LINQ Interview QuestionsWhat is LINQ?Explain the main benefits of LINQWhat are the different types of LINQ?What is the difference between LINQ to Objects and LINQ to SQL?What are different methods to write LINQ Query in C#?Explain the concept of deferred loading in LINQ to SQL.What is eager loading in LINQ?What is lazy loading in LINQ?Can you disable lazy/deferred loading?What is explicit loading in LINQ?What is IQueryable in LINQ?What is the difference between IQueryable and IEnumerable?What are lambda expressions in LINQ?What is Can we use ref and out paramters in lambda expression? if declared outside?What is LINQ provider and explain different types of LINQ providers?What are advantages of LINQ over DataSet?What is the difference between LINQ and stored procedures?What are the disadvantages of LINQ over stored procedure?Difference between ADO.Net and LINQ to SQL?How can you handle concurrency in LINQ to SQL?How can you handle concurrency at field level in LINQ to SQL?What is the purpose of "Any" operator in LINQ?What is the purpose of "All" operator in LINQ?What is the difference between "Any" and "All" operators in LINQ?What is the purpose of "Contains" operator in LINQ?What is the difference between "Any" and "Contains" operators in LINQ?What is the purpose of "Count" operator in LINQ?What is the purpose of "Min" operator in LINQ?What is the purpose of "Max" operator in LINQ?What is the purpose of "Sum" operator in LINQ?What is the purpose of "Average" operator in LINQ?What is the purpose of "ToList" operator in LINQ?What is the purpose of "ToArray" operator in LINQ?What is the difference between "ToList" and "ToArray" methods in LINQ?What is the purpose of "ToDictionary" operator in LINQ?What is the purpose of "ToLookup" operator in LINQ?What is the purpose of "Cast" operator in LINQ?What is the purpose of "First" operator in LINQ?What is the purpose of "FirstOrDefault" operator in LINQ?What is the difference between First and FirstOrDefault in LINQ?What is the purpose of "Single" operator in LINQ?What is the purpose of "SingleOrDefault" operator in LINQ?What is the difference between "Single" and "SingleOrDefault" in LINQ?What is the purpose of "Last" operator in LINQ?What is the purpose of "LastOrDefault" operator in LINQ?What is the difference between "Last" and "LastOrDefault" in LINQ?What is the purpose of "Where" operator in LINQ?What is the use of "Select" operator in LINQ?When to use "SelectMany" operator in LINQ?What is the difference between "Select" and "SelectMany" in LINQ?What is the purpose of "OrderBy" clause in LINQ?What is the purpose of "GroupBy" clause in LINQ?What is the usage of "Having" clause in LINQ?What is the purpose of "Distinct" method in LINQ?How do you use the "Distinct" method with a custom equality comparer in LINQ?What is the purpose of "Concat" method in LINQ?What is the purpose of "Skip" method in LINQ?What is the purpose of "Take" method in LINQ?
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What are lambda expressions in LINQ?

Lambda expressions in LINQ are concise and anonymous functions that allow you to write inline, short, and reusable code for data manipulation. These expressions are used to define functions without explicitly specifying a method or a delegate type. Lambda expressions consist of two main elements: parameters and a body.

A lambda expression consists of the following elements:

  1. Lambda Operator (=>): It separates the lambda parameters from the lambda body. The lambda operator reads as "goes to" or "becomes."
  2. Lambda Parameters: These are the input parameters of the lambda expression. They can be explicitly typed or implicitly inferred by the compiler. Multiple parameters are separated by commas and enclosed in parentheses if there are more than one.
  3. Lambda Body: It represents the logic or expression to be executed. It can be a single statement or a block of statements enclosed in curly braces. The body can return a value or perform an action.
Here's a simple example of a lambda expression in LINQ: 

using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // Sample list of numbers
        List numbers = new List { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

        // Using a lambda expression in LINQ to find even numbers
        var evenNumbers = numbers.Where(n => n % 2 == 0);

        // Output the even numbers
        Console.WriteLine("Even Numbers:");
        foreach (var num in evenNumbers)
        {
            Console.WriteLine(num);
        }
    }
}

In this code:

  • We define a list of numbers from 1 to 10.
  • We use a lambda expression within the Where method of LINQ to filter even numbers from the list.
  • The lambda expression n => n % 2 == 0 has a single parameter n and a body that checks if n is even (i.e., divisible by 2).

When you run this code, the output will be: 


Even Numbers:
2
4
6
8
10

This output demonstrates how a lambda expression is used within a LINQ query to filter and retrieve even numbers from a list. Lambda expressions in LINQ make it easy to write concise and expressive code for data manipulation tasks.

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