Language Integrated Query (LINQ, pronounced "link") is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages using a syntax reminiscent of SQL. Many of the concepts that LINQ has introduced...
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Language Integrated Query (LINQ, pronounced "link") is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages using a syntax reminiscent of SQL. Many of the concepts that LINQ has introduced were originally tested in Microsoft's Cω research project. LINQ was released as a part of .NET Framework 3.5 on November 19, 2007.
LINQ defines a set of query operators that can be used to query, project and filter data in arrays, enumerable classes, XML, relational database, and third party data sources. While it allows any data source to be queried, it requires that the data be encapsulated as objects. So, if the data source does not natively store data as objects, the data must be mapped to the object domain. Queries written using the query operators are executed either by the LINQ query processing engine or, via an extension mechanism, handed over to LINQ providers which either implement a separate query processing engine or translate to a different format to be executed on a separate data store (such as on a database server as SQL queries). The results of a query are returned as a collection of in-memory objects that can be enumerated. -- source www.wikipedia.org
I am trying to determine the success/failure of updating a record in my BLL using LINQ. My original method looked like this:
ASP Code:
public static bool UpdateApplication ( int applicationID, string name, string brief, string summary,
string url )
{
ServicePortalDataContext context = new ServicePortalDataContext ( ) ;
portal_Application_Application targetApplication =
( from queryApplication in context. portal_Application_Applications... Read Full Story
LINQ , Language INtegrated Query, is a new extension to the Visual Basic and C# programming languages designed to simplify data queries and database interaction. It addreses O/R mapping issues by making query operations like SQL statements part of the programming language. It also offers built-in support for querying in-memory collections like arrays or lists, XML, DataSets, and relational databases.
LINQ in Action is a fast-paced, comprehensive tutorial for professional developers. This... Read Full Story
Hey DotNetters,
Believe me, I have researched this topic before making this post. To many partisan talking-points, and no in-depth comparing to one another.
Ok, I have read on many blogs that Microsoft is planning on phasing out LINQ to SQL starting with the upcoming release of .NET in 2010 - and forward. For example, LINQ to SQL will be extinct in .NET 4.5 - and later. Is this based on facts? If so, their is no point learning LINQ to SQL, and should focus only on LINQ to XML, LINQ... Read Full Story
In this course, you’ll see to ingest the elating newborn .NET Framework 3.5 feature, Language Integrated Query (LINQ) to easily create Byzantine data-independent queries. In addition, you’ll see most the newborn module features additional to Visual Basic in Visual Studio 2008 in visit to attain LINQ possible. You’ll move by employed finished a hurried overview of LINQ, and how it applies to employed with collections of objects, retrieving accumulation stored in SQL Server, and creating XML... Read Full Story
So in typical tool fashion I posted this little gem without realizing a glaring error… the order by clause. The whole idea is to create a method that can get a collection, sort it, then grab a certain number for paging. The issue was this:
Expression < Func <K, IComparable >> orderBy
The problem comes in when the entire expression is run, meaning when Entity Frame work takes:
context.Select(selectMethod).Where(whereClause).OrderBy(orderBy).ToList();
and creates SQL out of it. Entity... Read Full Story
Ok, for the most part, it's not been hard. There's not a lot different really, and the syntax is a lot like other languages I've used. However, I have a question regarding automated get and set behavior.
In my VB app, I have a model defined like this:
Option Explicit On
Option Strict On
Imports System.Data.Linq.Mapping
Namespace Models.Domain.Entities
<Table(Name:= "dbo.Category" )> _
Partial Public Class CategoryEntity
<Column(DbType:= "Int NOT NULL IDENTITY" , IsPrimaryKey... Read Full Story
Ok, for the most part, it's not been hard. There's not a lot different really, and the syntax is a lot like other languages I've used. However, I have a question regarding automated get and set behavior.
In my VB app, I have a model defined like this:
Option Explicit On
Option Strict On
Imports System.Data.Linq.Mapping
Namespace Models.Domain.Entities
<Table(Name:= "dbo.Category" )> _
Partial Public Class CategoryEntity
<Column(DbType:= "Int NOT NULL IDENTITY" , IsPrimaryKey... Read Full Story
Ok, for the most part, it's not been hard. There's not a lot different really, and the syntax is a lot like other languages I've used. However, I have a question regarding automated get and set behavior.
In my VB app, I have a model defined like this:
Option Explicit On
Option Strict On
Imports System.Data.Linq.Mapping
Namespace Models.Domain.Entities
<Table(Name:= "dbo.Category" )> _
Partial Public Class CategoryEntity
<Column(DbType:= "Int NOT NULL IDENTITY" , IsPrimaryKey... Read Full Story
Ok, for the most part, it's not been hard. There's not a lot different really, and the syntax is a lot like other languages I've used. However, I have a question regarding automated get and set behavior.
In my VB app, I have a model defined like this:
Option Explicit On
Option Strict On
Imports System.Data.Linq.Mapping
Namespace Models.Domain.Entities
<Table(Name:= "dbo.Category" )> _
Partial Public Class CategoryEntity
<Column(DbType:= "Int NOT NULL IDENTITY" , IsPrimaryKey... Read Full Story
LINQ (Language INtegrated Query) is a newborn constituent to the .NET 3.5 Framework that Microsoft module be emotional alongside Visual Studio 2008 (previously codenamed ‘Orcas’) in Fall 2007. It is ordered to indoctrinate the artefact that database applications are constructed by providing developers with a accepted ordered of queries that they crapper compel in the aforementioned artefact disregarding of the data-source that they are employed with. Whether it’s an XML file, a aggregation... Read Full Story
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