Language-Integrated Query (LINQ)
is the name for a set of technologies based on the integration of query capabilities directly into the C# language.
The LINQ provides a clear and consistent way to query objects , relational databases and XML.
Contents
LINQ Methods
Any
There are two ways of expressing LINQ:
Query Syntax: is similar to structured query language(SQL) for databases.
It begins with From keyword and ends with Select or Group By clause.
2.Method /fluent syntax: Comprises of extension methods and lamba expressions . The extension Methods are included in the Enumerable and Queryable classes.
The query syntax is converted to method syntax at compile time.
Note :
LINQ does not directly modify data it provides a way to query and transform data such as filtering, sorting, and ordering.
This article will focus on using method syntax.
LINQ Methods
There are several LINQ Methods:
This type determines whether the defined collection contains any of the elements defined and returns a boolean. True if any of the elements pass the test otherwise false.
Example 1:list of Names.
using System.Collections.Generic;
using System.Linq;
public class LinQ
{
public static void Main()
{
IList<string> Names = new List<string> { “John“, “James“, “Kevin“, “Joan“ };
var isNameContainsJohn = Names.Any(name => name == “John“);
var isNames = Names.Any();
Console.WriteLine($“ Name contains John -> {isNameContainsJohn}“);
Console.WriteLine($“Does Names Contain any Elements -> {isNames}“);
}
}
> Name contains John -> True
> Does Names Contain any Elements -> True
Example 2: List of Numbers
using System.Collections.Generic;
using System.Linq;
public class LinQ
{
public static void Main()
{
IList<int> Numbers = new List<int>{1,2,4,5,6,7};
var isAnyNumberGreaterThan10 = Numbers.Any(Num => Num>10);
Console.WriteLine($“Is Any NumberGreaterThan10 -> {isAnyNumberGreaterThan10}“);
}
}
>Is Any NumberGreaterThan10 -> False
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