投稿時間:2023-08-25 18:18:13 RSSフィード2023-08-25 18:00 分まとめ(23件)

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IT	ITmedia 総合記事一覧	[ITmedia Mobile] ソニーがXperia新製品を9月1日に発表　「Xperia 5 V」登場か	https://www.itmedia.co.jp/mobile/articles/2308/25/news165.html	itmediamobile	2023-08-25 17:51:00
AWS	lambdaタグが付けられた新着投稿 - Qiita	TerraformでAWS Lambdaをデプロイする方法	https://qiita.com/curlneko/items/15607f8ef319cc97a75e	awsiam	2023-08-25 17:26:30
python	Pythonタグが付けられた新着投稿 - Qiita	α>0,β>0,a>0,b>0,2*α+β=pi/4,tanα=1/a,tanβ=1/b 「2011熊本県立大学前期【3】」をChatGPTとWolframAlphaとsympyでやってみたい。	https://qiita.com/mrrclb48z/items/a5b2577f8df73334eba1	chatgpt	2023-08-25 17:58:12
js	JavaScriptタグが付けられた新着投稿 - Qiita	playwrightで要素を選択する方法5種類とその挙動の違い	https://qiita.com/ko-he-8/items/85116e1d99ed4b176657	playwright	2023-08-25 17:06:42
Linux	Ubuntuタグが付けられた新着投稿 - Qiita	さくっとURDFを見る	https://qiita.com/Manyan3/items/ebfcb4e69b6c3638b772	httpsqiita	2023-08-25 17:26:26
AWS	AWSタグが付けられた新着投稿 - Qiita	TerraformでAWS Lambdaをデプロイする方法	https://qiita.com/curlneko/items/15607f8ef319cc97a75e	awsiam	2023-08-25 17:26:30
golang	Goタグが付けられた新着投稿 - Qiita	Goにおけるポインタの使い方と使い所のブラッシュアップ	https://qiita.com/naofunky/items/0ef32263979f0b870b42	疑問	2023-08-25 17:27:36
Git	Gitタグが付けられた新着投稿 - Qiita	azure DevOpsを用いたgit操作	https://qiita.com/pi-man/items/ba75b6692e34d4408e09	azure	2023-08-25 17:35:26
海外TECH	DEV Community	Data Annotations in C#: Your Complete Guide	https://dev.to/bytehide/data-annotations-in-c-your-complete-guide-50p1	Data Annotations in C Your Complete GuideLet s be sincere we ve all faced challenges while managing data in C haven t we But what if I told you there s a tool in C that might help you with data validation effectively Yes you guessed it Our topic of interest today is data annotations in C Let s dive in and explore this amazing feature together Understanding Data Annotations in C “We are not just dealing with code we need to communicate in a language users understand Have you ever uttered these words That s exactly what they are for Display Name Annotations Display Name Data Annotation in C brings the amazing possibility of customizing display names for your data It s an ideal way to tailor your data presentation according to user friendly terms rather than tech jargon The Essentials of C Data AnnotationsData annotations in C are like power ups for your code They handle and authenticate data efficiently making your development process smoother In simpler terms data annotations are attributes you can place on a class definition in the NET Framework They add context and behavior allowing the NET runtime to execute additional processing such as providing validation around fields properties and classes These annotations have a wide range of applications and benefits public class Order Key public int OrderID get set Required ErrorMessage CustomerName is required StringLength ErrorMessage CustomerName cannot be longer than characters public string CustomerName get set RegularExpression d d ErrorMessage Invalid total Range ErrorMessage Total must be between and public decimal Total get set In this code snippet the Order class has three properties OrderID CustomerName and Total The Key annotation is placed on the OrderID property earmarking it as a unique identifier The Required and StringLength annotations applied to the CustomerName property ensure the field is not empty and its size doesn t exceed characters The RegularExpression and Range annotations on Total enforce number specific validation Display Name Data Annotation in C C data annotations offer customization options as well Display names of data properties can be tailored to the programmer s needs Ever wondered if you could make data property names more user friendly or standardize them across your entire application You will be glad to learn that with display name data annotation in C that s absolutely possible Consider a scenario where you are developing a Human Resources application The users are HR experts not necessarily tech savvy or familiar with programmer jargon It would be much friendlier to present Employee ID instead of EmpID wouldn t it Here s how to implement it with data annotations public class Employee Customizes the display name for the property Display Name Employee ID public string EmpID get set Display Name Date of Joining public DateTime DoJ get set Display Name Is Permanent Employee public bool IsPermanent get set In the code above we ve used the Display attribute to provide user friendly text for the EmpID DoJ and IsPermanent properties So instead of displaying the bare property name of EmpID DoJ and IsPermanent the end user will see the meaningful and user friendly labels Employee ID Date of Joining and Is Permanent Employee Maximizing the Use of Maxlength Data Annotation in C Many troubles can arise while entering data and sometimes these may trace back to a quite simple mistake like typing