linq extension methods

Yesterday, I talked to a friend in a PHP chat group (276167802, verification: csl. If you are interested, you can join in for discussion ).PHPYou can use the following six methods to obtain the file extension:1. string search and truncation Methods $ Extension = substr (strrchr ($ file, '.'), 1 ); 2. method 2 for s

The purpose of the extension method is to add a method to an existing type, such as the following code, which adds a method of turning into a shape for string strings.In this way, you can add some other methods to refine the code for many existing types.The following example shows the definition of an extension method to use. classProgram {Static voidMain (string

The extension method is actually adding an extension method to an existing type, which can be either an int, a string, a DateTime, or a custom type.An extension class can be added with the premise that the extended class must be a static class.In addition, the extension method must be a static method. So calling an

As the name implies, this is an operation that can extend the C # class, as the MSDN statement says:The extension method enables you to add a method to an existing type without creating a new derived type, recompiling, or otherwise modifying the original type. ”is usually used to extend the classes that we can't modify, such asString,int,datarow,datatable these.For example, a string type has a method called Contains, which can be used to test whether

Preface: When I look at the title, many of my friends may not know what I want to write. Writing this articleArticleI struggled with myself for a long time. Should I write this article? After all, from the perspective of realism, this article may fall into the ranks of "nonsense", because for most of my friends, all of the following extension methods may not be used. If this is the case, let's look at i

For a type, if we do not want to or cannot change it, but want to add a method for this type, we can use the extension method. If this type has a higher level of abstraction, such as an interface, we should compile an extension method for a higher level type. In addition, the extension method is the premise of chain programming. Determine whether a set contain

Extension methods (Extension method) are a convenient way to add methods to classes that are not owned by you and thus cannot be modified directly.1, define a shopping cart class-shoppingcart1 usingSystem;2 usingSystem.Collections;3 usingSystem.Collections.Generic;4 usingSystem.Linq;5 usingsystem.web;6 7 namespaceDemo.

Some time ago did a practiced hand small project, called Book_bar, used to sell books, using a three-tier architecture, that is, MODELS,IDAL,DAL,BLL and the Web, in the DAL layer in each class has a method is more commonly used, that is Rowtoclass, as the name implies, That is, the data in the DataTable is encapsulated into the Models. As a result, many similar methods were written in the Dal classes, which were then extracted directly into the DataTa

Turn http://blog.csdn.net/tuwen/article/details/11464693JS extension Method: 1 Define class static method extension 2 Define Class object method extensionvar aclass = function () {}1 defining static methods for this classAclass.sayhello = function () {Alert (' Say hello ');}2 Defining object methods for this class obje

Two methods for php to obtain the file extension This article describes a piece of php code used to obtain the file extension. it is convenient to use pathinfo () to obtain the extension in php. For more information, see.In php, you can easily obtain the file extension