#529 – The using Directive Can Create an Alias for a Namespace

The most common use of the using directive is to bring types within a specified namespace into scope, so that they can be referenced directly in your code.

using DogLibrary;
using DogLibrary.Utility;

You can also use the using directive to create an alias for a namespace, which you can then use to access the types in that namespace.

In the example below, we have two different namespaces that each contain a DogLogger type.  Instead of having to list the fully qualified name of either DogLogger type when we use it, we can assign a shorter alias to refer to the containing namespace.

using U1 = DogLibrary.Utility.StandardLogging;
using U2 = DogLibrary.Utility.AlternateLogging;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            // Short for DogLibrary.Utility.StandardLogging.DogLogger
            U1.DogLogger log1 = new U1.DogLogger(@"C:\log1.txt");

            // Short for DogLibrary.Utility.AlternateLogging.DogLogger
            U2.DogLogger log2 = new U2.DogLogger(@"C:\log2.txt");
        }
    }
}
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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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