too many characters It may sound trivial but such issues if left unresolved can harm the executable program during runtime and even hinder the user experience considerably However fret not Luckily the maxlength data annotation in C is here to save us all This feature is straightforward but highly effective assuring that your data stays within the set boundaries It restricts the maximum length of a string and helps prevent potential overflow and validation errors Definitely maxlength data annotation in C is a tool we should all master and guess what The learning curve is rather gentle Applying MaxLength Data Annotation in C How about we roll up our sleeves and dig a bit deeper into maxlength data annotation in C with some practical examples Surely there s no better way to learn than a hands on approach right Starting with a classic validate username input in a registration form You don t want your users to go wild with their usernames do you Let s impose a limit of characters for usernames Here s how public class Registration MaxLength ErrorMessage Username cannot exceed characters public string UserName get set As seen above the MaxLength annotation is being used to limit the UserName field to a maximum of characters If any eager user tries to register with a longer username the attribute will trigger the error message But wait there s more Let s consider another example a product code Every product has a unique code However for simplicity in inventory management you don t want codes that are over characters long With MaxLength data annotation you can again enforce this rule with ease public class Product MaxLength ErrorMessage Product code cannot be longer than characters public string ProductCode get set In this case the annotation ensures that the ProductCode value contains a maximum of characters enforcing the rule consistently throughout your application If anyone attempts to enter a code exceeding characters the system will stop them with the pre set error message Not just input fields maxlength data annotation in C also becomes particularly handy when working with databases Ensuring your string length matches your database schema can prevent runtime exceptions and maintain data integrity Here s how you can do it public class Employee MaxLength ErrorMessage Employee names should be within characters public string EmployeeName get set In this example EmployeeName is restricted to characters ensuring it matches the corresponding database column s length If any name longer than characters is attempted to be saved it ll raise a red flag The use of maxlength data annotation in C does not stop at restricting user inputs or maintaining database integrity It extends to enhancing performance by lowering memory consumption and assisting in faster data retrieval By restricting the length of data you end up storing only what is necessary thus enhancing your application s overall performance Therefore maxlength data annotation in C is a way of weaving commandments into your data models It s a good practice to get into It “keeps your characters in character so to speak Email Address Data Annotation in C Validations are like gatekeepers they ensure the correctness of user inputs to build reliable applications Email addresses being common entities in almost every application are often a nightmare to validate correctly due to their complex nature comprised of local parts symbol domain names and dot extensions But fret not NET has made this task easier for us with the built in email address data annotation C It s time to pop the hood and investigate the mechanics of this significant feature When it comes to validating the patterns regex is one of the first things that pops into our heads right But sometimes the complexity of regex can feel like untangling a ball of string Email data annotation attribute insulates you from this unraveled complexity After all why take the long road when you have a short one Perhaps you might be asking “What s the beef with this feature Why should I use it The benefits are multi fold it ensures your database integrity offers an enhanced user experience by providing immediate feedback and protects your application from bad data and potential security exploits Advanced Email Address Data Annotation C Let s dig deeper structurally Below is a typical sign up form model public class SignUp Validates the email address EmailAddress ErrorMessage Invalid Email Address public string Email get set Yes that s it The annotation EmailAddress keeps a tight check on user input It ensures that the string entered in Email is in a correct pattern i e username domain extension It automatically generates a regex validation routine leaving no chances for improperly formatted email addresses If the input deviates from the requisite format the user will get an ErrorMessage How about another example