Declaring a Namespace

To declare a namespace, all that is required is that you put namespace followed by a name at the top of your file.

This creates your class Tutorial.Thing. While coding inside your namespace, it will be transparently Thing.

To declare a namespace within a namespace, just place a dot . inbetween each other.

Recommendation Declare a namespace at the top of all your files. Use PascalCase for all your namespaces.

Importing Another Namespace

To use classes from another namespace, you would use the import keyword.

The most common namespace you will import is System.

Both produce the exact same code, it's just easier and clearer with the import.

Recommendation Don't be afraid to import, just don't import namespaces that you aren't using.

Recommendation When importing, import included namespaces first, such as System or Boo.Lang. Then import your 3rd party namespaces. Alphabetize the two groups seperately.

If you are importing from another assembly, you would use the phrase import <target> from <assembly>, for example

System.Data is part of an external library which can be added, System.Data.dll. Gtk is part of the Gtk# library, which, since it has a special name (with a dash in it), it must be quoted.

Recommendation Only use the import <target> from <assembly> if you are using one file and one file only. If you are using more than that, you should be using a build tool, such as NAnt, which is discussed in Part 19 - Using the Boo Compiler.

Exercises

1. Figure out a good exercise for this section.

Go on to Part 13 - Enumerations