C# 0 The Complete Reference

Asm1

 is linked with 

test1.dll

 and the alias 

Asm2

 is 

linked with 

test2.dll

.

Within the program, the aliases are specified by these two 

extern

 statements at the top 

of the file:

extern alias Asm1;

extern alias Asm2;

Within 

Main( )

, the aliases are used to disambiguate the references to 

MyClass

. Notice how 

the alias is used to refer to 

MyClass

:

Asm1::MyNS.MyClass

The alias is specified first, followed by the namespace resolution operator, followed by the 

name of the namespace that contains the ambiguous class, followed by the dot operator and 

the class name. This same general form works with other 

extern

 aliases.

The output from the program is shown here:

Constructing from MyClass1.dll.

Constructing from MyClass2.dll.

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C

HAPTER 21

Exploring the System 

Namespace

C

HAPTER 22

Strings and Formatting

C

HAPTER 23

Multithreaded Programming

C

HAPTER 24

Collections, Enumerators, 

and Iterators

C

HAPTER 25

Networking Through the 

Internet Using System.Net

C

HAPTER 26

Use System.Windows.Forms 

to Create Form-Based 

Windows Applications

II

Exploring the C# Library

P

art II explores the C# library. As explained in Part I, the class 

library used by C# is the .NET Framework class library. As a 

result, the material in this section applies not only to C#, but to 

the .NET Framework as a whole.

The .NET Framework class library is organized into namespaces. 

To use a portion of the library, you will normally import its namespace 

by including a 

using

 directive. Of course, you can also fully qualify 

the name of the item with its namespace name, but most often, it is 

simply easier to import the entire namespace.

The .NET library is very large, and it is beyond the scope of this 

book to examine each part of it. (A complete description would easily 

fill a very large book!) Instead, Part II examines the core elements of the 

library, many of which are contained in the 

System

 namespace. Also 

discussed are the collection classes, multithreading, and networking.