where users have an optional second email address You would want to validate it only when provided not when left empty public class SignUp Validates the primary email address EmailAddress ErrorMessage Invalid primary email address public string PrimaryEmail get set Validates the secondary email address only if provided EmailAddress ErrorMessage Invalid secondary email address SkipWhenEmpty true public string SecondaryEmail get set In the above code the SkipWhenEmpty property ensures validation is bypassed if SecondaryEmail is left empty during form filling See what did I tell you It does sound like a magical tool in your coding arsenal Don t get fooled by its simplicity though it s powerful and efficient The email address data annotation C can be your silent coding ally helping you maintain data hygiene in your beloved applications Exploring Data Annotation Attributes in C Did you know C data annotation attributes are like the secret sauce that can add flavor to your data handling process These attributes enable you to validate input data control data layout or adjust display details for smoother end user interactions Let s further understand this with more examples and information Common Data Annotation Attributes in C To help you get started here are some of the widely used data annotation attributes Required The field under this attribute must hold a value An empty input is not accepted StringLength Controls the maximum length of a string Range Enforces that the value of a property must fall within a specified range Compare Compares two properties of a model DataType Specifies the type of data like Email Phone Number etc that the property holds Let s see how these attributes function in reality public class EmployeeModel Required ErrorMessage Please enter name StringLength Display Name Employee Name public string Name get set Range ErrorMessage Age must be between and public int Age get set Required EmailAddress Display Name Email Address public string Email get set Required Compare Password ErrorMessage Password and Confirmation Password must match public string ConfirmPassword get set Required public string Password get set In the above snippet we have used different annotation attributes for different properties The Name property must be a string that is characters long presented as Employee Name the Age must be between and Email will be validated to ensure it holds a valid email format Password and ConfirmPassword must match Combining MaxLength and Display Name AnnotationsAt times you may find yourself in a situation where a single data annotation attribute is not enough What do you do then Combine them Let s consider an example of a Student class where we need to enforce a maximum length for the Name property and also have a customized display name for it Here s how we do it public class Student MaxLength Display Name Student s Full Name public string Name get set In this code the Name property is not going to accept more than characters and will be displayed as Student s Full Name in the UI This approach helps maintain data consistency and readability making your code far easier to manage how about that for coding convenience Why Stop at One Multiple Attributes on a Single PropertyC Data Annotations are all about providing versatility and flexibility Therefore it s not surprising that it allows you to apply multiple annotations onto a single property Let s say we have a Username field which requires uniqueness has a max length limit and needs to have a custom display name We can accomplish this easily with data annotations public class User Required MaxLength ErrorMessage Username cannot exceed characters Display Name User Handle DataType DataType Text public string Username get set With the help of multiple annotations Username is now a required property with a length limit of characters a custom display name as User Handle and it is expected to hold text data only C Data Annotations Date Greater ThanSometimes programming feels like a time travel adventure especially when dealing with date validations With C data annotations date greater than life becomes a lot easier This feature plays a critical role in ensuring your date validations are properly ordered and managed Consider this example you re working on a project management app where it s crucial to ensure the task start date is always earlier than the end date Let me show you how to magic this problem away with a nifty annotation Before we dive into the code let s understand the concept deeper We don t have a built in attribute to compare two date properties but don t despair C got us covered We can create our custom validation attribute for this purpose public class DateGreaterThanAttribute ValidationAttribute private readonly string comparisonProperty Set the name of the property to compare public DateGreaterThanAttribute