c# - Why is this field declared as private and also readonly? -

-

निम्न कोड में: 

  सार्वजनिक वर्ग MovieRepository: IMovieRepository {निजी केवल पढ़ने के लिए IHtmlDownloader _downloader; सार्वजनिक मूवी रिपोजिटरी (IHtml डाउनलोडर डाउनलोडर) {_downloader = downloader; } सार्वजनिक मूवी FindMovieById (स्ट्रिंग आईडी) {var आईडीयूआरआई = ... बिल्ड यूआरआई ...; Var html = _downloader.DownloadHtml (आईडीयूआरआई); वापसी ... पार्स आईडी HTML ...; } सार्वजनिक मूवी FindMovieByTitle (स्ट्रिंग शीर्षक) {var titleUri = ... build URI ...; Var html = _downloader.DownloadHtml (शीर्षकयूआरआई); वापसी ... शीर्षक शीर्षक एचटीएमएल ...; }}

, और किसी ने इस दृष्टिकोण का सुझाव दिया मेरा प्रश्न यह है कि क्यों IHtmlDownloader चर केवल पढ़ने योग्य है?

अगर यह निजी है और readonly , लाभ यह है कि आप इसे अनजाने में इसे उस कक्षा के दूसरे भाग से बदल नहीं सकते हैं, इसके आरंभ होने के बाद। केवल पढ़ने के लिए संशोधक यह सुनिश्चित करता है कि फ़ील्ड को केवल इसके आरंभीकरण या उसके वर्ग के कंस्ट्रक्टर के दौरान एक मान दिया जा सकता है।

प्रारंभ करने के बाद कार्यात्मक रूप से कुछ परिवर्तन नहीं करना चाहिए, यह हमेशा उपयोग करने के लिए अच्छा अभ्यास है इसे लागू करने के लिए उपलब्ध भाषा निर्माण।


Comments

Post a Comment

Popular posts from this blog

windows - Heroku throws SQLITE3 Read only exception -

-
After I deploy the app to Heroku, I have to run migration scripts and get this error message ... ITES \ padrino \ prophetmargin & gt; Heroku Rack AR: Rack mutated! SQLite3 :: ReadOnlyException: only one try to write database to read: CREATE TABLE "schema_migrations" ( "version" varchar (255) NOT NULL) /disk1/home/slugs/215264_925fd2c_65a3/mnt/.bundle/gems/gems/ padrino-core- is 0.9.11 / lib / padrino-core / cli / rake.rb: 9: in `init ' how can this be? I also tried to run Heroku dbpush SQLite: //db/my-db.db and that did not work Horoku sqlite3 but using postgres does not do. I'm not sure why you are receiving this error, however, as I have used sqlite3 in development and when pushing it into its travel, they do some magic which migrates to postgrads. I'm absolutely sure how Heroku does 'backwash' this database but it seems that this is happening to you because it's the SQLite db file which is obviously due to Heroku's...
Read more

lex - Building a lexical Analyzer in Java -

-
I am currently learning lexical analysis in compiler design. To know how a lexical analyzer actually works, I am trying to build myself. I am planning to make it in Java The input to the lexical analyzer is a .tex file that is of the following format. \ section {script} {intro} \ section {Scope} arbitrary text \ section {relevance} uncontrolled text \ subdivision (profit) arbitrary text \ subsubsection {in real life} \ subdivision {Ingredient} \ end {document} The output of the lecture may be a table of contents with a page number in another file. 1 Introduction 1 1.1 Scope 1 1.2 Relevance 2 1.2.1 Benefits 2 1.2.1.1 Real life 2 1.2.2 loss 3 I hope that This problem is within the scope of Language Analysis Read the .exe file and check '\' and continue to check whether it is actually on search In the sectioning command is set to indicate whether or not a flag variable is the type of sectioning. I hope the above approach will work for the construction of Lexa...
Read more

python - rename keys in a dictionary -

-
I want to change the names of keys in a dictionary which are ints, and I need them so that the inputs with key zero They can sort correctly. For example, my keys are like this: '1', '101', '11' and I may need them: '001', '101', '011' What is doing, but I know that there is a better way tmpDict = {} in the ADC for the old: t MpDict ['% 04d'% int (olden)] = addict [oldkey] New controlled = tmpDict You are going wrong about this if you want to draw entries on a line in a specific way, then you have to sort on the extraction. for sorted (D, key = int): print '% s:% R'% (k, d [k])
Read more