
                    new Dog {Name = "Ruby", Age = 2},
                    new Dog {Name = "Jack", Age = 17}
                };

            foreach (Dog d in myDogs)
            {
                Console.Write(string.Format("{0} / ", d));
                d.Age++;
                Console.WriteLine(d);
            }

1121-001

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #1,121 – Modifying Elements in a Collection Using foreach

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