string comparisonProperty comparisonProperty comparisonProperty Validate the date comparison protected override ValidationResult IsValid object value ValidationContext validationContext var currentValue DateTime value var comparisonValue DateTime validationContext ObjectType GetProperty comparisonProperty GetValue validationContext ObjectInstance if currentValue lt comparisonValue return new ValidationResult ErrorMessage End date must be later than start date return ValidationResult Success This custom attribute can be used to perform a date property comparison It fetches the comparison property from the ValidationContext instance and performs a simple “greater than check If the end date is earlier than the start date it throws a validation error Now let s see this superhero in action public class Task public DateTime StartDate get set DateGreaterThan StartDate public DateTime EndDate get set In the above snippet the EndDate attribute verifies that it is indeed later than the StartDate C Get Data Annotations from PropertyLet s further simplify our coding life with this next trick fetching data annotations from properties In the data annotation world we often want to validate input based on the property s annotation Let s break down how to ace this Suppose we re building a dynamic form where properties hold the critical validation information These annotations can tell us required field information min and max lengths or any custom validation rules Here s a chunk of code to demonstrate it public class DynamicForm Required MaxLength public string FirstName get set Required EmailAddress public string Email get set public void FetchAnnotations var form new DynamicForm var type form GetType foreach var property in type GetProperties var requiredAttr property GetCustomAttributes typeof RequiredAttribute false var emailAttr property GetCustomAttributes typeof EmailAddressAttribute false Console WriteLine Property property Name Console WriteLine Is required requiredAttr Length Console WriteLine Is email emailAttr Length Running the FetchAnnotations function will print out the property names along with whether they have the Required and EmailAddress data annotations Time is slipping away and now you may think “What if I don t use data annotations in C well you are missing out on an effective way to validate data at the model level making your coding life easier faster and more efficient	2023-08-25 08:37:49
医療系	医療介護 CBnews	コロナ新規患者報告数、41都道府県で増加-厚労省が第33週の発生状況を公表	https://www.cbnews.jp/news/entry/20230825154014	医療機関	2023-08-25 18:00:00
金融	ニッセイ基礎研究所	収まらない円安、一体いつまで続くのか？～マーケット・カルテ９月号	https://www.nli-research.co.jp/topics_detail1/id=75898?site=nli	一方、円超の領域では政府・日銀による介入への警戒感が高まったうえ、米景況感の悪化がドルの上値を抑えたことで、足元では円付近で推移している。	2023-08-25 17:09:56
ニュース	BBC News - Home	The Crown producers promise to handle Princess Diana death delicately	https://www.bbc.co.uk/news/entertainment-arts-66613997?at_medium=RSS&at_campaign=KARANGA	netflix	2023-08-25 08:11:49
ニュース	BBC News - Home	Bray Wyatt: WWE champion dies aged 36	https://www.bbc.co.uk/news/entertainment-arts-66613784?at_medium=RSS&at_campaign=KARANGA	wyatt	2023-08-25 08:34:02
ニュース	BBC News - Home	Murder arrests as Bury man found dead after 'dog theft'	https://www.bbc.co.uk/news/uk-england-manchester-66607053?at_medium=RSS&at_campaign=KARANGA	donald	2023-08-25 08:38:35
ニュース	BBC News - Home	Train strikes to hit major events like Reading and Leeds festivals	https://www.bbc.co.uk/news/business-66604271?at_medium=RSS&at_campaign=KARANGA	workers	2023-08-25 08:25:40
ニュース	Newsweek	「服着てる？」ほぼ全裸の衝撃露出...カニエ・ウェスト妻の街ブラ姿にネット驚愕	https://www.newsweekjapan.jp/stories/culture/2023/08/post-102488.php	「服着てる」ほぼ全裸の衝撃露出カニエ・ウェスト妻の街ブラ姿にネット驚愕大物ラッパーのカニエ・ウェストの妻であり、建築デザイナーとしても知られるビアンカ・センソリは、月には目を疑うような過激衣装でサンリオピューロランドに登場した。	2023-08-25 17:30:00
ニュース	Newsweek	墜落したプリゴジンの航空機に搭乗...「客室乗務員」が、家族に送っていた「最後」のメールと写真	https://www.newsweekjapan.jp/stories/world/2023/08/post-102486.php	墜落したプリゴジンの航空機に搭乗「客室乗務員」が、家族に送っていた「最後」のメールと写真ロシアの民間軍事会社「ワグネル」の創設者エフゲニー・プリゴジンを乗せていたとみられるプライベートジェット機が墜落し、ロシア当局は乗員乗客人全員が死亡したと発表した。	2023-08-25 17:04:00
IT	週刊アスキー	テーマは“盗み”！『フォートナイト』チャプター4シーズン4「LAST RESORT」が本日開幕	https://weekly.ascii.jp/elem/000/004/152/4152192/	epicgames	2023-08-25 17:55:00
IT	週刊アスキー	“俺の影でも踏んでろ” 自分に似たブルーロックキャラが分かる「エゴイスト診断」公開中	https://weekly.ascii.jp/elem/000/004/152/4152161/	公式サイト	2023-08-25 17:45:00
IT	週刊アスキー	新宿十二社 熊野神社は9月17日に大祭式典を実施、先立つ9月16日は宵宮も開催	https://weekly.ascii.jp/elem/000/004/152/4152086/	熊野神社	2023-08-25 17:15:00
IT	週刊アスキー	TORICO、マンガ展 池袋にてアニメ「わたしの幸せな結婚」コラボカフェを開催	https://weekly.ascii.jp/elem/000/004/152/4152158/	torico	2023-08-25 17:30:00
IT	週刊アスキー	デル、ASH WINDER Esports ARENA 高田馬場店にAlienwareを導入	https://weekly.ascii.jp/elem/000/004/152/4152129/	alienware	2023-08-25 17:45:00
IT	週刊アスキー	リンクス、microATX対応ミニタワーPCケースのホワイトモデル「Antec NX200M WHITE」を8月26日発売	https://weekly.ascii.jp/elem/000/004/152/4152152/	antecnxmwhite	2023-08-25 17:30:00