linq c# tutorial

21.5.7 anonymous type in Query 21.5.8 group clause 21.5.9 query continuation 21.6 standard query Operators 21.6.3 delegate as parameter 21.6.4 pre-defined delegation type of LINQ 21.6.5 example of using delegate Parameters 21.6.6 example of using Lambda expression Parameters 21.5.7 anonymous type in Query Select New {S. lastname, S. firstname, S. Major }; 21.5.8 group clause The Group clause groups select obje

LINQ to datasets require the use of System.Core.dll, System.Data.dll and System.Data.DataSetExtensions.dll, add references System.Data and System.Data.DataSetExtensions to the project.1. DataTable Read ListDataSet ds = new DataSet ();//Omit the DS's fill code datatable products = ds. tables["Product"];ienumerableDataSet ds = new DataSet ();//Omit the DS's fill code datatable products = ds. tables["Product"];var rows = products. AsEnumerable () . Se

1. Create two Relational Tables, student and class tables. Students and course schedules, as shown in the example. 2. Create a form in vs2010. And writeCodeAs follows: Namespace Linqtest{ Public Partial Class Frmmanytomany: Form{ Internal Static String Sqlconstr = @" Data Source = localhost; initial catalog = lxpower; user = sa; Pwd = " ; Public Frmmanytomany (){Initializecomponent ();} PrivateVoidFrmmanytomany_load (ObjectSender, eventargs E){Binddata ();} Private Void

C #3.0 LINQ ing of the LINQ database table [add this page to favorites] [print] Author: ITPUB Forum2008-01-17 Content Navigation: OverviewPage 1: Overview Linq to SQL is a database application of LINQ technology. Database technology from OLEDB, odbc to ado, to ado. net to t

C # conversion between Dto Linq Expression and Model Linq Expression in the database in ORM, Today, I saw a question in Baidu zhixing. After studying it for a while, I answered: Http://zhidao.baidu.com/question/920461189016484459.html How to convert a dto linq expression to a database object

Hi: The following is a LINQ to JS share, if there is a coincidence is purely coincidental(function () {Array.prototype.first = function (predicate, def) {var l = this.length; if (!predicate) return l? This[0]: def = = null? Null:def; for (var i = 0; i How to use: List.first (function (t) {return T.value.trim () = = City.trim ();});　　JS simulation expands C #

]);}var New int 1 1 2 3 5 8 - + }; foreach (varin fromwhere5Select f) { Console.WriteLine (number);}1.3 Anonymous types and usingusing var New SqlConnection (connectionString)) { connection. Open (); // ......}2. Array initializerInitializes the array with the keyword new.var New int 1 1 2 3 5 8 - ;3. Anonymous generic methodsfuncLong,Long> factorial =Delegate(LongN) { if(n = =1) { return 1; } Longresult =1; for(inti =2; I ) {result*=i; } returnresult;}; Cons

To enable LINQ to be seamless and integrated with the C # language, Microsoft has added new features to c#3.0, which focuses on enhancing LINQ-related. 1, the VAR keyword, collection initialization, and anonymous types 2. LAMBDA expression 3. Partial (Partial) method 4. Extension method 5. Expression tree 1, the

LINQ via C # Recently I am giving a series of talk on LINQ. the name "LINQ via C #" is copied from "CLR via C #", one of my favorite books. currently Part 1-8 are finished, and the entire series shocould be 10 parts. the contents

easily. Remember when I study, a look I go to the hql of another form? Of course hql is not LINQ or learning. It's no use talking so much. It is best to use a few.First, build EF environment. build a project first, and then get the corresponding EF DLL through NuGet. For what NuGet is. I believe that people who have read the Java attack on c#--project development environment should be able to understand. S

Titan "," Query ":" Attacking Titan "," Amount ":" 20358 "," Delta ":"},16 "," name ":" Who's youth is not missing "," Query ":" Whose youth is not missing "," Amount ":" 17441 "," Delta ":" 581 "},17 {" name ":" I love Lucky Seven "," Query ":" I love Lucky Seven "," Amount ":" 15051 "," Delta ":" 255 "},18 { "Name": "Motherly 10 Square", "Query": "Motherly love 10 square", "Amount": "14027", "Delta": "453"}19]20},21 "as_of": 136998189822}One of the "2013-05-31 14:31" is the change of key, how

Language Integrated Query. Many people are familiar with the SQL language and it is very convenient to use it to operate the database. Now, in C #3.0, you can use the same syntax to operate various types of data, including arrays, files, and databases. As there are many things in LINQ, I want to talk about it three times. For the first time, I will mainly talk about LIN