dot.net assembly programing - a brief introduction

8/12/2019 DOT.net Assembly Programing - A Brief Introduction

1/15

Assembly

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2/15

Versioning Problem(DLL Hell)

DLL Hell refers to te set of problems ca!sed wen m!ltiple applications attempt to sare a common component like a librar" (DLL) or a $omponent %b&ect 'odel ($%') class.

n te most t"pical case one application will install a new *ersion of te sared component tat is not backward compat*ersion alread" on te macine.

Alto!g te application tat as &!st been installed works +ne existing applications tat depended on a pre*io!s *ersiocomponent migt no longer work.


3/15

Versioning Problem(DLL Hell) contin!e,

-o sol*e tis *ersioning problem.Netintrod!ce te concept ofASSEMBLY.

Assembl" simpli+es te deplo"ment iss!e.

.Netsol*e tis *ersioning problem b" making te dierent dierent *ersion of an assembl".

Now te existing applications tat depended on a pre*io!s *ersion of te sared component also work.

n man" wa"s an assembl" is e0!al to a DLL in toda"1sworld.Assembliesare a 2logical DLLs.2


4/15

3at is an assembl"4

An assembl" is a complied +le wic consist of all te information wic is re0!ired for te $L5 to deplo" te application

Assembl" is also known as P7(Portable 7xec!table +le).

3en te so!rce code of an" lang!age of.Netiscompiledrespecti*ecompiler comes into pict!re.

8!st after compilation compiler generates a +le.

-is +le is called assembl".

Assembl" can be in te form ofEXEorDLL.

f te so!rces code asMain()f!nctiontenafter compilation exe will be generated.

f te so!rces code as notMain()f!nctiontenafter compilation dllwill be generated.


5/15

Part of an Assembl"

An assembl" consist of fo!r part.

Manifest9 'anifest explain te *ersioning information and sec!rit" polic".

Meta Data9 'eta data explain te str!ct!re of a class or t"pe of te class.

IL9 L refers to ntermediate Lang!age. t is te code independent to %: or $P6 beca!se tis code is in s"mbolic code or code wic is onl" !nderstandable b" $L5.

Resouce:t consist of te information of an" image like pat.


6/15

;inds %f An Assembl"

-ere are fo!r t"pes of Assembl"#


7/15

Pri*ate Assembl"

A pri*ate assembl" is an assembl" tat is deplo"ed wit an application and is a*ailable for te excl!si*e !s

-at is oter applications do not sare te pri*ate assembl".

" defa!lt wen te so!rce code is compiled te compiler generates te Pri*ate assembl".

Pri*ate assembl" does not a*e te sec!rit" polic".

f an application wants to access te static assembl" it m!st be located on te same folder in wic pri*atlocated.

:ec!rit" polic" of $L5 pre*ents te access to assemblies kept in dierent#dierent folder.

Pri*ate assembl" does not a*e ABA(A!tentication andA!torisation)


8/15

:ared Assembl"

A sared assembl" is an assembl" a*ailable for !se b" m!ltiple applications on te comp!ter.

:ared assembl" contains te sec!rit" information wic is re0!ired for te $L5.

:ared assembl" can be access b" te application wic is not kept in te same folder in wic assembl" is resided.

-o !se a sared assembl" it is re0!ired to map te assembl" in >lobal Assembl" $ace.

Assemblies sipped witmicrosoft*is!al st!dio.net are sared assemblies.


9/15

D"namic Assembl"

D"namic assemblies are tose assemblies wic is created at 5!n -ime.

-e System.Reection.Emit namespace is !sed for crating te d"namic assembl".

-e System.Reection.Emit namespace contains classes tat allow a compiler or tool to emit metadata and 'lang!age (':L) and optionall" generate a P7 +le on disk.


10/15

:ataliteAssembl"

A .N7- Cramework assembl" containing reso!rces speci+c to a gi*en lang!age.

6sing satellite assemblies "o! can place te reso!rces for dierent lang!ages in dierent assembli

-e correct assembl" is loaded into memor" onl" if te !ser elects to *iew te application in tat lan

:atellite assemblies gi*e tis exibilit"

Eo! create an" simple text +le wit translated strings create reso!rces and p!t tem into tebin!

-at1s it. -e next time "o!r code will read te $!rrent $!lt!re propert" of te c!rrent tread and aappropriate reso!rce.


11/15

'aking an Assembl"

!sing :"stemF

namespacem"pro&

G

P!blic class emplo"ee

G

p!blic string sow()

G

ret!rn 2doing practice of assembl"2F

DLL ne*er contains teMain()f!nction.


12/15

'aking an Assembl" contin!e..

Now sa*e te +le wit te namespaceIs name as#

My#$o%.cs

Nowcomilete +le like tis#

csc&t:lib$a$ymy#$o%.cs

Now a +le is generated namedmy#$o%.!ll

-is +le is known as assembl".


13/15

6sing an assembl"

-o !se an assembl" te reference m!st be added in te program likeusin"my#$o%'

Eam#le

!sing :"stemF

!singm"pro&F

classceck9emplo"ee

G

p!blic static *oid 'ain()

G

ceck cJnew ceck()F

string sJc.sow()F

$onsole.3riteLine(s)F


14/15

6sing an assembl",

Now sa*e te +le in te same folder in wicmy#$o%.!llis kept.

:a*e asc*ec+.cs

Now compile te program like tis#

csc&$:my#$o%.!llc*ec+.cs

Now 5!n te Program .

,ut#ut#

-doing practice of assembl"


15/15

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dot.net assembly programing - a brief introduction

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