#673 – Types Used in using Statement Must Implement IDisposable

The using statement is a shortcut for a try/finally block where the Dispose method is automatically called on any objects instantiated as part of the using statement.

            using (StreamWriter sw = new StreamWriter(@"D:\Hi.txt"))
            {
                sw.Write("Hi !");
            }
            // StreamWriter.Dispose automatically called

Because the Dispose method is called automatically on all objects instantiated as part of the using statement, each object must belong to a type that implements IDisposable.  The example below leads to a compile-time error because Dog does not implement IDisposable and therefore does not have a Dispose method.

            using (Dog d = new Dog("Kirby", 15))
            {
                d.Bark();
            }

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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.

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