linq extension methods

Address: http://eallies.blog.51cto.com/375118/79022 The extension method is a technical highlight in. NET 3.0. It allows us to customize the extension of some object methods. In this way, we can call a function as a call similar to object. ToString.The following describes how to extend the ListView control.1. GetItem and IsInRow.GetItem and IsInRow are two simila

Make the extension method, easy to use in the Web page, the following two examplesusingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Linq.Expressions;usingSystem.Text;usingsystem.web;namespacesystem.web.mvc{ Public Static classCheckboxlisthelper { Public StaticMvchtmlstring CheckBoxList ( ThisHtmlHelper Helper,string[] Showstr,stringAttrname,BOOLIshorizon =true) { if(Showstr = =NULL) return NULL;

Call method Call Method: $ ("#apDiv"). Setapdiv ();Jquery.fn represents a jquery built-in function that can be manipulated directly using jquery objects;JQuery app Extension Jquery.extend ({//Set Apdiv setapdiv:function () {//apdiv floating Layer Display Location Center control var wheight=$ (window). height (); var ww idth=$ (window). width (); var apheight=wheight-$ ("#apDiv"). Height (); var apwidth=wwidth-$ ("#apDiv"). width (); $ ("#apDiv"). CSS

PHP Tutorial Get file extension two effective methods $upload _name = ' Www.111cn.net.rar '; $attach _ext = Strtolower (substr (STRRCHR ($upload _name, '. '), 1)); echo $attach _ext; Method Two $extarray = Explode ('. ', $upload _name); if (Is_array ($extarray)) { $ext = End ($extarray); Echo $ext; } /*In the file upload process we often need to get the upload file

Method One:function get_ext1 ($path) { returnstrrchr($path, '. ') Echo get_ext1 (__file__);Method Two:function get_ext2 ($path) { returnsubstr($path, Strrpos($path, '. ') Echo get_ext2 (__file__);Method Three:function get_ext3 ($path) { $resultpathinfo($path); // return$result[' extension 'var_dump(Get_ext3 (_ _file__));Method Four:function get_ext4 ($path) { $resultexplode$path); return $result [Count($result)-1echo get_ext

Sometimes we need a method, but. NET does not provide, we need to write an extension method1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 usingSystem.Threading.Tasks;6 7 namespacecstest8 {9 Static classKuozhanTen { One Public Static stringSe This stringd) A { - returnD.remove (0,2); - } the Public Static stringIsou ( This intDS) - { - if(ds%2==0)

I keep using this brand new feature shipped by C #3.0 a lot since last two years. Some guys doubt its performance when comparing it to the regular. net static method, they don't do any tests but just keep away from the new things... IMHO, they are little flock of sheep! In fact, there is no need to think too much on the performance when using C #'s extension methods, which is the case of the core language

varwheight=$ (window). Height (); varWwidth=$ (window). width (); varapheight=wheight-$ ("#apDiv"). Height (); varapwidth=wwidth-$ ("#apDiv"). width (); $("#apDiv"). CSS ("Top", apheight/2); $("#apDiv"). CSS (" Left", apwidth/2); } }); Or: (function ($) {$.extend ({//pop-up window masking layershowloaddialog:function () {//Set Apdivsetapdiv:function () {//Apdiv Floating Layer display position centering control varwheight=$ (window). Height (); varWwidth=$ (window).

