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Defining using Aliases

The C# using keyword can also be used to create an alias to a type’s fully qualified name. When you

do so, you are able to define a token that is substituted with the type’s full name at compile time, for

example:

using System;

using MyShapes;

using My3DShapes;

// Resolve the ambiguity using a custom alias.

using The3DHexagon = My3DShapes.Hexagon;

namespace MyApp

{

class ShapeTester

{

static void Main(string[] args)

{

// This is really creating a My3DShapes.Hexagon type.

The3DHexagon h2 = new The3DHexagon();

...

}

}

}

This alternative using syntax can also be used to create an alias to a lengthy namespace. One of

the longer namespaces in the base class library would have to be System.Runtime.Serialization.

Formatters.Binary, which contains a member named BinaryFormatter. If you wish, you could

create an instance of the BinaryFormatter as follows:

using MyAlias = System.Runtime.Serialization.Formatters.Binary;

namespace MyApp

{

class ShapeTester

{

static void Main(string[] args)

{

MyAlias.BinaryFormatter b = new MyAlias.BinaryFormatter();

}

}

}

as well as with a traditional using directive:

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using System.Runtime.Serialization.Formatters.Binary;

namespace MyApp

{

class ShapeTester

{

static void Main(string[] args)

{

BinaryFormatter b = new BinaryFormatter();

}

}

}