by Syncfusion
What is LINQ?
Language-Integrated Query is a feature in C# for querying and manipulating data collections. It introduces a declarative syntax, making it easier to write data-oriented code.
What are the different types of LINQ?
· LINQ to Objects: Queries in- memory collections. · LINQ to SQL: Queries relational databases using a LINQ-based syntax. · LINQ to XML: Queries XML documents. · LINQ to Entities: Queries data using the Entity Framework.
There are several types of LINQ:
Explain the difference between Select() and SelectMany().
Select(): Projects each element in a sequence to a new element. SelectMany(): Projects each element in a sequence to an IEnumerable<T> and flattens the resulting sequences into one.
What is deferred execution in LINQ?
Deferred execution means that a LINQ query is not executed until its result is actually needed. This allows for optimization and lazy evaluation.
How do you perform joins in LINQ?
LINQ provides two main ways to perform joins: Join(): For one-to-one relationships. GroupJoin(): For one-to-many relationships.
What is the Where() clause used for?
The Where() clause is used to filter elements in a sequence based on a condition.
What is the OrderBy() clause used for?
The OrderBy() clause is used to sort elements in a sequence. See the example code below,
How can you create custom LINQ operators?
You can create custom LINQ operators using extension methods.
What is the difference between FirstOrDefault() and SingleOrDefault()?
FirstOrDefault(): Returns the first element in the sequence or the default value if the sequence is empty. SingleOrDefault(): Throws an exception if there are multiple elements or no elements in the sequence.
How can you optimize LINQ queries for performance?
· Avoid unnecessary iterations. · Use indexes when querying databases. · Consider deferred execution. · Use parallel LINQ (PLINQ) for large data sets.
by Syncfusion
Follow us on:
For more information, visit