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Disambiguating with Aliases
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A more elegant solution to type ambiguity is to use the C# namespace alias feature. This allows you to assign a new name to a type in a namespace one that doesn t collide with a type in another namespace. Listing 11-14 provides a demonstration, with the namespace alias statements shown in bold. Listing 11-14. Disambiguating with Namespace Aliases using using using using BillingSystem; OrderSystem; BillingProduct = BillingSystem.Product; OrderProduct = OrderSystem.Product;
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namespace AuditSystem { class Audit { public static void Main(string[] args) { // create a new instance of a type from // the BillingSystem namespace Bill b = new Bill(); // create a new instance of a type from // the OrderSystem namespace Order o = new Order(); // create instances of each of the Product classes BillingProduct p1 = new BillingProduct(); OrderProduct p2 = new OrderProduct(); } } } You use the using keyword, but instead of importing a namespace, you specify the new name you want to use for a type, followed by the equals sign and then the name of the type you want to alias. So, the following statement:
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using BillingProduct = BillingSystem.Product;
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creates a new alias for the BillingSystem.Product type called BillingProduct. You can then create new instances of BillingProduct, and the C# system knows to translate that back to BillingSystem.Product. I have created two aliases in Listing 11-14, one for each of the types called Product. I could have just created one alias to avoid the name conflict, but it is good practice to alias all of the conflicting types so you don t inadvertently use the original name.
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Aliasing Namespaces
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Another way of disambiguating types is to use the fully qualified names but alias those names to a shorter name. This has the benefit of applying to all the types in a namespace, rather than just one type as we saw in the previous section. Listing 11-15 demonstrates how to alias an entire namespace, with the alias statements shown in bold. Listing 11-15. Disambiguating by Aliasing an Entire Namespace using B = BillingSystem; using O = OrderSystem; namespace AuditSystem { class Audit { public static void Main(string[] args) {
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// create a new instance of a type from // the BillingSystem namespace B.Bill b = new B.Bill(); // create a new instance of a type from // the OrderSystem namespace O.Order o = new O.Order(); // create instances of each of the Product classes B.Product p1 = new B.Product(); O.Product p2 = new O.Product(); } } } You can see from the listing that aliasing an entire namespace is very similar to aliasing a single type. You use the using keyword, followed by the alias you want to use, an equals sign, and, finally, the name of the namespace you want to alias. The following statement:
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using B = BillingSystem;
creates an alias called B for the BillingSystem namespace. Once you have created an alias like this, you can refer to any of the types in the BillingSystem namespace via the alias, like this:
B.Bill b = new B.Bill();
I have used the aliases O and B throughout the example in Listing 11-14. The aliased using statement doesn t let you use the real name of the namespace although you can import it with a second, regular using statement, that can just lead you back to the original problem unless you are careful.
Resolving Type or Namespace Hiding
There is a variation of the ambiguity problem where a type can hide another type, known as type hiding. Listing 11-16 contains an example. Listing 11-16. The Hidden Type Problem using System; namespace AuditSystem { class Audit { public static void Main(string[] args) { System.Console.WriteLine("Hello World"); System.Console.WriteLine("Press enter to finish"); System.Console.ReadLine(); } }
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