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Assemblies are the building blocks of .NET Framework
applications; they form the fundamental unit of deployment,
version control, reuse, activation scoping, and security
permissions. An assembly is a collection of types and
resources that are built to work together and form a
logical unit of functionality. An assembly provides the
common language runtime withthe information it needs to be
aware of type implementations. To the runtime, a type does
not exist outside the context of an assembly. Assemblies
are a fundamental part of programming withthe .NET
Framework. An assembly performs the following functions: o
It contains code that the common language runtime executes.
Microsoft intermediate language (MSIL) code in a portable
executable (PE) file will not be executed if it does not
have an associated assembly manifest. Note that each
assembly can have only one entry point (that
is,DllMain,WinMain, orMain). o It forms asecurity boundary.
An assembly is the unit at which permissions are requested
and granted. o It forms atype boundary. Every type?s
identity includes the name of the assembly in which it
resides. A type called MyType loaded in the scope of one
assembly is not the same as a type called MyType loaded in
the scope of another assembly. o It forms areference scope
boundary. The assembly?s manifest contains assembly
metadata that is used for resolving types and satisfying
resource requests. It specifies the types and resources
that are exposed outside the assembly. The manifest also
enumerates other assemblies on which it depends. o It forms
aversion boundary. The assembly is the smallest versionable
unit in the common language runtime; all types and
resources in the same assembly are versioned as a unit. The
assembly?s manifest describes the version dependencies you
specify for any dependent assemblies. o It forms a
deployment unit. When an application starts, only the
assemblies that the application initially calls must be
present. Other assemblies, such as localization resources
or assemblies containing utility classes, can be retrieved
on demand. This allows applications to be kept simple and
thin when first downloaded. o It is the unit at which side-
by-side execution is supported. Assemblies can be static or
dynamic. Static assemblies can include .NET Framework types
(interfaces and classes), as well as resources for the
assembly (bitmaps, JPEG files, resource files, and so on).
Static assemblies are stored on disk in PE files. You can
also use the .NET Framework to create dynamic assemblies,
which are run directly from memory and are not saved to
disk before execution. You can save dynamic assemblies to
disk after they have executed. There are several ways to
create assemblies. You can use development tools, such as
Visual Studio .NET, that you have used in the past to
create .dll or .exe files. You can use tools provided in
the .NET Framework SDK to create assemblies withmodules
created in other development environments. You can also use
common language runtime APIs, such as Reflection.Emit, to
create dynamic assemblies
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