2. WHAT IS LINQ
LINQ is known as Language Integrated Query .The beauty of LINQ is it provides the
ability to .NET languages(like C#,VB.NET, etc.) to generate queries to retrieve data
from the data source such as collections, ADO.Net DataSet, XML Docs, web service
and MS SQL Server and other databases.
L
I
N
Q
Object Collection LINQ to object
ADO.Net Database LINQ to dataset
SQL Database LINQ to SQL
Entity Frame work LINQ to Entities
Other data source
By implementing
IQueryable
Devloper
Uses Query
3. WHYWE USE LINQ
LINQ (Language-Integrated Query) simplifies working with collections in C#.
It replaces traditional loops and delegates with a more concise and readable query
syntax.
LINQ provides type checking at compile time, catching errors early in development.
The query syntax is easy to understand, improving code readability and maintainability.
LINQ can work with various data sources like XML, SQL, entities, objects, etc.
You can use a single LINQ query for different types of databases, no need to learn
different languages.
It is a powerful tool for effective data manipulation and problem-solving in C#
applications.
4. HOW DOES LINQWORK
understand how exactly the LINQ works in .NET Framework, please have a look at the
following diagram which shows how the LINQ works.
LINQ allows queries in
C#, VB.NET, J#, F#, etc.,
while the LINQ Provider
converts queries to
formats understandable
by data sources (e.g.,
LINQ to SQL for SQL
Server, LINQ to XML for
XML documents).
5. ADVANTAGE OF LINQ
Familiar language: Developers don't have to learn a new query language for each
type of data source or data format.
Less coding: It reduces the amount of code to be written as compared with a more
traditional approach.
Readable code: LINQ makes the code more readable so other developers can easily
understand and maintain it.
Standardized way of querying multiple data sources: The same LINQ syntax can be
used to query multiple data sources.
6. DISADVANTAGE OF LINQ
Required to recompile and redeploy whenever changes are made by
user.
Impact to performance, high network traffic usage.
No clear view of permission.
7. WAYSTOWRITE LINQ QUERY
In LINQ there are three ways to write query
Query Syntax
Method
Mixed Syntax(Query + Method)
In order to write a LINQ query, we need the following three things
Data Source (In-Memory Objects, SQL Server, XML Document, etc)
Query
Execution of the Query
8. Query Syntax
This is one of the easy ways to write complex LINQ queries in an easy and readable
format. The syntax for this type of query is very much similar to SQL Query. If you are
familiar with SQL queries then it is going to be easy for you to write LINQ queries using
this query syntax. The syntax is given below.
9. Method Syntax
Method syntax is increasingly popular for writing LINQ queries due to its use of lambda
expressions to define conditions. It excels at simple read-write operations but can be
challenging for complex queries. It involves chaining multiple methods with dots (.) for
query construction:-
10. Mixed Syntax
This is the combination of both Query and Method syntax. The syntax is given below.
11. LINQ Operator
The LINQ Operators are nothing but a set of extension methods that are used to write
LINQ Query. These LINQ extension methods provide lots of very useful features which we
can apply to the data source. Some of the features are filtering the data, sorting the
data, grouping the data, etc.
In LINQ, the operators are divided into the following categories:
Ordering Operator
Grouping Operator
Filtering Operator etc.
