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In Microsoft's standard Linq, there is no DistinctBy extension or ForEach extension, but these two functions are often used in daily work. In theory, microsoft should include these two extensions in Linq. But why not? In this article, I will talk about my understanding of these two extensions! About DistinctBy Extension As the name suggests, the DistinctBy

Several instances of the extension method, such as extending basic types, interfaces, and using reflection to allow the extension method to use private members. The. net extension method can expand many types, including basic data types, interfaces, classes, and so on. If the type to be extended includes private members, how can the

The following code is a php file extension judge Check fileFile name extension validation n ways to get file name extensions in PHP Basically there are several ways to do this: The 1th method: function Get_extension ($file) {substr (STRRCHR ($file, '. '), 1);} The 2nd method: function Get_extension ($file) {return substr ($file, Strrpos ($file, '. ') +1);} The 3rd method: function Get_extension ($fi

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.First, describe the definitions of the two extensionsTurn http://blog.csdn.net/jaylong35/article/details/6160736Symbol extension: When storing a signed number with more memory, since the sign bit is in the first bit of the number, after the expansion, the sign bit still needs to be in the first place, so when you extend a negative, you need to fu

Detailed description of Array object extension and String object extension in JS, arraystring If you don't talk much about it, just add the array object extension code to everyone. The specific code is as follows: /*** Created by laixiangran on 2016/01/07. * Array Extension */(function () {// traverses the Array if (ty

The purpose of the class and extension is to extend a class.Category (category) in the Objective-cI. Definition and role of class purposeCategory is also called classification, the English category, in the absence of the original class. m file based on, to add methods to the class.For example, NSString class originally did not have hellostring method, we do not have nsstring class of original code, then we want to add a hellostring method to the NSStr

The SQL Server 2014 cache Pool Extension (Extension) feature allows you to extend the cache pool to faster SSD storage. Provides a new way to extend the memory-intensive system.The Buffer Pool extension can provide the following benefits: Increase the throughput of random I/O Reduce I/O latency Increase throughput for processing transactions per

I. Mcrypt introduction Mcrypt is an extension of PHP, which encapsulates common encryption algorithms. In fact, the extension is the encapsulation of mcrypt standard class library, mcrypt completed a lot of common encryption algorithms, such as DES, TripleDES, Blowfish (default), 3-WAY, SAFER-SK64, SAFER-SK128, TWOFISH, TEA, RC2, and GOST encryption algorithms, I. Mcrypt introduction Mcrypt is an

This morning I saw this article at the MSDN site: The Evolution of C # 3.0 LINQ and its impact on C # design. From this article we can see clearly that the new features that are added to C # 3.0 can be considered for the development of LINQ, some of the new features that are created for LINQ, and of course those features that can be used by non-LINQ-related features. The development of LINQ has led to the emergence of a series of new features of c#3.0. Come back to our topic,

Determine the php file extension and obtain the file extension in N ways ,. Php file extension determination and obtaining of file extension N methods, the following code is php file extension judgment! DOCTYPEhtmlheadmetahttp-equivContent-typecontenttexthtmlcharset N method

Open php Exif extension method in detail, phpexif extension of the detailed Server Configuration Description: 1. Locate in the php.ini file; extension=php_exif.dll, remove the preceding semicolon2. Locate in the php.ini file; extension=php_mbstring.dll, remove the preceding semicolon, and move the line to

Install the xdebug extension and phpxdebug extension in php. Php install xdebug extension, phpxdebug extension php extension get address pecl. php. netpackage compilation installation process wgetpecl. php. netgetxdebug-2.2.2.tgztar-zxvfxdebug-2.2 php install xdebug

First, master the use of nsdate and NSDateFormatter nsdate is cocoa? The base class for working with dates and times, encapsulating a givenTime (including date, times, timezone). Learn about the creation of NSDate, how to calculate the current time, the time interval, and the interaction between the time date and the character. 1>. NSDate creation, local time calculation, time interval calculation, time-to-character inter-transferExercise 1: Calculate the time difference between the curre

Principles and Rules that need to be paid attention to about the extension method, and rules for extension C # Only extension methods are supported. Extension attributes, Extension events, and extension operators are not suppor

PHP Encryption Extension Library-mhash extension Library What is the Mhash extension library: Mhash is a non-reversible PHP encryption extension library based on discrete mathematical principles, which is not turned on by default. Mhash can be used to create checksum values, message summaries, message authentication c

Follow the tutorials below:Lamp One-click installation package-centos 5/6 automatically compile and install Apache, MySQL, PHPIn the virtual machine's CentOS5.5, the PHP runtime environment was installed with one click, but no SOAP extension was found, and the recent project needed to use WebService.The above one-button installation (lamp0.4), is actually the source code compiled installation, PHP configuration file path is /etc/php.ini , after instal

to emphasize here is that there are only a few symbols in Java! There are only signed numbers in Java! There are only signed numbers in Java! Important thing to say three times!Well, the value stored in Java is like this big disk!Let's see why output 129? It is known that the byte after calculation will become an int, but someone else int is 32 bits of Ah, byte is only 8, so can only fill the place, eh ah, the question comes, how to fill it? This is what I want to emphasize today!B is a byte ty

After the LAMP configuration environment is completed in linux, you can perform php extension development. Extension development in php is under the ext folder of the source code package. we can see that there are already many well-developed extensions. For example, mysql and xml processing modules related to databases. After the LAMP configuration environment is completed in linux, you can perform php

PHP extension development series in Linux: 2. after reading some of the content in the preface, you should have a general understanding of PHP extension development. some people may think that development expansion is very complicated and complicated, this is actually not the case. in this article, we quickly enter the role and develop our first extension. I

This article was reproduced from: http://blog.csdn.net/zxz414644665/article/details/9793205When you have a requirement like this, the extension will work: In the project, Class A needs to add functionality, and we think of adding a public method to Class A, which is obviously possible, but for some reason you can't modify the code of Class A itself, but it does need to add functionality to Class A, What to do? This time the