The extension method of the IEnumerable interface, the implementation class that supports it is the case of listUsing System.Collections.Generic;public static Class Ienumerableextensions{Adding elements to the collectionpublic static void Add{(collection as list}Remove an element from the collectionpublic static void Remove{(collection as list}Retrieves whether an element is contained in the collectionpublic static bool Contains{Return (collection as

I have talked a lot about how to get the extension name of a file. Today we will summarize how to use different functions to obtain the extension name. If you need it, please refer to it. One, php explode function, function usage reference http://www.bKjia. c0m/phper/24/f486bb8b0528a628528530b295e6281b.htm The Code is as follows: Copy code $ Pic = 'abc. php ';$ Pics = explode ('.', $

Unity3d C # extended method Extension methods application, Extension Method conditions: Must be declared as a static class Must be declared as a static method The first parameter of the method is this First, expand the Coroutine in Unity, using UnityEngine;using System.Collections;using System;/// Extend the content of the Transform component, especial

(); + foreach(varPropertyinchdestinationtype.getproperties ()) A { atMap. Formember (property. Name, opt + = opt. Mapfrom (s = =Reflex (S, property))); - } - - }); - } - in Private Static ObjectReflex(TSource source, PropertyInfo property) - { to returnDefaultfortype (source, property); + } - the Private Static ObjectDefaultfortype(TSource source, PropertyInfo property) * {

GZIP (Gnu-zip) is a compression technique. The page size can be turned into 30% or smaller after gzip compression. This way the user will feel very happy when browsing! Preparatory work 1, can not find the Php_zlib.dll file? Since the php4.3 began zlib compression has been built into PHP, so at least in the Windows environment is not required to install zlib. 2. Install and build PHP operating environment Because the light through the php.ini configuration file to open the gzip configuratio

classMystack{t[] stackarray; Public intLength; intStackpointer; Public stringPrintstring (stringa) {returnA; } Public BOOLIsEmpty {Get { returnStackpointer = =0?true:false; } } Public BOOLIsfull {Get { returnStackpointer >= Length?true:false; } } PublicMystack (int_length) {Length=_length; Stackarray=NewT[length]; Stackpointer=0; } Public voidPush (T _value) {if(Isfull) {Console.WriteLine ("Stack

Problem descriptionA custom pagedlist is implemented in the system.Conversion failed, AutoMapper don't know pagedlist[TestMethod] public void MapTest2 () {mapper.createmapSolution Solutions Test Pass[TestMethod] public void MapTest2 () {mapper.createmapSummarizeThe runtime dynamically acquires generic parameters and executes mapper.mapAutoMapper extension methods

In general, we have a lot of data transmission mechanisms to reduce the bandwidth pressure on the server. We will adopt a method to compress file transmission. in php, zlib can also achieve gzip compression output, the following is a summary of GZIP compression output methods. GZIP (GNU-ZIP) is a compression technology. After GZIP compression, the page size can be changed to 30% or even smaller. In this way, users will feel very happy when Browsing! P

Implementation function: If it is a number, add it directly; if it is a string, stitch it up; if both, then stitch the string behind the number.If this method already exists, assign the value directlyArray.prototype.sum = Array.prototype.sum | | Function (argument) { var sum; if (typeof argument = = ' number ') { sum = 0; } else { sum = '; }Use arguments wisely (if you don't understand what arguments means, you can see its effect first) for (var i =0;i Sum +

Several useful extension methods: Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Public Static Bool Isnullortrimempty ( This String Value) {ReturnValue=Null|Value. Trim (). Length=0;} Public Static Bool Isnullortrimempty ( This Httpcookie) { Return Cookie = Null | Cookie. Value = Null | Cookie. val

Methods and questions about using the jquery extension uploadify to upload files, jqueryuploadify I am a student, and my major is not a computer, but I need to use a lot of related technologies. So I am working hard when the technical foundation is poor. Recently, a small project needs to upload images, and ajax is required. However, the ajax method using jquery always has the "C:/fakepath" problem. I have

=>v.score). Distinct (); foreach (var in query2) { Console.WriteLine (ST);}Execution Result:Take to remove the specified number// query Top 3 records Console.WriteLine ("===== the previous records =========="); var query3 = db. Student.take (3); foreach (var in query3) { Console.WriteLine (St. StudentID+""+St. Studentname);}Skip skips a specified number// Skip Top 3 Records Console.WriteLine ("====== skips previous n records ======="); var query4 = db. Student.orderby (V=>v.studentid). Ski