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?
Previous
Next

What is the use of "Where" operator in LINQ?

The Where operator in LINQ is used to filter a sequence (collection) based on a specified condition. It allows you to extract elements from a sequence that satisfy a given predicate or condition.

Here's the syntax of the Where operator in LINQ: 


IEnumerable<TSource> result = sequence.Where(predicate);
  • sequence represents the collection or sequence of elements from which you want to filter.
  • predicate is a lambda expression or delegate that defines the condition for filtering the elements.

Example: 


int[] numbers = { 1, 2, 3, 4, 5 };

IEnumerable<int> evenNumbers = numbers.Where(num => num % 2 == 0);

In this example, the Where operator is used to filter the numbers array and retrieve only the even numbers. The operator takes a lambda expression num => num % 2 == 0 as a parameter, which defines the condition for selecting the elements. The resulting evenNumbers variable will contain the sequence {2, 4}.

The Where operator has the following characteristics:

  1. It applies the specified condition to each element in the sequence and returns a new sequence that includes only the elements that satisfy the condition.
  2. The condition is defined using a lambda expression or delegate that takes an element as input and returns a Boolean value indicating whether the element should be included in the result.
  3. The result of the Where operator is an IEnumerable<TSource> that represents the filtered sequence.

The Where operator is useful when you want to extract elements from a sequence based on a specific condition. It allows you to perform powerful filtering operations on collections, selecting only the elements that meet the desired criteria.

Previous
Next