linq extension methods

Thoughts on generic classes and extension methods We often use generic constructors to create generic instances and call extension methods of instances. The following code is everywhere in the project: static void Main(string[] args) { var strs = new List var result = strs.Where

We often create generic instances through generic constructors, and we often call extension methods for instances. The following code is ubiquitous in the project: static void Main (string[] args) { var STRs = new Liststring> {"Hello", "World"}; var result = STRs. Where (s = = S.startswith ("h")); foreach (var item in result) { Consol

Extension methods can "add" a method to a class without modifying the original class's code. Although the extension method is static, the syntax of the call is similar to the object invocation. The extension method is demonstrated directly using an example.First, prepare a class in which there is no method we want to e

During the MVC development process, it was found that some custom methods were needed in the view, and the previous development in Webfrom was to use a static class that was used to edit many of the frequently used methods in the solution. It is now found in MVC that you can customize the extended HtmlHelper method as follows:1. Create a new classYou can add a folder to your project named helpers, where you

. Controls. Cast 4 // obtain all the selected checkboxes 5 var checkboxes = (this as control). getdescendants ( 6 c => C. Controls. Cast 7 C => (C is checkbox) (c as checkbox). Checked 8) 9. Cast General Methods certainly do not have dedicated elegance in writing, and multiple is/As and cast are used, mainly because inheritance is involved here, and the type controlcollection of the Control. CONTROLS attribute is not a generic set. The preceding two

Extension of custom methods in jQuery. The JQuery package provides a large number of methods that can be directly used on the page. However, no Any library can meet all requirements. Therefore, the JQuery Library provides a wide range of extension functions. . Take disabling a group of form elements as an example to se

1. Enable IIS to support aspx and add web service extension methods Open IIS, go to the local computer, right-click "default website", click "all tasks", and click "add web service extension". In this way, Web Service extension is available, this IIS also supports ASPnet. If the Web service

It is easy to extend an existing class in C #, for example: Public static class utils {public static void printtoconsole (this string strsrc) {console. writeline (strsrc );}} In this way, a printtoconsole method is added to the string class. The usage is as follows: Class mainclass {public static void main (string [] ARGs) {"Hello world! ". Printtoconsole ();}} In objective-C, there is a similar solution: stringutils. h definition section # Import Explanation: @ interface nsstring (extnsst

This article describes the MFC extension DLL to export Classes and dialog box implementation methods, shared for everyone to reference. The implementation methods are as follows: In general, if you want to write modular software, you must have a certain understanding of dynamic link library (DLL), I this time in the modification of the previous software, decided

be said that these two methods are the extension of includes method; Let str= ' Google '; Console.log (Str.startswith (' G ')); True Repeat the Lazy man welfare As the name suggests, this method is to get the string repeated n times after the method; Let str= ' Google '; Console.log (Str.repeat (3)); Googlegooglegoogle The Repeat method accepts an argument of a numeric type, whi

a new feature after. NET 3.0, called the extension method extension method, is the ability to "add" methods to an existing type without creating a new derived type, recompiling, or otherwise modifying the original type.An extension method is a special static method, but it can be called just like an instance method on

init , just like the following.(function () { function init () { console.log (' Execute init ... '); } Init ();}) ();When we introduce custome.js in HTML: the self-executing function executes immediately and executes the internally defined init function;However, the self-executing function immediately executes the attribute, making it difficult to invoke. By defining the jquery extension method, you can solve this problem and get the

Extension methods are defined as static methods, but they are called through the instance method syntax. Their first argument specifies which type the method acts on, and the parameter is prefixed with the This modifier.The extension method specifies that the class must be a static class, and all of the

Class method The essence of a class method is a single piece method that lives in a single piece of the class. There are three ways to define them, respectively: # method One def Myclass.a_class_method end # Two class MyClass def self.anther_class_method # Method III * class MyClass class The third way out, the essence of the class method, special memory! Class extension Class extensions define class

Five methods to get the file extension-reprinted unverified, five file extensions In PHP interviews, I often encounter this question: I need to write more than five methods to obtain the extension of a file. In fact, I am also examining the basic knowledge of the interviewer, the following describes several common

C # code reconstruction using model and extension methods, cfC # code reconstruction using model and extension methods It is often seen in some C # codeJava code // An Simple Example By Ray Linn Class CarCollection: ICollection { IList list; Public void Add (Car car) { List. Add (car ); } ... Function list

How to solve the problem of "no PHP extension settings mbstring ..., I tried several methods on the Internet, but I didn't find the extended settings of nbsp; PHP nbsp; mbstring, nbsp; and the current system seems to be using the wide character set. No nbsp; mbstring nbsp; Extended nbsp; phpMyAdmin nbs how to solve this problem: "I didn't find PHP extension